WuKong Air Conditioner Smart Controller

7 January 2016

tinyurl:  https://tinyurl.com/y836bbko

Introduction

Air conditioner is no longer a luxury but a household item in Today’s Singapore.  Most air conditioners nowadays have a simple controller with limited functions;  also,  these controllers are of a manual type and not intelligent.   The intelligent ones,  called smart controllers, will learn the control codes of existing air conditioners and allow users to control the air conditioner either through a set of pre-defined or customized programs or control strategies for comfort cooling as well as for energy conservation.

Types and Brands

There are several types of smart controllers available in today’s market.  The common ones are WukongI8 made in China,  Tado made in Germany and Ambi Climate made in Japan.   This article will examine only WukongI8.  

What is WukongI8?

WukongI8 is a smart air conditioning remote control that is designed and manufactured by a Chinese Company called “Gallaxy Wind”.  It is retailed at around RMB129/= for a standard model that controls only air conditioners and RMB190 for a model that will also control TVs and other devices such as lighting.  One can buy WukongI8 from TaoBao.

How WukongI8 Can Make  Air Conditioner Smarter?

WukongI8 is a smart controller.  It has a  set of independent built-in temperature and lighting sensors,  a microphone, and standard programs that can automatically turn on the air conditioner at 9:00 pm, for example,   lower the fan speed at 10:00 pm;  thereafter,  increase the room temperature by 2 degrees C in order to save energy.      

WukongI8 can also be programmed to run at other combinations with a different control strategy.  It has also a built-in energy monitoring recording device where users can use to monitor the energy usage of each control strategy and pick the right strategy.     

As WukongI8 is linked to the handphones through an internet connection,  the user can therefore program and control the air conditioner from anywhere around the Globe provided there is an internet connection.  There is no hard wiring connection between the air conditioner and WukongI8.  Connection to Router/Internet is through WiFi links.    

What are the Specifications?

Power Supply Input：85~240V AC

Power Supply Output：85~240V AC

Frequency：50/60Hz

WiFi:  WiFi2.4GHz b/g/n

Standby Power: ＜2W

Maximum Load：3500W

Maximum Current：16A –Australia/China grounded  AS3112

Andriod & iPhone software:  Andriod  2.3.7 or  iOS 7.0 and above

Official Warranty:  1 year

Firmware update:  free

What are the Basic Control Capabilities?

Besides the basic function of performing as a standard remote control,  WukongI8 can also perform the following additional functions

1. Has presets to turn on and off at air conditioner in 20-time segments
2. Automatically turns on the Air conditioner to cool room temperature to 24C when room temperature exceeded 30C.  It has also control strategies for heating functions;
3. Measures and logs the energy consumption of the air conditioner  giving aggregated yearly,  monthly, and daily energy usage
 

It has various pre-designed control strategies,  such as auto-cooling,  profile cooling,  auto sleep cooling etc;

Using the phone’s GPS system,  WukongI8 is able to tell if the user is carrying out the control at home or outstations and choose the desired control program.

What is the type of air conditioners that can use WukongI8?

 

WukongI8 can only work with air conditioners that have an infra-red remote controller having an LCD screen.  WukongI8 cannot work with radio frequency, remote controllers.  

How to Install? 

 

Installation is simple and straightforward.  Just plug in WukongI8 in series with air conditioner if one's air conditioner is connected to a  powerpoint nearby.   

However,  most split air conditioners in Singapore are remotely connected to a 15A socket outlet and therefore,  one would have the following two options:

1.    Extend the power to connect WukongI8 and locate WukongI8 within 5 meters from the fan coil unit;

2.    Rewire the power to the air conditioner so that the power to the air conditioner can be drawn from WukongI8’s 16A power socket. 

Note: As Wukong uses Chinese 16A power socket format,  one would have to use proper 16A socket outlets which can be ordered from Taobao 

As infra-red communication will need the transmitters and receivers to be able to “see” each other,  it is, therefore, a requirement for WukongI8 to be installed directly opposite the air conditioner.  However,  WukongI8 could also work to a distance of 6 meters at an acute angle of not more than 50 degrees.  

Can I install Wukong Separately?

 

Wukong can work separately without the air conditioner’s power  drawing from Wukong’s 16 A power socket but it will not be able to record and monitor the power usage

What will happen on the Connection of Wukong?

Once WukongI8 is physically connected up to a power supply,  it will scan the room for an air conditioner to learn the control codes and connect WukongI8 automatically to the air conditioner through the infra-red transmitter/receiver.  Upon successful connection,  the blue light of WukongI8 will turn on;  otherwise,  the lights will turn red,  indicating the loss of signal connection. 

The original remote controller of the air conditioner will still work and will override and bypass the controls of Wukong. 

How Do I Control Wukong?  

To control Wukong,  the user must 

1.    Download the handphone Apps,  called Wukong Home from Google Playstore.  https://play.google.com/store/apps/details?id=com.gwcd.airplugor download and register Weixin first as a user and then  use its QR code reader to scan the code on WukongI8

2.    On the first successful download,  the handphone will search for the presence of WukongI8 and retrieve its Ids for a user to set up the Apps  with a password; after that

3.    WukongI8 will scan the room for a compatible device,  learn the infra-red control code, and connect to the air conditioner'scontrol

4.      Once the connection is successful,  a familiar screen will appear and one can use the handphone to control the various basic functions of the air conditioner

From this page,  one can navigate to set the basics parameters such as languages,  Centigrade/Fahrenheit, and other parameters

  

On other pages,  one could manually check and control the various functions of the air conditioner such as temperature,  fan speeds & swings,  timer etc

On selection of the Smart Mode,  one would be presented with various control strategies to control the workings of the air conditioner as shown,  from constant cooling to temperature profile cooling,  night cooling,  auto cooling, etc.  By selecting the "details",   Wukong will give a description of the strategy.   

Wukong also provides a graphical plot for temperatures of the room for the last 24 hours

The Useful Functions

1.  Temperature Curve

This will allow users to set the hourly temperatures with a preset range so that one could have a lower temperature before sleep for example and then turn up the temperature in the middle of the night etc.  This temperature curve setting will be over-ride when the original air conditioner's controller is used.

 2.  Auto-Sleep Function

This function will lower the fan speed and also lower the set temperature by 2 C if the room temperature is above 28 C. 

What is  Inside WukongI8?

1.  Opening up WukongI8

1. Remove the front panel which is held onto the casing by glue
2. One will expose the components such as infra-red receiver,  temperature and lighting sensors and also the microphone

3. The controlling  unit can then be removed as shown

4. The controlling unit consists of the following components attached in the back of the unit

a)      The power supply unit

b)      The WiFi Board  and the EEPROM

c)      The Main Control Board

d)     The Power Output connection

Performance and Energy Savings

It is hard to compare the performance with and without Wukong operating as we have also bed cooler in operation at the same time.  

An energy data acquisition instrument was used to measure the consumption of the air conditioner together with the bed cooler over a period of 1 month for various combinations.  They drew about 2.5 KW  to about 5 KW depending on the setting of the Wukong.  Generally,  the various measurements can be divided into 5 categories

1. Power cooling for 3 hrs @ 26C without Bed Cooler and Wukong
2. Wukong Auto Sleep Mode without Bed Cooler
3. Wukong Auto Sleep Mode with Bed Cooler
4. Power Cooling for 3 hours @ 27C with Bed cooler but without Wukong
5. Wukong Temperature Curve with temperature setting between 26 to 28C with bed cooler

Note:  Power Cooling is a feature of Panasonic air conditioner which lowers the room temperature setting by 2C with higher fan speed

It has been found that Wukong has helped to save about 26% of the energy consumption.   With bed cooler and Wukong working in combination,  a further 13% energy could be saved with comfort cooling for a good night's sleep.

Note: The bed cooler was set to 29C which required the air conditioner to operate at lower than normal temperature and therefore,  consumes more energy.  More energy could be saved by setting bed cooler at temperatures lower than 29C.

 Conclusion

It is expected that more such devices will flood the market in the future as more people learned how to use the smart controller.  It is also expected that pretty soon,  the smart controlling device will become a standard item in the new air conditioners. 

Appendix I:  Suggestions to Improve Wukong

1. Temperature Curve to be set according to startup hours instead of the hourly clock

Presently,  the curve is set to the hourly clock.  The air conditioner will start at preset hour irrespective if one needs the air conditioning.  This leads to unnecessary wastage of energy.  For example,  if one were to preset 28C at 11:00 pm,  one would have to re-adjust the setting to the desired temperature when one starts the air conditioner at 11:00 pm.  A refinement would be to allow the temperature curve to be set according to when the air conditioner is turned on.  

2.  To prevent the Temperature Curve to be turned on automatically,  one would have to turn off the temperature curve setting every day and then turn the air conditioner from there;  otherwise, Wukong will not work properly.

  

Appendix II :  FAQ

1.  Can we use WukongI8 in an old air conditioner?

So long as the remote control is of the infra-red type that has temperature,  fans and other controls.  If the air conditioner can use universal remote control,  most likely there will be no problem.

2、Can I use it for Package unit air conditioner?

            Not supported

3、Can WukongI8 control other appliances?

Not supported

4、Can the APPs be shared among family members?

Yes

5、We don’t have WiFi at home

WukongI8 must work with WIFI router

6、What’s the  Wifi Speed?

2.4Ghz。

7、Any distance limitations?

Not for the handphone’s WIFI control as it uses the internet which can even control from overseas;  however,  WukongI8 must be installed as close as possible to the air conditioner.  Rightly speaking,  the infrared sensors of the air conditioner and WukongI8 should  "see" one another;  however,  depending on the color of the walls and ceiling,  the author has tried that one can still have adequate control receptions up to 6 meters at an acute angle of not more than 50 degree.

8、What is different between Weixin and the standard model?

The standard model does not have the Weixin function but the WukongI8  home App is useable for both models。

9、What is the handphone requirements?

Andriod 2.3.7or iOS 7.0 and above

10、Where can I download the WukongI8 Apps？

Use Weixin to scan the QR code on the box or unit or download directly from Google playstore. 

11、Why socket-outlet is 16A？

That is the standard outlet rating for air conditioners in China. Singapore uses 15A.

12、Ease to install？

As described in the blog。

13     We use a Universal remote controller？

Should be compatible with WukongI8. 

14、Can we still use the normal remote control?

Yes.

15、If I lost the password for WukongI8 home？

Reinstall WukongI8 with a new password。

16、What capacity air conditioner？

3 horsepower (HP) or less or not drawing more than 3500W.

17、What if our remote control is not working?

Try Universal remote control.  If it is still not working,  most likely the air conditioner remote control is faulty

180、Does WukongI8 works with other remote controllers?

It will not work with radio remote controllers.  Most likely, this controller will have no LCD screen. 

tinyrul :  https://tinyurl.com/y836bbko

How to Reset a Gigabyte MotherBoard BIOS

18 July 2016

Introduction

Many users are aware that Gigabyte motherboard has two identical BIOS onboard;  one for operation and the other for backup.  May be due to having this redundancy,  the operating BIOS tends to be corrupted easily when there is a:

1. Hardware Failure e.g Faulty RAMs
2. Power shut down during BIOS update process
3. Improper Overclocking settings
4. Virus attack

What Happened After a BIOS Corruption?

PC will not start up properly.  It will either

1. start up with fans spinning and stopping soon  thereafter or continue to spin until the PC turns itself off and restart  or
2. start up but will enter into BIOS straightaway. Savings and Exits will not fix the problem. 
3. The screen may or may not start with a PC logo and then disappears with a blank screen 

There may be also other syndromes.

How to fix

There are 4 methods,  depending on the severity of the BIOS corruption

Method 1:  Power on and power off

1.   Shut off the power supply(by turning off the main switch). Wait for 10 seconds.
2.   Press and hold PC Power On button and then turn on  the power supply.
3.   Release the PC Power On button once the PC  starts. 
4.   Shut off the power supply as quickly as possible thereafter.  
5.   Turn the power supply back on 
6.   Start PC as usual using Power on button

Method 2: Resetting the BIOS

1. Shut off the power supply and wait 10 seconds 
2. Press PC Power on button  and PC Reset button all at the same time for about 10 seconds
3. Release the buttons thereafter and turn on the power supply on to start the PC as normal

Method 3: Resetting the CMOS

The mechanical method of method 2 except to apply the jumper or remove the CMOS battery to clear the CMOS settings This method may require the removal of the board as the jumper might be difficult to locate; the alternative is to remove the cmos battery and wait for 10-15 seconds for cmos setting to be cleared

Method 4: Force Backup BIOS to be restored

When the above 3 methods failed, this last trick should work if the backup BIOS is in order.  However,  this
method should be used only as last resort by experienced technician and at one's own risk

1. Remove the motherboard as this method cannot easily  be done with motherboard still in the case 
2. Hook up the power supply unit, the speaker cable (important to listen to the beep sound) and the monitor cable; remove all except the 1st row of RAMs 
3. Find a tweezer with very sharp pointers; sharpen it if necessary to make it as sharp as possible so as to short the pins of the BIOS chip as accurately as possible without damaging the motherboard
4. Carefully examine and locate the Main BIOS and the Backup BIOS. They are usually next to each other;
5. Find out where is pin#1 and pin#6 of the main BIOS (pin #1 should be marked with a red or white dot)
6. Practice several times to ensure that the tweezer will short only pin#1 and pin#6 and not other pins. Bend  the tweezer pointer  if necessary to span across pin#1 and pin#6.
7. Turn on the Power supply without pressing any button
8. Carefully apply the tweezer to short pin#1 and pin#6 firmly.
9. Press the power on button (get someone to help if necessary)
10. Remove the tweezer once there is a beep or multiple beep sound from the speaker.  The multiple beep sound usually caused by faulty RAMS.

Hopefully,  one should  be greeted with the Gigabyte splash screen, or POST page after this.  Follow the instructions to load the backup BIOS. 

If all the above methods fail,  consider to send the board for RMA.

Important Update 1:- 3 Aug 2016

If one is using the On-Board Graphic system

1. Please note that it may be necessary to use a separate graphic card that has already got drivers installed earlier in the PC.  This is because when the BIOS is corrupted and immediately after  a reset,   a start up screen will always appear with option for users to select the way to optimise the BIOS.    This startup screen will not be shown by on-board graphic system as the BIOS has not yet been set up.    .     

Update:  29 Sept 2018 

If the recovery of Bios were to fail,  it may be possible that the bios chip has expired.   The older Bios chip has a life of around 10 years after which the chip's memory can no longer be re-programmed.  The  newer ones has longer life of around 18 to 20 years.   The only way is to replace the chip and re-programme it by downloading the Bios from the manufacturer's website.

 

Changing Drive Numbers in XP, Windows 7,8,10

10 Jan 2016

What happen when one gets to the Windows'  Computer Management and wanted to change the drive letter  and one cannot find the available drive letter.   

Why?

The drive letter has been used by other devices.   When we plug in a thumb drive for example,  Windows will assign a drive letter and this letter is saved in the Windows' Registry.

How To Change?

There are always software available to overcome this problem.  The easiest way I found is to amend the drive letter inside the Windows' Registry.

Where in Windows' Registry?

1.   Startup by typing "regedit" in the search box of the start button and run "regedit" as an adminstrator

Expand HKEY_LOCAL_MACHINE/SYSTEM/MountedDevices.  A screen as follows will show up

 2.  Right click the disk letter you found and choose to rename the device to other drive letter.

The PC will only let release the drive letter after one has restarted the PC.

 

 

Fixing The National Step Challenge Tracker

20 December 2015

The Singapore Health Promotion Board gives out Actxa Stride step tracker at a nominal cost of SGD$5/= * to all Singaporeans who registered for the National Step Challenge.  At times,  the tracker will not work properly after cleaning it using water.   What shall we do ?  Throwing it away is one option,  how about fixing it?  
* it was free before 1 Dec.  The National Step Challenge is from 7 Novemer 2015 – 8 May 2016 

Why the Tracker Stop working?

The tracker is water resistant but not water proof.   Water might not get into the tracker through the weakest part,  that is the USB charging outlet.    

If one inspects the strap or the belt closely,  one can find that there is a stopper to prevent water penetration into the USB.  

But this stopper is not water proof.   Water can easily find its way into the circuit boards when the stopper or the strap is removed for cleaning.  Furthermore,  the tracker plastic cover is removable and therefore,  not water tight.

What to do Next?

Dry out tracker

Method 1

What’s required?

1. Hair dryer

2. A small package of rice

Dry out  the tracker.  Using hair dryer with “warm to touch” setting for at least 10 minutes.  This method might not  work if the water has penetrated deeper into the tracker.  In that case, leave the tracker covered with rice inside the package for about 1 week and let the rice extracts the  moisture out of the tracker.

Method 2

This method for technical savvy readers

What’s Required ?

1. WD40 and a tooth brush
2. Paper towel for cleaning
3.  Hair dryer

1. Open the tracker's plastic cover by working from the opposite end of the USB outlet,  using just finger nails or something such as a coin to pry open the cover.  One should expose the circuit board with a Lithium Battery attached to it by a pair of wires.  Observe the position and placement of the battery.   
2. Carefully remove the circuit board, making sure not to destroy the “soft sponge wiring  contact” that is attached to the touch button of the casing.

3. Try touching the shinning golden plate next to the display.  If the set is responding to the touch,  then the tracker is working;  otherwise,  the trouble is in the soft sponge wiring contact. Dry the sponge out carefully and thoroughly with the hair dryer for at least about 5 minutes and reassemble the tracker back to its original state*.

4. If the tracker just  does not work,  dry out any moisture that can be trapped inside components using hair dryer with “warm to touch” setting for at least about 10 minutes.
5. Spray some WD40 on to the tooth brush (but not directly to the circuit board as WD40 will spoil the display unit).  Apply the tooth brush all over the circuit board,  avoiding as much as possible,  not to touch the display unit
6. After that ,  dry the WD40  with the hair dryer.

The display should turn on and off after touching the shinning golden plate next to the display.   If there is no display after the cleaning,  try charging tracker as the battery* might be flat.   If all the above failed,  one has a faulty tracker.

      * the battery should be discharged completely before reassembled back to its original state

7. Assemble the unit in reverse order,  making sure the battery is the original position

Why the Tracker’s Touch Button does not respond ?

When the tracker is opened or dropped on the floor,  the button might not work properly or insensitive to touch.  But when one lifts up the tracker and read or touches the “shinning golden plate” of the circuit board,  the tracker works.  

Why?

The tracker button is capacitance type that sense the present of finger.  If for some reason,   the capacitance should change due to possible micro movement of the printed circuit board,  it might render the unit not possible to detect the present of the  finger.

How to Fix?

Resetting the tracker and let the tracker re-calibrate the capacitance on startup

How to Reset the Tracker when there is no other button?

If the tracker is working,  one can either reset the tracker by

a)     Try uninstall and reinstall the Health 365 software.  it should  reset and recalibrate the tracker;

b)   If that does not work,  try leaving the tracker alone for about a week and let the battery discharge completely;  after that,  recharge and start the tracker;
.

c)      If one is technical savvy,  open up the tracker and drain the battery out by using a 100 ohms     resistor connecting across the battery terminal.  The discharge time can be around 1 hour.  Do not short directly the terminals of the battery. Recharge the battery* and the touch button should work again.

* recharge only after assembling back with its plastic cover intact.

How do I know the Tracker has been Reset?

On the first charge,  the tracker should display “Hello” and followed by the battery charging sign.

Are There any other Simple Ways to Reset?

There might be other ways to reset the tracker such as using the reset pin of the microprocessor but the author could not identify any technical information about the microprocessor to try out the pins.

Duplicating Condominium Access Cards

17 December 2015

I lost my access card to my apartment the other day.  The management of the Condominium  wanted SGD$60/= for the replacement of the card and another $100/= as a deposit.  The market rate to duplicate a card ranges from $15/= to $33/=.  This article will give some basics about access card and where and how I duplicated my card.

The Basics

Most access cards used in Condominiums are for access through the main or side gate.  These cards are called “RFID” cards which stand for Radio Frequency (RF) ID Cards.   Embedded inside each card is a coil of thin wires and a microchip.  Most of these cards are passive type,  meaning there is no battery inside the card. 

 

When the card gets near a card reader,  the coil  will receive an RF signal from the card reader. This signal will not only power up the card but also activate the microchip inside the card to send a code to the card reader to open the gate for example.

Some of the cards are encrypted for additional security reason,  making them difficult to clone.  Fortunately or unfortunately,  most cards are simple cards that just stored an ordinary code for the card reader.

The simple ones will use a frequency of 125Khz as a transmitting carrier.  Some complicated ones that allowed codes to be encrypted are running at 13.56 Mhz which will allow more codes to be written to the cards.     

How to Duplicate EM Cards

1.  Non Encrypted EM Cards

These cards are  called “EM” cards as it was first developed by EM Microelectronic of Switzerland.  They are labelled EM4100 or EM4102 and they work only on 125Khz frequency. EM cards also operate at some other frequencies. 

2  What you will need to duplicate EM Cards?

      1. EM Card Reader Cum Writer (copier)

      2. EM card or EM tag

  

      One can purchase the EM card reader cum writer (copier) from vendors in AliExpress for about USD $15/=.  This EM copier also supports EM4205,4305 writable cards or tags as well as T5557,  T5567, T5577,  CET5200 and CET5577 cards as described in the  brochure.  The complete set comes with 6 credit card size EM cards and also 6 RFID tags as shown below.

 

The reading  and writing of the card is very simple as shown in the following video.

How To Identify Your Card?

Many cards do not give any clue about what type and model;  fortunately,  there is a simple way to find out because most card readers will have a brand name and sometimes,  if one is lucky,  also the  model number.  Surf the net to get the required information.

What if my RFID is not the same type as yours?

 Like any lock or key,  all access cards can be hacked and duplicated.  One only needs to surf the net and find a solution.  If one's card is  simply having a single purpose such as opening the door or main gate,  it might not be encrypted and one is likely to find similar tools to read and write the card.  A good tool to use is a 9 frequencies copier as shown here.

This tool will try to read almost any card and give a voice in English that will report something about the  card,  such as operating frequency or if it can read and write your card.

What if all the above does not work?

 One may try to purchase another more expensive and powerful copier  such as this shown here. 

 

According to the description,  the copier will display the read and write operations.  For access card that is encrypted,  this copier can also be hooked up to a PC in which a software provided will be able to analyse the card and help to identify and crack the code.  However,  the author has not tried this tool yet.

Are there other tools?

There are many other tools available in the market that can read and write the card but most of these other ones will require one to know how to use the software and do some programming in order to duplicate or break the code.

Can I use EM copier for copying HID cards?

 Not all copier can copy both EM and HID cards although they are of the same frequency.   HID cards are just cards that is manufactured by another company.  HID card has a more advance coding system,  enabling more secured codes to be written to the card.  It is always good to check with the vendor if one suspected that their access card has more advance features.  Copiers that can copy both EM and HID cards demand a slightly higher price.

Is EM4100 and EM4102  the same?

EM4100 and EM4102 are the same type of card except for EM4102,   being newer model,  has a unique chipset configuration that will  enable the card to be made thinner than EM4100.  Please note that EM4100 is not programmable.  One could try EM4305 or other series of compatible  RFID cards or tags.

What about other EM cards and other 125 Khz Cards?

EM cards are not necessary made for the same purpose and therefore,  they may differ from each other.   EM4100 are 64 bits read only card that once written,  cannot be rewritten.   The other card like EM 4205 and 4305 are 32 bits, whereas T5557 are 330 bits types that may not be compatible with EM4100.  On the other hand,  EM4200,  being replacement of EM4100/EM4102 EM4005/4105 claimed to be compatible with the latter.

Is it legal to copy access cards?

Under the  existing legal framework,  duplicating access cards is treated no difference to  duplicating normal keys.  There are many shops and outlets including those  reputable ones like  Mister Minit and  Soxxi Master are offering such duplicating services.

How to Back Up Windows’ Registry Permanently

11 December 2015

1.0  Introduction

Windows XP and other later Windows OS have built in restore function which one can save a copy of the PC’s registry and restore the PC to its previous condition should something go wrong with the OS.    Unfortunately,  this function can store and keep a copy of the registry provided one has allowed adequate storage; otherwise,  one would lost the earlier copies as they will be overwritten without any notification.   This article will provide a simple solution using a free software called “RegBak”. 

2.0    Where to Download

Can download from here  It has been used by many and no bug or virus has been reported. 

3.0    What is Required

3.1    Starting up

Install Regbak and fire up,  one should be greeted by this screen,  click NEXT   

   

It will bring to a confirmation and backup page where one can backup the registry into the designated folder

3.2    Restoring Registry (Using Windows 8 or 10 as example)

3.2.1    One can boot into Windows

Either in Safe mode or normal windows,  navigate to “Windows\regbak” folder and select the date.  Then click “REGRES.CMD”. Restart the PC.

3.2.2    One cannot boot into Windows

3.2.2.1 Windows 8,  8.1 or Windows 10

1)  Startup Windows Repair DVD.  Navigate to “Advance Option” and select “Command Prompt”.

2)      In the  Command Prompt,  type “D:” (without quotes;  same for all)  to change Directory to “D:” then type “cd windows\Regbak\” to navigate to the Regbak folder

3)      Open up the folder by typing “DIR/W” at the Command Prompt.  One should find the required backup folder,  for example “2010-10-23”

4)      Navigate to that backup folder by typing “cd 2010-10-23” and do another “DIR/W” to find the backup files, "REGRES.CMD"

5)      Type “REGRES.CMD” to run the program

6)      Restart the computer.

      

3.2.2.2 Windows 7 

When starting windows,  press space bar continuously and then press F8 as instructed until the follow screen shows up

 Click "Repair Your Computer",  follow the instructions until the following screen shows up

Click "Command Prompt" and following para 3.2.2.1  2)- 6) to restore the registry.

4.0  Safe Keeping of Backup Folder

      Safe keeping of the backup folder or files in another hard disk or a CD by copying the Regbak   folder and files from Windows\regbak folder.  In case of emergency repair,  just restore the Regbak folder and start the Registry restoration,  the PC will be back to its previous condition.

5.0  What will be missing?

This method of restoration will not be as powerful as Windows' system restore as it saves only a copy of the Registry. It will not check and restore missing programs for example. 

Unless one's PC is having hardware or disk problem, most likely one can restore your PC to its previous conditions without having to lose your files or information or reformat your drives except one cannot restore those programs or information that one has deleted from the drives.

 

Windows 10 Startup Problem After Changing Components

 27 November 2015

 Introduction

After one has changed some components in the computer with Windows 10,   one may encounter start up problem;  for example,  after changing the keyboard or mouse,  the keyboard or mouse will not work after startup and might just get hanged.   Do not panic,  this article will explain why and what you should do next

Why?

The OS has the “Fast Startup” function turned-on when you shutdown.  It saved the startup  data to a file called hiber.sys. When one starts Windows the next time,  it will simply load the startup data without verifying so as to speed up the starting.  Unfortunately,  the data of the new components one has just installed were not saved.

How To Regain Control?

1. Restart the computer,  this time select “restart”  instead of “shutdown”.  

But when one  changes keyboard or mouse, it might not be possible to select “restart”,  then

2. Enter into BIOS setup at startup (consult the manual,  usually press DEL or F2 key) ,  then select “Save and Exit”

Philips 170 S4 Monitor Repair

8 June 2015

Symptom

 This old 17” monitor  gave a blank white screen whenever it started.  Switching the main button on and off repeatedly or pulling the plug may reset the monitor but it will go back to white screen on next restart.  

What was wrong?

 A polyester capacitor labelled  as 0.47K275V-X2 (0.47 uf  shown as 2101 & 2102 220nf 275V in schematic diagram) has gone bad with only 2nf reading when it was removed for measurement.   Though not affecting the monitor screen greatly,  it was found that the 82 uf 450V electrolyte capacitor (2016 as shown in schematic diagram) has also gone bad.

How to detect faulty capacitors?

 Many capacitors have to be removed first from the circuit board and use a multi-meter such as the following to take a reading.

As this meter of mine has an upper range of 200uf,  capacitors higher than 200uf could only be measured by charging/discharging method using ohm meter.  A good capacitor will start with very low ohm and slowly increase to about 1000 ohms or thereabout.   

Ensure that the capacitor is always discharged before taking any measurement as the multimeter can be damaged easily by any electricity discharge.

Schematic Diagram of Power Board

This schematic diagram can be downloaded from here.

Reference

One of blogger's repair work 

TW64 Smart Bracelet

7 May 2015


There are many different types of smart bracelets in the market.  The most common ones are branded under Fitbit,  Garmin,  Xiaomi but the most popular one appears to be a brandless bracelet called TW64.

What is a Smart Bracelet? 

Smart bracelet is nothing but an electronic counter that can be connected to the handphone and/or computer through a Bluetooth network for data logging. Various brands have come up with different functions  for such  bracelets.  Most use it to count the number of walking steps.  Others use the counter to work out calories consumed,   sleeping movements,  time alarms etc.  Many bracelets have a built-in time clock enabling the bracelet to be used also as a watch.   The more sophisticated ones like FitBit has in-built a height sensor,  enabling proper logging of step countings,  up and down a staircase.

What's Good About Smart Bracelet? 

1.  It takes record of your foot step, It will always help you to "challenge" your own self that you can always make longer and longer walk.   The recommended daily walking step is 10,000 steps for a healthy person according to American medical research institutions.  Once one has taken exercising to be a daily routine and walk or run  10,000 steps,  one would feel very uneasy to stop walking

2.  If the bracelet counting is website based, it will enable your bracelet to be "monitored" by the vendor like FitBit.  One might be able to use the records to get premium discount from some Health Insurance Companies.

What is TW64 and why it is popular? 

TW64 has been marketed under several brand names.  It has a twin 64K RAM and a 64K ROM all inside a Quintic 2021 system-on-microprocessor chip (SOC) which consumes ultra low power.  The abbrev "TW" could stand for the word TWIN.  TW64 is popular because it is one of the most affordable bracelet that has almost every function of the more expensive cousins.      

What are the main functions?

1. A 24 hours clock with running dates and a battery counter
2. A pedometer that registers walking step counting which is used to calculate the distance traveled and the calories burnt.
3. Other functions such as vibration reminder,  alarms,  sleep monitoring etc

Construction 

The chip,  Quintic 9021,  is enclosed inside a plastic casing measuring about 17mmx40mmx10mm.  The back case can be easily removed by 4 small screws to expose the inside electronic as shown.  Unlike other bracelets  it  allows the battery to be replaced.

Synchronising 

Like any other smart bracelet,  one can synchronise TW64 to the Android or Apple handphones through bluetooth using a free software called "MOVNOW plus", downloadable from Google Playstore or Apple Store.    Unlike Fitbit or other more sophisticated smart bracelet,   MOVNOW is not web-based and therefore,  could only be synchronised using handphones.

Performance 

The TW64 was tested with a full charge and compared it against a Fitbit Flex by wearing them together on the same wrist as shown.

The sets are then taken for a 6 km walk and the results are compared as shown

It can be seen that TW64 and Fitbit Flex have quite similar step counting.  It is well within the 10% error range.

The Battery and capacity 

The battery is a lithium-ion polymer type of either 40mAH or 60 mAH capacity. The test set came with a 60mAH battery and the vendor claimed it is able to handle  at least 7 days usage and 100 days standby.  After 5 days’ testing,  the test set still have 3/5 of the charge as indicated by the battery indicator.

Pros and Cons

Pros

1. It is very affordable,  priced around SGD$20/= including shipping from Q0010
2. It is not bad looking.  The bracelet material feels like silicone and has a look like FitBit Charge or other more sophisticated and expensive model
3. Long lasting battery that can be used for 7 days or more on a 60 mAH battery
4. Can be used as a watch
5. The battery is replaceable
6. Can be used without the handphone

Cons

1. The software is not web-based and therefore,  the data loggings or recordings might not be accepted by Health Insurance company for any discount in health premiums
2. The vibrator is soft and the vibration might not wake up some heavy sleeper ;  moreover,  the wake up alarm will sound only once.
3. It is only splash proof;  meaning,  cannot be worn for swimming.
4. Must synchronise to the phone regularly or the data would be lost. However,  the bracelet can store some data over nights for next synchronisation.

Things to watch out when buying TW64 

1. There are many brands offering various model of TW64.  Some are older model that can only used for older Android phones or iphones that have Bluetooth of 3.0 or lower
2. Go for TW64 which has 60 mAH battery as the battery will last longer. 

Things to watch out when using TW64 

1. The weakest part is the 3 charging contacts.  Clean them every time with a paper tissue after each long walk to get rid of the sweat.

1. Do not wear it for swimming though there is no problem wearing it during showers.  
2.  

QN902X Application Notes

The application notes on QN902X can be found here. 

Instantaneous Heater – Electrocution in the Shower

2 September 2014

There was a report that a Singapore teen was found dead while taking a shower. It was not immediately known if he was electrocuted or just scared to death as an electrical outlet that was connected to the instantaneous heater was shown charred in this picture.

Observation

There was no further report on the death but it was said the family just replaced the instantaneous heater themselves. They found the boy dead, lying on the floor when they forced open the bathroom door after hearing the boy's screaming. The resuscitation did not help the poor child.

The picture showed that the heater wires, run on ordinary 3 core cable, might be directly connected directly to a heater switch which could have burnt out.  This did not quite indicate the boy was electrocuted.

The heater switch is also not a common one that use double-gang socket outlet box. The picture also shows that the house wiring is a very old type with exposed wirings running on the surface using wood battens. This sort of wiring type is only found in very old HDB flats or perhaps in SIT flats that have never been replaced. But this flat in Block 1 Hougang Avenue 3 is a HDB 3 room improved unit which was built in the 70/80.

It was also reported that the socket outlet box was installed inside the bath room.  This is not allowed under the present electricity codes in Singapore.

What could be wrong?

There may be many reasons causing the boy’s death. It is not known until the investigation has been completed.

But from the picture, it may be clear that the wirings and system was not a typical installation in HDB’s flat built in the 70/80. This suggests that the owner could have re-wired the installation.

PUB, the former utility board, made the installation of earth leakage circuit breaker (ELCB) a mandatory requirement for every new residency electrical installation in the 70s.

If the boy has been caused by electrocution, it may be highly possible that either the ELCB is not working properly or the re-wiring of the apartment has removed the ELCB.

What is an ELCB?

An earth leakage circuit breaker (ELCB) is an electrical switch that can sense current flow or leakage of electricity and trip the main switch to the apartment before anything damage could happen.

Most Singaporean homes are installed with such ELCB that can trip when the earth leakage is more than 30 milli-amperes.

In the past, the ELCB must have saved many innocent lives. If it is true about the electrocution,  this poor boy would have been saved if the ELCB had worked and trip the electrical supply.

Could it be a failed ELCB?

The ELCB could fail to operate because it is basically an electro-magnetic switch with mechanism that might get stuck in the closed position during operation. It is for this reason that all ELCB will have a test button.

Testing of ELCB should be done regularly. The best is once a month. This is because ELCB or the main switch board are often enclosed somewhere out of view and may subject to all sort of environmental exposures including possible moisture attacks,  rusting the mechanism.

Besides Testing ELCB, what can be done?

One could ensure always that electrical appliances are connected to the earth so that if there is any electrical leakage to earth from the appliance, it will first trip the electrical main before any human could touch them; also, if there is any human contact, the current created will have enough power to trip the ELCB.

How to ensure there is a proper earthing?

Invest in a multi-tester that would cost not more than SGD$30 from most electronic shops.  The meter is also available from many $2/= neighbourhood shops with a separate price tag.

Set the tester to the lowest ohmic range, say 1 to 100 ohm. Using one test lead touching the metal part of the appliance, the other test lead touching any metal part of the water pipe or tap. The meter should show some readings around 10 ohms and below. If it is more than 50 ohms, most likely one would have a faulty earthing requiring attention or rectification.

In the case of instantaneous heater, using one lead touching the metal part of the piping connector of the shower head and the other lead touching directly to the water facet that is connected to water heater.    

In case where instantaneous heater has a PVC outlet connector that does not expose the metal part of the heater such as those shown here having an insulated PVC connectors,  carry out as follows:

First, switch off the power supply, then remove the outer protective casing of the heater (usually fixed onto the heater with a bottom screw). Using one cable lead touching the metal boiler unit or any other metal part and the other lead touching the water facet directly.   When fixing back the casing, make sure it is fixing back to the original position.

Why test cable must touch water pipe or facet?

It is a mandatory requirement in Singapore that all wiring installations must have their earthing bonded to the water piping at the incoming mains.

By having one lead touching the metal part of the appliance and the other lead to the water pipe or facet, one can test roughly the integrity of the earthing system within the apartment.

If the earth readings are more than 10 ohms, it is good to check the earthing of the appliance or the actual electricity earth for safety sake.

The electrical installations in Singapore are always installed with an effective earthing resistance having less than 1 ohm.  There should be test reports submitted to the authority.

What if the water piping has a section consisted of PVC?

Water pipings are mainly metal pipes but sometimes, a section of PVC may be inserted. It may give false reading especially when there is no water in the pipes. If there is water, the multi-ohm meter should still give some good readings because water is electricity conductive. If there is any doubt about the integrity of the earthing, place the test lead to the water pipe before the PVC section.

What if the Ohmic reading is Still high?

Try pulling a power extension cord that has an earthing connector from the nearest power socket outlet  to somewhere nearer to the heater and measure the resistance between the extension cord's earth and the heater's earth.   If the reading is still high,  there is a poor earthing connection to the heater and one should call an electrician to fix the problem immediately.   This high resistance readings could be caused by the Teflon plumbing tape being used to seal the  pipe joints of metal pipes especially when there is a repair on the existing piping system.

Update 1:   2 Sept 2014

This picture showed clearly the heater was connected to a 3 pin plug.   Understand the switch socket outlet of a double gang type was removed by the Police for investigation.  This switch socket outlet, installed outside the bath room,  was connected to the supply using another 3 core cable.  The wiring is an illegal addition according to the local codes which required all fixed wiring (e.g onto the walls) must be carried by licensed electrical worker e.g. an electrician and proper wiring method consisted of conduits or trunking should be used.  No flexible cables should be used.

What can I do if the house does not have an ELCB installed?

The Electricity ACT 1974 mandates the installation of ELCB in all new apartments including HDB flats.  Those built before this date might not have ELCB installed as a standard.  One should install the ELCB immediately for these electrical installation at the main switch panel.  It may cost around SGD $200/= including labour but it will save some life. 
However,  one could also install power socket extension plug with ELCB protection.  In such case,  it is better to check if the power socket extension plug has proper testing certificate from recognised institutions.  This extension plug might not be cheap.

Update:  The Coroner's court 

The Coroner's court in March 2015 found that the boy could have come into contact with an electrically energised metallic shower outlet hose that was attached to a water heater.   The court added that the boy's father installed the water heater about three months earlier. The simple installation work did not fulfil the strict definition of 'electric works' regulated by the Energy Market Authority.

http://www.straitstimes.com/singapore/courts-crime/teenager-electrocuted-in-shower-died-of-misadventure-coroner-finds

27 March 2017

 Installing New Instantaneous Water Heaters


1.  Never trust anyone whosoever install the electric instantaneous water heater for you. Even if it is a qualified electrician or LEW, they might make mistakes.   He may also be color-blind making wrong wirings;

2.  Make sure you see that person who install the water heater test the earthing system in your present. If possible, ask the person to perform a earth leakage test using method just described to ensure that your house's earth leakage circuit break (ELCB) or residue current circuit breaker (RCCB) is working properly;

3.  Also make sure the water heater has PSB/SPRING – Singapore or approved testing label.