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http://www.electronicsfreak.net/
tutorial about Arduino microcontroller I2C and RTC technology
I am using here very cheap DS1302 RTC (real time clock) with battery backup that can hold clock for may years!
also LCD display 1602 (16 characters 2 lines).
You can get the parts here:
LCD 1602 display: http://bit.ly/LCD1602
Amazon: https://amzn.to/3N2mpvn
Arduino UNO: http://bit.ly/Arduino-Uno-1
Amazon: https://amzn.to/43zSMa2
RTC clock: http://bit.ly/DS1302-RTC
for other electronics stuff visit
http://www.electronicsfreak.net