I have breakout board for a component that is to the Uno using the serial port only. I need to reset the breakout board when the Uno is reset, but the mismatch in voltage levels (3.3V vs 5V) means that I can't connect the Uno reset signal directly to the breakout board.
Any suggestions for would be the easiest (cheapest and least components) way of doing this, given that there is just one signal whose level needs to be shifted?
I did some research and 2 ways stood out as being 'quick and dirty' but workable. Simplifying factors for me are that the signal (RESET) hardly changes at all and it is only one way from 5V to 3V. The easiest ways:
Voltage divider as already previously mentioned
Zener diode voltage clamp on the signal
Here are some references in case anyone is interested