Running an Arduino (Uno/Nano etc) is a general no-no because they consume too much power. But here we explore how to put the ATMEGA328P chip to sleep and then wake up again when a pin goes low (using an interrupt, generated with a switch).

It's very easy to do and as a first stage in getting your Arduino to run on battery power, it's essential that you understand the simple commands that need to be executed.

The power drops quite a bit, but is it enough to run on batteries?

This video, #115, provides the groundwork to part two (video #116) in which a different approach is taken to wake up the ATMEGA328P and in which we show exactly how much power is taken up by a "bare-bones" Arduino - you'll be amazed.

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Also, have a look at Thijs Ruiter's Kickstarter campaign - if he reaches his goal I'll do a proper review of his sound module:
http://kck.st/2M2KeRr

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All links, sketches and other information:
https://github.com/RalphBacon/Arduino...

The 18650 Battery Charge Shield:
https://www.aliexpress.com/item/ESP32...

The official ATmega28P data sheet:
http://ww1.microchip.com/downloads/en...

The FP6298 PWM converter datasheet:
http://www.feeling-tech.com.tw/km-mas...

Arduino pin mapping (GPIO numbers vs Chip numbers):
https://www.arduino.cc/en/Hacking/Pin...

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