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Display Charge
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Display Charge

by Shane_Butterbean on Mon Jan 30, 2017 12:10 pm

Is there any way I could modify this in order to display a charge level with LEDs? My reason for doing this would be in order to tell if I need to use new batteries. I would have a series that would go green, yellow, orange, then red. Is there any small logic board that would be able to get this information from the batteries and in turn display it this way? If so, how would I go about this?

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Re: Display Charge

by adafruit_support_rick on Wed Feb 01, 2017 7:14 am

Well, you could add a Trinket. Read the battery voltage with the analog input, and light LEDs accordingly. Be aware that alkaline batteries tend to maintain voltage until they are about 80% discharged, then the level falls fairly rapidly until they are fully discharged. So you won't get a linear discharge reading on your LEDs.
You can see a representative graph of voltage vs. charge here:
http://www.batteryspace.com/productimag ... A2300A.pdf

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