12 24Hr Big LED Digital Clock Circuit - 16F84

Few years ago I build a 24Hr clock using logic ICs. It’s work nicely but little complex to beginners. So I think build clock using pic IC. Check the below picture. Hope you like it.

16F84 digital clock

It’s very easy to build and time accuracy is 99.999%. Because I use a clock circuit to generate the 1Hz pulse. It drive the clock. Use well smoothest power supply to give power to the circuit.

Preview of clock

Use '16F84A_12Hr.Hex' for 12 hour clock and '16F84A_24Hr.Hex' for 24 hour.

What is clock circuit?

I use the clock circuit to drive the clock because it is the easiest way to keep time accurately without using Real time clock IC such as DS1307. You can buy an ordinary clock machine in a shop. It is very cheap. Then open it and get the circuit out. That is the clock circuit! Connect outputs of clock circuit (winding of coil is connected to here) to P5 and P6, (+) to P7 and (-) to P8. That’s all.

clock circuits

Now you can work in time. :D

PIC16F84A Datasheet

pin-out

Hex File
Circuit Diagram and PCB