Salivations!
I've a project where I'd like to use an Uno to initiate code when the auxiliary power comes on in my car. I figure I'd run a tap out of the aux fuse in the car, and run that into one of the Arduino INs, testing for a HIGH input.
With the car voltage at 12 to 15 and needing to be dropped to 5v for the Arduino input, I was thinking of using this buck converter and wanted to see if that was a good option for the need?
Appreciate suggestions!
Hi,
If all you need to do is sense the point going from near zero to 12..15V, all you need is two resistors in series across the source as a "Voltage Divider". Like 20K on the top, 10 K on the bottom. 15V in gives 5 V out. You can read that with an analog input if you want a value, or put it into a digital input as a true-false..
Use two 10K in series on the top is easiest. Three of any resistance value from maybe 5K to 25K would be OK for the three identical resistors.
Terry, awesome idea. I'll give it a whirl. Thanks!