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We have a bunch Adafruit lipo chargers lying around. I think we probably use this one: https://www.adafruit.com/products/1304
Here's the spec sheet: http://www.nxp.com/assets/documents/data/en/data-s...It says .1m resolution. But I'm sure accuracy depends on calibration.
Or maybe this one from Sparkfun: https://www.sparkfun.com/products/10217 I think they both work.
Nope, it's just what I had lying around and I thought they looked pretty. In fact, countersunk screws would be better because the ball sometimes hits them and bounces in a weird way.
It should just come right on. It's possible that the libraries have changed a little since I wrote the code, so you should look at that and see if there's any other steps they've added.
Looks like you can still get it here: https://shop.pimoroni.com/products/retro-4-digit-led-display
Also you can find it on ebay search for qdsp6064
simple user-adjustable DIY Nixie Clock
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