Schematic diagram of multi-way switch status display circuit based on C51 single chip microcomputer

Single chip microcomputer STM32L151CCU6

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

1206RGB (single)

As shown in the figure below, P1.0 - P1.3 of AT89S51 MCU is connected to four LEDs L1 - L4, P1.4 - P1.7 are connected with four switches K1 - K4, and the status of the switch is reflected on the LED. . (The switch is closed, the corresponding light is on, the switch is off, and the corresponding light is off).

1 . Connect P1.0 - P1.3 in the "Microcontroller System" area to the L1 - L4 port in the "Eight LED Indicator Module" area;
2 . Connect P1.4 - P1.7 in the "Microcontroller System" area to the K1 - K4 ports in the "4-way toggle switch" area.