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Thread: Hacking a LED voltimeter + thermometer to test battery with alarm

  1. Question Hacking a LED voltimeter + thermometer to test battery with alarm

    Hi everyone, I was wondering if it would possible to hack one of those cheap LED voltimeter + temperature modules http://www.ebay.com/itm/0-56-33-200V...item2c766bfaba, to send its data to an Arduino, so we can use it to turn on buzzer alarms when our battery is running low or if the temperature is too high. Any ideas?

    Would it be easier to just create a self made voltmeter and use a temperature sensor instead?

  2. Re: Hacking a LED voltimeter + thermometer to test battery with alarm

    Your Arduino has analog pins. Create a resistor divider to get the voltage down to the level within spec of the A/D port, and check it periodically. Temperature sensors are cheap and easy to interface to.
    "The best way to predict the future is to invent it." - Alan Kay, inventor of Smalltalk

  3. #3

    Re: Hacking a LED voltimeter + thermometer to test battery with alarm

    Yes; a LM34DZ for temperature is $2.52 at Digi-Key: http://www.digikey.com/product-detai...FNOPB-ND/32485
    Two resistors (say, 22 kOhm to analog pin, and 4 kOhm from that pin to ground) makes for a good voltage divider, making about 1V analog per 5V on the battery (so 1000 in means approximately 25V battery; 200 in means approximately 5V battery.)

  4. Re: Hacking a LED voltimeter + thermometer to test battery with alarm

    Yes, you are right, after seeing how difficult would be to reprogram it, using components is the best choice. I just wanted to try to set something easy and compact using already made components, but sometimes that's not the best idea. Thank you guys.

  5. Re: Hacking a LED voltimeter + thermometer to test battery with alarm

    Hi everyone, I've received the voltmeter and I find them not so good for less than 4V So defintely not the way to go with so many complications and limitations. I'll let you all know how the battery gauge for powered wheelchairs go in the project thread. Thanks

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