I am writing a program that will test radio harnesses custom pinned for a customer. I have messed with some simple VU meter program code and can get 1 line to work fine. My issue is when I connect all 4 (left front, right front, left rear, right rear) that I get all 4 lines triggering even when there is no signal going to them. I don't need to know what the levels are... basically is there signal or no. I'd be game for each speaker lead to trigger a transistor allowing 5V to be read by digital pins. This needs to be simple and as few discrete components as possible. Triggering the transistor is looking better than direct connect to an analog input. The speaker values are in mV.
Any help would be appreciated!
Thanks!
Doug
Any help would be appreciated!
Thanks!
Doug