Using a INA219 to measure voltage and current

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#1

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.

Tutorial guide

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#2

Nice Dave, I have had 2 of these laying around waiting for inspiration!

#3

Well now you have it.

Actually, the INA219 will eventually be used on the 'Weather Station' project to sense and report the voltage of the solar panel.

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#4

Hi! I a have a question. I found this contrib for ina219 https://flows.nodered.org/node/node-red-contrib-easybotics-ina219-sensor . Do you thing that is compatible with raspberry pi 4? I'm new in and i don't have any practise with this. I tried your tutorial it was working with Wemos but I'm not sure about wiring and programming into rpi.

#5

I haven't a clue as I've never used the I2C pins on a Raspberry Pi.

Here's a link that seems to explain what you need to do.


And here's a photo of the Pi-2 and 3 pinout (I suspect the RPi-4 is the same).
RP2_Pinout
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