For some time I wanted to put LED DRL (Day Running Lights) on my car.
It was some pain in the a*** to run the wires into the car and I was looking for a simple and elegant solution.
And I was hit by inspiration!
I found the solution!
A DRL which power ON at the engine start and goes OFF a few minutes after the engine is stopped!
Simple, with an Arduino we test the battery voltage and decide to go ON or OFF because the lead-acid car battery goes under 12.8 V when the engine is stopped and above 13.4 when the engine is running!
Here is the code:
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