PIC16F628 Digital Clock Timer

PIC16F628 Digital Clock Timer

This clock timer uses a PIC16F628 microcontroller to display 3.5 digits of time and control external loads. It can be programmed to time from 1 to 59 minutes. The clock includes a calendar with leap years and optional daylight saving time adjustment. The timer output can be set from 1 to 59 minutes and can be manually switched on and off. The clock also features a correction function, allowing an extra second to be added every few hours to compensate for a slightly slow oscillator. The oscillator uses a common 32.768 kHz watch crystal, and the frequency can be slightly adjusted via a 24 picofarad capacitor to the right of the crystal.