I have an idea for a data logger or remote wireless sensor. I want to run it on 2xAA alkaline cells which is no problem for the MCU (ATmega328P), but I may want to use sensors that require 5V. I found a switching regulator (MCP1640C) that has a bypass mode, which can be controlled by an MCU pin. Whe…

Varying MCU supply voltage

Docedison January 6, 2013, 5:24pm 12

Which rail?, there are three, 5 V, 3V3 and GND...

Bob