Simple clock with calendar based on atmega328p MCU and DS3231 real time clock module.
* calendar up to year 2100
* room temperature sensor
* 128x64 graphical LCD screen
* automatic LCD brightness control
* power saving modes
* backup Li-Ion battery
* encoder as user input
* hold for 5 seconds encoder button to start date time setup
Software source code can be found [here](https:...
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