Tinyscreen+ Vbat reading

falaroce

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Hello,
I ordered the tinyscreen+ and an lipo battery, and I would like to now if there is a way to read battery voltage, in order to print a % of battery remaining ( and possibly add an auto-shutdown with "save state").
I didn't see anything in the schematic that would let this possible, but I am clearly not an expert.
It is possible?


thesko

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Hi, I would also like to know how this could be done!

The only information I've found so far are rather complex "hacks" to estimate the data:
https://codebender.cc/sketch:91833#TinyScreen_Smartwatch.ino
(look for the displayBattery() function)
http://forum.tinycircuits.com/index.php?topic=1599.msg3087#msg3087
(more or less the same as above)
http://forum.tinycircuits.com/index.php?topic=1412.msg3419#msg3419
https://gist.github.com/KhanradCoder/d016330a9b69bf7c659a


Is there an achievable way of modifying the TinyScreen+ board to get a voltage readout of the battery and maybe even a charging state?

Can some of the TinyCircuits staff help here?


lennevia

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Hey guys!

We're working on getting a tutorial up about this right now! Thank you for your patience!


thesko

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That is awesome news! I can really make use of this for my current project! Thanks for the update  :)


lennevia

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The tutorial is up! Check it out here: https://tinycircuits.com/blogs/learn/tinyscreen-battery-voltage

If you're interested on how we figured this out, or maybe what hardware we used, I attached a picture of the part of the TinyScreen+ schematic we used! ;)

But it really is some sticky math to get it all figured out, so feel free to save yourself from the frustration and just use our functions in the tutorial!   :)



thesko

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Works like a charm!! Now I just have to find the fitting values for a battery display with my configuration/power consumption :)

Thanks a lot!


 

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