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Step 6Test the Leads
LED stands for Light Emitting Diode. A diode is an electrical component that allows electricity to flow in one, and only one direction. As a result, LEDs will only work when electricity flows in a specific direction. This step will help you label your LEDs so that you know which way to use your LEDs in future projects and save you time.
I'm using my Arduino Mega fed by a wall-wart as a power source. With my particular LEDs, I don't need to use resistors with my power source, but you should use resistors between your VCC and your LED.
To make testing the LEDs easier and faster, I've wrapped and taped wires around two US quarters (any large coin will do) to give me a larger contact points. One of the wires has been labeled with a white bit of electrical tape to signify it is the VCC and the other is the ground.
You'll need to test every single LED and put a small piece of white electrical tape around the positive lead.
I'm using my Arduino Mega fed by a wall-wart as a power source. With my particular LEDs, I don't need to use resistors with my power source, but you should use resistors between your VCC and your LED.
To make testing the LEDs easier and faster, I've wrapped and taped wires around two US quarters (any large coin will do) to give me a larger contact points. One of the wires has been labeled with a white bit of electrical tape to signify it is the VCC and the other is the ground.
You'll need to test every single LED and put a small piece of white electrical tape around the positive lead.
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