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PIC16F84A Digital clock - Hours, Minutes and Seconds

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Hi Friends,

This is a PIC16F84A Microcontroller based digital clock. It displays hours, minutes and seconds using six 7 segments displays.
The circuit has three push button switches to reset and set hours and minutes.
It shows time in 12 hour format.

Use the following link to download schematic, source code and compiled hex file -


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  • 2 weeks later...


Thanks for posting it. I see on schematic that the COLLECTOR of cathode transistors are not connected anywhere. They should be tied to ground. Also i spotted that PIN18 is connected to CD4017 CLK and PIN17 is connected to RES of CD4017, BUT according to source code comments they should be reversed.

Did you spot any other issue building this circuit on protoboard?

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