Arduino Controlling a 12v LED

Here a simple Step by Step Tutorials on how to Solder together  a prototype board to become an Arduino High Power controler devices. This is mainly base on this nicely done tutorials on Bildr . This is mainly a step by  step attempt to help my students visualize the step like a recipe. In this setup we will use some stackable header so you won’t need to solder the TIP120 or TIP121 to the prototyping board… So you will be able to reuse the Transistor on the fly for others experiment or interactive object.

 Arduino Controlled a 12V light Single Colors (see RGB post ), or using the same wiring you can also power bigger DC motor and solenoid.



Hardware required:

  • DC Barrel Jack Adapter (5.5×2.1mm, center-positive female barrel jack)
  • 2.2K Ohms Resistor
  • TIP120 or TIP121 Darlington Transistor.
  • Brown Prototyping Board (Row linked)
  • Stackable header …… min 1X3, 1X2, 1X4 ++
  • 100~240V AC to 12V DC 600ma Adaptor
  • Red/Black Single core wire
  • 12V LED



Step01              Identified the + from the –  Then mount it on the board.

From the AC to DC adapter . You can see from the indication from the adapter that the positive been the male pin inside the barrel. So from this diagram we can do the assumption that our female barrel will be the same… But watch out if the connection are wrongly assign the rest of 

this step by step will be wrong and be potentially damage your Arduino or yourself.

 20130715_143922-1_resized     +-

Now, base on the 3 pin below the female Jack Barrel connector, dig 3 hole as appropriate on the prototyping board. Then simply solder the + and – pin. You can let the middle pin un-solder we are not using it.



Step02              From your  Breadboard to the prototyping board.

You should preferably follow the Bildr tutorials. Then if you all good you can reproduce the pattern as in the picture below. Then simply solder



Step03              Testing and Wrap-Up

  • Simply verified if the setup is actually working. Simply upload a BLINK code to the Arduino and connect as indicated below.
  • If everything is fine simply hot glue to isolated the soldering connection. If not Debug your Soldering.
  • See the Extension Pack to connect more then 1 light.

Extension Pack

If the need of extra light is required you may want to build yourself an Extension Pack as presented below.

Hardware required:

  • Brown Prototyping Board (Row linked)
  • Stackable header … 2 X 1X16
  • Single core wire

 Step01              Just do it 😀

  • Mount the stackable header over the prototyping board.
    (In my case i needed a spacing of 1 row in between the header. It may be different for you.)
  • Simply solder the line together
  • Add indication on you board to mark the intended Vcc and Grd location.


You are Done See the next post for a RGB setup


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