Voltmeter addon for my Surf PI

[Pete61]

Im using 3 x 1000mah KY18350's from disposable vapes for my 12V Surf PI batt pack and need to know when they drop to 11.1V (3.7v per cell)
So I installed a small volt meter module.
I lost the push buttons nut so its held in with hot melt glue.


At full charge minus some testing to see if a Nokia ear buds for cellphones will work. (yes quite loud)



PCB side of the module, IC has been wiped.

[Nightryder]

As long as it has an ON/OFF switch, I have nothing against it. Because you do not want it to be on all the time. I hope it does not take much space in the box.

Thanks for sharing!

[Pete61]

As long as it has an ON/OFF switch, I have nothing against it. Because you do not want it to be on all the time. I hope it does not take much space in the box.

Thanks for sharing!

That perm on was my first concern, so thats why it has a push to make that connects to the live side of the Dupont "on switch" connector on the pcb.
That way you can push to see the current volts regardless of whether the main unit is on or not.
Takes about 5mm space in the end cap as seen in the last pic.