#include "KC868.h" KC868 kc868(&Serial2); //create kc868 object void SensorUpdate(uint8_t idx, uint8_t state) { Serial.printf("Sensor %d : %d\n",idx,state); //state ,0:sensor triggered , 1:sensor not triggered } void setup() { Serial.begin(115200); delay(2000); kc868.begin(115200);//begin kc868 with baud 115200 kc868.setSensorChangeHook(SensorUpdate);//set sensor change hook } void loop(){ kc868.poll(); }