Reducing Arduino Power Consumption
Contributors:
Alex the Giant
Alex the Giant 
Resources and Going Further
More information on low-power modes and options can be found in the datasheet for the 328P.
For more power-related fun, check out the following SparkFun tutorials.
Photon Battery Shield Hookup Guide
The Photon Battery Shield has everything your Photon needs to run off, charge, and monitor a LiPo battery. Read through this hookup guide to get started using it.
SparkFun 5V/1A LiPo Charger/Booster Hookup Guide
This tutorial shows you how to hook up and use the SparkFun 5V/1A LiPo Charger/Booster circuit.
Qwiic Quad Relay Hookup Guide
SparkFun’s Qwiic Quad Relay is a product designed for switching not one but four high powered devices from your Arduino or other low powered microcontroller using I2C.
Hookup Guide for the SparkFun RedBoard Artemis Nano
Get started with the powerful RedBoard Artemis Nano