I'm trying to interface a 3.3v microcontroller with an arduino running at 5v. Pin 1 on the 'duino is the reset line and it's active low. Standard arduino design has a 10k pullup on pin 1 (to +5v). When you want to reset the arduino, you ground pin 1. I believe the arduino considers anything below approximately 0.6v as a logic 0.
I'd like to keep the grounding switch, but add the ability for the 3.3v microcontroller to _also_ reset the 'duino by going to a logic 0. What is the best way to do this?? OR gate?? MOSFET on 3.3v line?? Two different pullup resistors with different values??
Appreciate the help!!!
tod
I'd like to keep the grounding switch, but add the ability for the 3.3v microcontroller to _also_ reset the 'duino by going to a logic 0. What is the best way to do this?? OR gate?? MOSFET on 3.3v line?? Two different pullup resistors with different values??
Appreciate the help!!!
tod
