Hi and 1st of all sorry for the bad english.
I whant to make a board that uses a arduino mini to use it like an aux car engine heating.
The board must do this:
For the board to start heating the engine it must have 3 conditions: 1. The car voltage must be at minimum13.8v 2. the engine temp must be below 30 degree C 3. when te 1st and 2nd conditions are made, the board waits 10 seconds to start the comand of heating.
The heating comand will activat a High amp relay that will heat am the glow plugs in the engine cooling system.
The board will olso have 3 LED, one for each condition is its made.
Can you help me make this project, i know that i need a digital temp meter and a high amp relay but in rest i dont know how to measure the voltage and how to make the code. Someone made a borad like this... here Thanks