I am working on an automotive project. I want to use 12VDC outputs from the car (which means it can peak at around what…15VDC?), meaning when a circuit is made. I want to read those outputs as inputs to an Arduino. Or to put it another way, when I switch on my headlights, I want to know that they are switched on by reading the 12VDC at the headlight as an input to the Arduino pin.
My options, from some research is to either use an opto (nice article here of someone also needing the 12VDC as input):
Or go with SSR. I am assuming, even though SSR’s will be more expensive, they will be easier to implement since I’ll purchase the SSR I need, then place it in the circuit.
Thus my question, which would be the elegant solution, the more robust solution?
I’ll have to figure out which SSR to go for if I do, but I am sure that won’t be too difficult. Although, I’m not always sure what is meant by it all. Merely found this one based purely on price at a glance and the 15V.
Thank you kindly for your experienced advice.