A programmable countdown timer with loud voice countdown and trigger for dangerous experiments like starting fireworks
Project tutorial by Shahariar
DIY Illuminated Gaming Controller with LED Tactile Buttons powered by Beetle (Arduino Leonardo)
3-channel voltmeter with the ability to measure both negative & positive voltages on the same circuit or 3 different circuits simultaneously
An accurate clock with date displayed on a 16x2 LCD using just the Arduino, the display and few buttons. No RTC module required.
Project tutorial by paulsb
Turn a hot air popper popcorn machine into a high tech coffee roaster using a relay, 120V transformer, and thermocouple.
Project tutorial by Ben Eagan
Like you said "it appears that the inaccuracy is consistent" , I can assure you that you are correct. I have a similar clock setup running for 7 years ( Big 7 seg display with arduino). Ever after software correction for lost time, it slows down 10 minutes every 6 months.
Update : This is still working
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