Great UPS for Raspberry Pi

[dynamicdave]

Have a look at this tutorial guide I wrote for a couple of my IoT students to explain how to use the INA219 voltage/current/power sensor, it might be useful in your situation.

Using a INA219 to measure voltage and current

A very short tutorial (for my IoT students) explaining how to use the INA219 device to measure voltage and current in a circuit. As with most of my projects, a Wemos D1 Mini is used to provide the control/sensing interface (rather than risking the GPIO pins on a Raspberry Pi). The tutorial explains how to sense the voltage on the Wemos 3V3 and 5V pins (and the current flowing through a 330 ohm resistor acting as a 'light' load), and then goes on to connect a solar panel to the experiment. Tut…