Hi Guys I need to detect whether several wires in a car are "on" or "off". I'm concerned about connecting up to 15v (max I measure on my car) directly to an analog input. What's the safest/simplest way to determine if wire is hot or not Thanks mark

Safely detecting 12v on/off in car

robtillaart April 15, 2013, 5:18pm 3

+1 for optocoupler

you may also google for ruggeduino...