Voltage divider for 12v to ADC pin
Posted: Sat Apr 09, 2016 4:11 pm
I want to read car battery voltage from the OBD port (~12v, 4A) via ADC pin. The current plan is to use a voltage divider (R1 100k - 1W, R2 5k - 1W). A calculator says that this input would be 48 watts. Do I need different resistors, or a different plan? Do I need an voltage sensor board? I really don't know what I'm doing, and could use some advice.
Thanks for any help.
Thanks for any help.