Battery Babysitter Hookup Guide
Contributors:
jimblom
jimblom 
Resources and Going Further
The SparkFun Battery Babysitter and the BQ27441 Arduino Library are both open-source, so there are plenty of resources to go around, including:
- SparkFun Battery Babysitter Schematic (PDF)
- SparkFun Battery Babysitter Eagle Files (ZIP)
- SparkFun BQ27441 LiPo Fuel Gague Arduino Library GitHub Repository
- SparkFun Battery Babysitter GitHub Repository
- SFE Product Showcase
If you'd like to learn more about the BQ27441-G1A LiPo Fuel Guage, TI has published an excellent 59-page Technical Reference manual, plus, of course, there's the datasheet.
For more information on the BQ24075 LiPo charger, the datasheet should have all of the information you might need.
The Battery Babysitter can be incorporated into just about any LiPo-powered project out there. If you're looking for a little project-inspiration, check out some of these great SparkFun tutorials:
Photon Remote Temperature Sensor
Learn how to build your own Internet-connect, solar-powered temperature collection station using the Photon from Particle.
Blynk Board Washer/Dryer Alarm
How to configure the Blynk Board and app to notify you when your washer or dryer is done shaking.
Sparcade: Edison as a Web Server for Browser Games
Turn the Intel® Edison into an access point that serves a simple browser-based game. High scores from the game are displayed on a character LCD.