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Old 08-10-2013, 06:04 PM   #1
alien
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Default Cheap 4 digit 7 segment display option

I ordered a bunch of cheap voltmeters from BuyInCoins (8 for $20) intending to hack them for use as temperature displays. They haven't arrived yet, but luckily in the meantime somebody else has done all the hard work of figuring out how to convert them to general purpose displays:

http://www.ba0sh1.com/hacking-a-cheap-led-voltmeter

Non-cheapskates can get a purpose built I2C controlled display from Adafruit that will do the same thing for $10 each.

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Old 08-19-2013, 11:21 AM   #2
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Got it working last night. I needed to buy an STM8S-DISCOVERY development board to do the programming ($8 from Digikey). Even so this hack has saved me more than $50. Details here https://github.com/t0mpr1c3/I2C-LED

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Old 08-24-2013, 09:07 PM   #3
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Blog post: http://smokedprojects.blogspot.com/2013/08/i2c-led-display-from-hacked-voltmeter.html

Picture shows 4 displays driven by the 2 I2C pins on an Arduino. I am going to be using these for PID displays.

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Old 08-25-2013, 02:15 PM   #4
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Blimey, it's on Hackaday now!

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Old 12-02-2013, 01:58 PM   #5
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This might be a good option too, certainly cheaper than the oscsys offering. Twin 4 digit outputs on a single PCB.

In red, blue, or yellow. Discounted today (Cyber Monday). I have no connection with this vendor by the way.

https://www.tindie.com/products/rajbex/double-row-4-digit-seven-segment-red-led-display-module-with-spi-interface/

https://www.tindie.com/products/rajbex/double-row-4-digit-seven-segment-blue-led-display-module-with-spi-interface/

https://www.tindie.com/products/rajbex/double-row-4-digit-seven-segment-yellow-led-display-module-with-spi-interface/

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