Hey people I'm driving a relay with a arduino-teensy with 3.2v logic levels.
Some background. I'm going with a mosfet because the coil voltage is relatively high. The relay will have 20a/220v contact voltages. I'd like to have an LED turn on when the relay is active, and I'd like to have a manual switch to override the logic control of the circuit.
1) could someone verify that this is the best way to light up the LED? I read on line the parallel circuit is better than running the LED in series, if it fails then the relay fails.
2) Which choice would be best to use a circuit to override the logic level coming from my arduino? If the arduino pin mode is:
does it care if I put 3.2v external on that thing? Or would it be better to just connect the drain side of the mofset (Q2) to ground?