Help using my UNO as a switch

Other Hardware Motors, Mechanics, Power and CNC
1

I have a key fob that has its own 3v power. I want my Arduion to complete the circuit between the fob’s ground and unlock wire or the ground and lock wire.

Right now when the lock wire (+) and the (-) touch the doors lock (also works with the unlock). This is powered by the fob’s internal battery. I want to know how I would wire these wires to the Arduino. I’m programming pin 11 & 12 as output and wondering if I put a .25v output via analogWrite that would complete the circuit.

I don’t adding 3v on a circuit that already has 3v on the line is wise. All I’m looking for is to have the Arduino complete the circuit.

Any help? Please

2

munkman02:
wondering if I put a .25v output via analogWrite that would complete the circuit.

Analog write is a bit of a misnomer. It's analog in that it switches a digital output on and off very fast at a variable duty cycle. Search the term 'pulse width modulation'. It's not analog like a continuous change from 0v to 5v.