Low power Arduino based Smart Watch

Hardware Microcontroller: Atmega328p with Arduino bootloader Real Time Clock: Maxim DS3231 (<2min per year deviation) Display:...


  • Microcontroller: Atmega328p with Arduino bootloader
  • Real Time Clock: Maxim DS3231 (<2min per year deviation)
  • Display: 96x96 pixel Sharp Memory LCD (LS013B4DN04)
  • Battery: CR2025 160mAh coin cell


  • The ATmega is in Sleep mode for most of the time and only runs once a minute to update the time or if a button is pressed. This reduces the current consumption to 2uA. Sady the display needs a certain pulse every second, which requires a complicated additional circuit. Because of this, the current consumption is around 20uA. This still makes for around half a year of battery life.
  • User Interface controllable with three side buttons. Buttons are 3D-printed and activate switches on the PCB
  • Tells time, date, temperature and battery voltage on the main screen. No additional temperature sensor is needed because the DS3231 already has one integrated for temperature compensation.
  • Stopwatch
  • Flappy Bird clone ("That would have been cool in 2013")
  • The case consists of four 3D-printed parts. It has a thickness of only 10.8mm, which is thinner than the Apple Watch. Unfortunately, it lacks screen protection.
  • Fits any 22mm Watchband



Arduino,2,Raspberry Pi,1,
Robokart: Low power Arduino based Smart Watch
Low power Arduino based Smart Watch
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