The refresh rate of the digits is about 53Hz and there is no visible flickering. The RTC chip is also connected to PORTA using the I 2C bus. All display segments are connected to PORTB and COMs are connected to PORTA. The RESET Pin (MCLR) is also used as input for one of the buttons. The heart is the PIC16F628A microcontroller running on the internal 4MHz oscillator, so no external crystal is needed. This project is heavily inspired by the “ Simple Digital Clock with PIC16F628A and DS1307” in the case of schematic and we also used the same. The display we used is a 0.28″ SR440281N RED common cathode display bought from, but you can use other displays as well such as the 0.56″ Kingbright CC56-21SRWA. ![]() ![]() It is able to only show the time on a small 7-segment display with a total of 4 segments. ![]() This is a minimal and small clock based on PIC16F628A microcontroller and DS1307 RTC IC.
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