Quote Originally Posted by mackrackit View Post
What Dave said...
If I were you I would make a point to start designing things for 3.3...
Thanks for the URL to the Tips file. The only reason I am still using 5.0 volts for the MCU is I am using one of the GPIO pins to power on and off a SRF02 Ultrasonic Ranger, which only operates on 5.0v. I am using two LDO regulators, one for 9v to 5.0 v to power the MCU (and the SRF02), and one further downstream for 5.0v to 3.3v to power the ConnectOne WiFi module.