Picture of Cute AA voltmeter
Ever wonder if those AA batteries are any good.  You could get out the voltmeter and check them.  That can be a hassle.  Sometimes it would be nice just to check them quickly.  In this instructable you will create a cute little AA voltmeter. By the way if soldering is not your thing, you can get the finished product from https://tindie.com/Paulware/cute-aa-voltmeter/. 
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Step 1:

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Get the parts.  Here are some links and prices you can also order this as a finished product from https://tindie.com/Paulware/cute-aa-voltmeter/
These parts are available from ebay for $7.44

$3.60 Blue voltage readout

$2.85   3XAA battery case with switch

$0.99 usb cable

Step 2:

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Drill/Dremel  a hole for the usb cable.

Step 3:

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Connect the usb cable to your laptop or usb power supply.  Using a voltmeter determine which cables are 5V and GND on the usb cable.

Step 4:

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Connect the usb cable 5V to Red cable on tiny meter
Connect the usb cable GND to Black cable on tiny meter
Connect Blue cable on tiny meter to AA +
Connect AA - switch output to usb cable GND

Step 5:

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Test out circuit.  Then solder and glue liberally. 
If soldering is not your thing, you can also get this product from https://tindie.com/Paulware/cute-aa-voltmeter/ for $12.00 (free shipping in US).
useraaaaa2 years ago
1.2voltmeter which requiries 5v
paulware (author)  useraaaaa2 years ago
I created a version on Tindie that uses a built-in power supply: https://tindie.com/shops/Paulware/digital-voltmeter-for-aa-and-aaa-1/
pudtiny2 years ago
Great little device, but I am not sure having to find power for this would be any quicker than picking up a meter to do the test