“The simple and “Perpetual” WristWatch(“LumiTime”) with 12 red LEDs, it have LIR2430 Li-Ion battery, 12 solar cells, based on Microchip CPU.
The simple and “Perpetual” WristWatch(project code name “LumiTime”) with 12 red LEDs, it have LIR2430 Li-Ion battery and 12 solar cells, based on a simple Microchip microcontroller ATtimy13. It full open source(firmware and hardware).
How it’s work?
Every 0.5 sec CPU wake up(cycle iteration time 100 nS) and increase milliseconds value and go to the sleep mode(3-5 uA). Wristwatch have one button “NOW” and 12 LED, if you push the button - show times on LEDs in the next algorithm - first, show hours(1, 2, 3, 4, 5, 6 etc….) and second is show minutes with 5 min. accuracy(5, 10, 15, 20, 25, 30 etc….), show 0.5 sec to the hours and 0.5 for minutes -> sleep mode again.”