Here we use 4 wires, but the principle of 3 wires is the same.
The IO port is customized in the program. The one used below is P3^0
#include void main() { while(1) { P2=0xff; //Initialize LED if(P3_0==0) //The sensor detects a flame signal P2=0x00; //LED is fully lit } } wiring: AO: Analog output signal DO: digital output signal This article only uses the digital output signal DO- to connect to P3^0 port, Vcc and Gnd are power supply and ground respectively
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