Tinyscreen+ Vbat reading

[falaroce]

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]

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]

Hey guys!

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

[thesko]

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

[lennevia]

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]

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!