The aim of this project was to develop a numeric value display system using P10 dot matrix LED display. The system has to show three numeric parameters, each each two digit integer part and one digit decimal part. For example 32.7 to be displayed. The system had to support serial input at 9600 baud rate . The user should be able to send ASCII value of numbers to be displayed to this system and the system should show them on the led display.
We have chosen 8 bit AVR Microcontroller ATmega8 for this purpose, it was interfaced to three P10 modules that were connected in cascade. ATmega8 received serial input on its RX pin and show them on the matrix led display. The font data of all numbers and the logic to drive the displays all resides in ATmega8 MCU.
This device then can be used to show any numeric parameter in industrial or commercial establishments. The host processor reads sensor value and sends to this system over single serial line.