LED dot matrix writing screen (contains PROTEUS files, PROTEL schematic diagram, PCB, assembly program)

The structure of the LED dot matrix writing screen system is shown in Figure 1. Under the management of the controller, the LED dot matrix module display screen works in the scanning micro-brightness mode that is imperceptible to the human eye and the display lighting mode that is visible to the human eye; when the light pen touches the surface of the LED dot matrix module, the touch position is first detected by the light pen The LED point at the position is scanned and dimly lit to obtain its row and column coordinates, and then based on the functional requirements, it is decided whether the LED at the coordinate is lit to a display state visible to the human eye (as shown in Figure 1, the deep red LED point at the point where the light pen is touched has been lit) ), thereby realizing writing display functions such as "lighting, stroking, inverting, entire screen erasing, stroke erasing, continuous writing of multiple words, and object dragging" on the screen.