I’ve been through a few iterations of trying to provide a single ground output on the arduino and I have had no luck. The main issue is that the output needs to have 0 resistance to ground. It is actually simulating a pull to ground on an already existing circuit on a car. It is a 5v pull-up from an ECU in the car. I simply need to pull the circuit down for about 500ms.
I have tried wiring it directly to the digital pin 3 with no success +100ohms
I have tried wiring it with a 2n2222 and it still has +60ohms
I have tried using a panasonic AQV259 and it has 60-120ohms depending on which leg I use.
All of them have too much resistance to trigger the circuit. I am not extremely familiar electrical components at this level. I know how to do this in a automotive world with relay (which is what I thought the transistor and the DC relay (AQV259) would accomplish for me).
Can someone please suggest a way to get a straight pull to ground with no resistance and very little current? I would appreciate it!