# Great UPS for Raspberry Pi

**URL:** <https://discourse.nodered.org/t/great-ups-for-raspberry-pi/16575>\
**Category:** Hardware\
**Created:** [10 October 2019 21:05 UTC](https://discourse.nodered.org/t/great-ups-for-raspberry-pi/16575 "2019-10-10T21:05:33Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)\
**Post date:** [11 October 2019 04:38 UTC](https://discourse.nodered.org/t/great-ups-for-raspberry-pi/16575/3 "2019-10-11T04:38:44Z")

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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](https://discourse.nodered.org/t/using-a-ina219-to-measure-voltage-and-current/16407):
>
> 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…](http://resources-area.co.uk/node-red-flows/voltage_and_current_sensors.pdf)

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