Real Time Clock Display

Ha, Hei Kuai (2005) Real Time Clock Display. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Predominantly, the title of this project is Real Time Clock Display (Part I)for design circuit and troubleshooting. The project is about the design of a Real Time Clock I Timer circuit using microcontroller that would accept inputs from switches,set and display the current time, set multiple timers to activate a particular device connected to the circuit. This Application Note explains how to control the display of characters on a 5x7 LED matrix display using the microcontroller PIC16F877 MCU. A ten-unit 5x7 matrix display (350 LEDs) is controlled by microcontroller PIC16F877 (40 pins). The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The RTC provided in this Application Note facilitate easy implementation for displaying clock on a 5x7 LED matrix. It has a display which is 50 columns wide, enabling 10 characters to be shown at any one time. The characters in each message are stored in an EEPROM with one byte corresponding to one column of dots. Storing the characters in this way rather than as their ASCII codes has the advantage that, apart from being simpler to decode with the electronics, any character or graphic needed can be easily formed. The circuit runs from a 5V DC regulated supply and consumes around 300mA peak when at LEDs are lit. The display clock is more accurate with using real-time clock, RTC and control by PIC16F877.

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