Some new stuff
  1. Arduino Park Control
  2. Arduino USB2serial programming the bare bone
  3. Arduino Projects Videos added
  4. Arduino Xbee projects
  5. Arduino dB Meter 
  6. Trying to get the IOIO going. 
  7. IOIO is going....bluetooth
  8. Attiny 2313 bluetooth bee RC car
  9. Compass and temperature added
  10. AVR programmer
  11. USB2Serial and Ethernet POE
  12. Arduino LPG Sensor
  13. Program the Arduino Mini 05
  14. Lipo Rider Pro in action
  15. EZ Robot Builder kit arrived 10 Nov 2012
  16. Arduino VA Meter!
  17. 05 Nov 2012 Project Sentry Gun.
  18. Attiny85 PIR Sensor 10 Dec 2012 
  19. 0-30VDC3A and 2-28VDC10A bench PSU's
  20. 19 Dec 2012 Arduino Voltmeter LCD
  21. 29 Dec 2012 Arduino Tachometer&Speedometer LCD
  22. 03 Jan 2013 Arduino AC Phase Control. 
  23. 18 Jan 2013 Arduino Distance Meter
  24. 22 Jan 2013 Arduino Digital Clock and Date
  25. 31 Jan 2013 Arduino Digital Clock and Date 8x2 LCD
  26. Feb 2013 LCD and Backpack
  27. Feb 2013 7 Segment Serial Clock Sparkfun. Distance Sensor with "newping" library
  28. Feb 2013 Lelo Remote
  29. 01/03/2013 Arduino Adafruit 7 Seg Digital Clock with RTC and backpack 
  30. Arduino Frequency Meter 26/03/2013
  31. Another RC  Car controlled by Arduino 06/04/2013
  32. My quadcopter project update 25 April 2013
  33. My Aqua Quad Copter Flying 26 April 2013enlightened
  34. Another monster RC truck;strong one! 11July2013cool
  35. X-Frame Quad Copter 31 July 2013cool
  36. Arduino GSM Sheild added.28/8/2013
  37. 1.8inch TFT screen 13/09/2013cool
  38. 04/11/2014 added PID Soldering Iron Control
  39. Added bluetooth servo control 04/11/2014
  40. ESP8266 first try.16/03/2015
  41. Arduino Uno Quadcopter 19 May 2015
  42. IOT WemosD1 Amp Meter



I have built this buck booster (step down), to replace the traditional method of lower regulated voltages with the known 7805, 7806 series. We all know the energy loss with those items when you want to supply 6v from 12v regarding a servo motor for an e.g.

Buck booster step up

I want to be careful not to declare this a full tutorial on how to get the blue tooth bee ready for operation, but it took me more than a week to figure out how to manage the Seedstudio blue tooth bee. I am totally a newbie and cant code at all. But I tell you that the blue tooth bee information totally confused me, hence this effort to write something for dummies like me.

I wanted to get the blue tooth bee ready to use with my arduino controlled RC motorcar.

Initially I had Schalk from www.house4hack to my assistance to set up my firtst blue tooth bee. But then I toasted the blue tooth bee by supplying the item with  9 volts!!! Not good!

So with my second blue tooth bee, I really wanted to do this on my own and I decided to make use of the sparkfun explorer usb board. This item plugs and play to say. This was the best ever hint from house4hack (Schalk) and it payed off!

With this board plugged into the usb port of my laptop, I then opened arduino IDE, Samples, Software serial. But, after a long struggle and overwhelming of wikipedia  blue tooth setup information (commands for NORMAL operation versus commands to change default configuration), I changed the baud speed in the code to 38400. Why, because the bee is default on 38400. Then I opened the serial monitor and changed the baud speed setting 38400 as well in the monitor. Then I changed the serial monitor to "new line and CR". This I learned from Schalk too. I understand that any arduino code can be active on the IDE, because it is all about the serial communication you need to configure, but nevertheless I felt comfortable with the sample software serial. All I know is that I only know enough to know that I know nothing

And then lastly I first entered (click the send button), then entered in the text box: "+INQ=1" and enter again. The very nice message "OK" appeared and the bee was ready to pair. Red and green leds flashing!

After pairing the bee with my S3, I entered in the same manner the following command/instruction: "+INQ=0" to get the bee out of paring mode.

To most of you this is a very simple exercise, but I was totally overwhelmed with all the information regarding the setup of the blue tooth bee. I mean I could not differentiate between default statuses that can be changed and by just sticking to the default situations.

Nevertheless, the RC car is running just fine!

The applicable Blue tooth Bee features HERE 

Preparing the bluetooth bee with sparkfun explorer usb board

Automotive white LED lamp.

The idea of this circuit is to replace the poor parking lighs on my ZX14 motorbike.

The circuit works well. 

Credit to:

White bright LED for automotive use


I bought this cell phone solar/lipo/li ion charger recently from a shop in Centurion just to find out it is not up to its job! Not good enough to charge my S3. Also it is a very expensive item and not delivering.

I decided to replace the battery with a 3v7 Li-ion 200mA and it works fine now. Perfect.


Emergency Cell Phone Charger

Then I decided to get hold of a Lipo Rider Pro!

Excellent piece of electronics!

I also bought two small solar panels to add to the product.

Working just fine. Also charging my S3 with no hassels!

Casing the effort is next up in line.

And for cheaper as the above shop version too!

Lipo Rider Pro and two cheap solar panels doing a perfect job as a cell phone charger in emergency situations.

I feel this is the best ever 0-30 VDC 3A PSU I ever attempted. it works just fine. 

0-30VDC 3A PSU

0-30VDC 3A PSU

The very common IC7106 volt meter arrangement. Works very well. I built this kit before I attempted the arduino volt ampere meter. Now that the Arduino VA meter works fine, I will use this volt meter else where. 

IC 7106 Volt meter arrangement

0-30VDC Bench PSU

17 December 2012 2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com

2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com

2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com I love my veroboard, because I can! Supply rails are thickened to make provision for the high current.

2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com Here is the beefy capacitor!

2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com. And the beast of a 10 A mains transformer and bridge diode.

2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com. Four by 2N3055 heatsinked. When boxed I will tidy up the connection wires towards the board and transistors.

2.8VDC to 28VDC 10A Bench PSU. LM723 voltage regulator. Circuit by Electronics DIY-com. Big bridge rectifier! Will be chassis mounted!

This is not on veroboard! Can you believe it? this is the 5VDC regulator built for powering the Arduino VA Meter. We don't need much current at all for the Arduino, LCD needs. So I decided to hack a small mains transformer that I got hold of somewhere in the past from a used PC board lying around. The whole regulator will be mounted for the above bench psu (2 to 30VDC 10A)

And once again an Arduino volt/ampere meter which also features on this website. This is my second Arduino VA meter because it is really working well. LCD connections still to be done! This VA meter will be used for this same 2 to 30VDC 10A bench PSU. The Arduino AV meter is capable of 0 to 30 Volts 10A lcd readings.

2.5VDC to 25.45VD PSU 10 A boxed

different angle. Notice the 24VDC fan mounted for cooling purposes.

From the front.

A closer look of the Arduino powered VA meter. The code and previous description regarding the Va meter is on this same website here:

28 December 2012:

In 1990/1/2 somewhere I bought a 12V automotive battery charger kit from an electronics shop in Pretoria which of course is long gone and non existent anymore. 

What is good about this simple circuit design is the bullet proof of the designed charger, e.g. you can short circuit the outputs or connect the target battery poles wrong way round without any consequences. 

This particular battery charger served me well until some years ago the pc board cracked up and broke because of severe heat by the wire wound resistor during charging.

So I decided to rebuild this circuit on breadboard. See the below pictures. The circuit is working fine except the led status indication needs my attention.

I believe this circuit originates out of a magazine from those days, something like everyday electronics or practical electronics. The current circuit is difficult to read specifically where the components needs to be connected indicated by dots and pass over connections etc. But it seems I got it right and ready to serve me once more again. 

This circuit combines current and voltage regulation. It provides safe charging and trickle charging.  


12V Automotive Battery Charger

Sorry, the documentation is about useless, but as I stated the circuit is working and I have the circuit redrawn and available.

12V Automotive Battery Charger with transistors and SCR

12V Automotive Battery Charger with transistors and SCR

12V Automotive Battery Charger with transistors and SCR

12V Automotive Battery Charger with transistors and SCR

5VDC to 34VDC PSU 3A

This time using a LM 2576...I have build this PSU way before my Arduino days. Therefore the analog display meters. 

See pictures below:

3A PSU 5 to 34VDC LM 2576

3A PSU 5 to 34VDC LM 2576

3A PSU 5 to 34VDC LM 2576

09 Jan 2013

Car 12V Battery Charger 

Sourced from:

Below protoboard setup and circuit works excellent.

Will be boxed soon

Car 12V Battery Charger

Car 12V Battery Charger

L298 Motordriver board

I built this l298 motordriver board but with parallel connection to get the 4A rating for one DC motor need I have in a RC car.

See picture below and  the circuit from elsewhere on the net:

L298 Motordriver board

L298 Motordriver board on veroboard. Parallel connection to get 4A rating.

Another circuit from the net regarding L298 motordriver ic connected in parallel to get 4A rating for one DC brushed motor.

L298 connected in parallel to be able to deliver 4A to a single DC brushed motor.

L298 Motordriver board 4A

Simple solar charger with LM317 voltage regulator.

This charger is working excellent to keep my gatemotor lead acid battery  in good condition making use of a solar panel.

Solar charger with LM317 adjustable voltage regulator.

Solid state relay

I have put together this solid state relay from a circuit I downloaded from the internet.

Very simple and it works excellent.

The circuit diagram uses BT136 but I changed ine for a larger current need like 20A plus.

The MOC that I am using , was not getting triggered by the arduino uno output pin. The moc I used needs 15mA trigger, and I thought the uno was going to be able to do the job, but not! or the specs of the MOC requires more than 15mA.

So I decided to do 2x digitalWrite pins high simultaneously to provide more current from the pins and that worked fine for me.

Be carefull with hight AC curents on your veroboard while experimenting, they will certainly fail from heavy currents.



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