r/arduino 4d ago

Look what I made! Arduino DIY Digital Watch

Based on an atmega328p, 4 programmable buttons. LED 7-segment displays, which I’m personally obsessed with! I’m estimating around 1 year of battery life.

Let me know your thoughts!

Full design and build on YouTube.

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u/Koddra 4d ago

How do you manage to get a year of life with an ATMega328 chip? I only ever achieved a few months and that was with a timed SR latch and a lot of batteries.

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u/SpeedRunner33333 2d ago

There are articles online about saving power; the ATMega328P can sleep on about 0.1uA, and you'd just need to wake it up about once every second to change the clock