Hi, i'm working on a small embedded GPS system, I've already got a low power gps picked out. I know that I would either need a logic converter or use the 3.3v arduino pros to interface to the gps, my question is can i run a breadboard chip with a 16mhz crystal at 3.3v or do they have to be at 5v. I want to use the soft serial library and i'm worried that at 8mhz the serial interface won't work
my question is can i run a breadboard chip with a 16mhz crystal at 3.3v
According to the data sheet you can’t 16MHz is outside the range for 3v3.
It might probably work but could be unreliable.