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Picture of Cute AA voltmeter
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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
http://www.ebay.com/itm/280928770982?var=580118175716&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

$2.85   3XAA battery case with switch
http://www.ebay.com/itm/1pcs-3xAA-3AA-4-5V-DC-Power-Battery-Case-Box-Holder-Switch-Cover-with-Cables-UM9-/290737949440?pt=LH_DefaultDomain_0&hash=item43b1550b00

$0.99 usb cable
http://www.ebay.com/itm/NEW-USB-2-0-MALE-AM-M-TO-FEMALE-F-EXTENSION-CABLE-/270987217823?pt=US_USB_Cables_Hubs_Adapters&hash=item3f1818cb9f

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