Design of LED Dot Matrix Writing Display Screen

The hardware of this design is consisted of minimum system of STC89C58 MCU,32 x 32 double-color dot matrix display array,light pen,buttons,LCD etc.The red LED in double color dot matrix is always working in slightly bright scanning state.STC89C58 MCU uses the infrared light electric triode of the self-made pen to detect where the red pen is touching and whether the LED lamp lights in that position is on or off.It calculates the coordinate of the pen and control the condition of LED according to the different working modes which are controlled by the buttons,so as to realize functions such as the light,scratched,reverse,screen clearing,stroke drag and display in turn.The screen can automatically adjust the screen brightness according to environmental light.If the screen is not contacted or the buttons are not pressed during the setting time,it would close all show and make the system into dormant to reduce electricity consumption.Pressing the button,the system would recover.