A Digital Clock can be made easily by using PIC Microcontroller, DS1307 and a 16×2 LCD. I have already posted about Interfacing DS1307 RTC with PIC Microcontroller. The DS1307 RTC can work either in 24-hour mode or 12-hour mode with AM/PM indicator.
It automatically adjusts for months fewer than 31 days including leap year compensation up to year 2100. DS1307 comes with built-in power sensing circuit which senses power failures and automatically switches to back up supply. We can provide a 3V CMOS Battery for that. Communication between PIC Microcontroller and DS1307 takes place through I²C Bus.
Suggested Readings:
Circuit Diagram – Digital Clock
Digital Clock using PIC Microcontroller and DS1307 RTC – Circuit Diagram
I hope that you can easily understand the circuit diagram. The circuit is powered using a 5V power supply. 8MHz crystal is connected to PIC Microcontroller to provide necessary clock for the operation. An RCR (Resistor-Capacitor-Resistor) made using 10KΩ, 0.1µF, 4.7KΩ is connected to MCLR pin of PIC Microcontroller as recommended by Microchip. It will work fine even if you tie MCLR pin directly to VDD but Microchip doesn’t recommends it. DS1307 RTC is connected to PIC microcontroller via I2C bus. Pull up resistors connected to I2C bus is very important, please make sure that you are using correct values for it. An additional power supply (usually a battery or button cell) is connected to DS1307 RTC for running the clock during power failures. This circuit will function even without that battery also but the clock will stop and reset during power failure.
For more detail: Digital Clock using PIC Microcontroller and DS1307 RTC
Current Project / Post can also be found using:
- how to make rtc using pic microcontroller
- rtc using pic microcontroller
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