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Simple LED clock based on atmega328p, 32KHz clock crystal, TM1637 i2c LED module, 18650 Li-ion battery and TP4056 charging module

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atmegaClock

ATmega328p clock with Li-ion battery management

Simple clock, based of 32768 Hz crystal oscillator with automatic brightness control and power saving modes for backup Li-ion 18650 type battery.

Display is TM1637 7-segment LED i2c module

Fine clock calibration can be achieved by changing weekly correction value: hold Snoose + Alarm + Hours/Minutes to decrease/increase value.

atmegaClock schematics

Original schematics and some pictures can be found here

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Simple LED clock based on atmega328p, 32KHz clock crystal, TM1637 i2c LED module, 18650 Li-ion battery and TP4056 charging module

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