esp8266 接HC-SR501 红外人体检测实验

厂家说明 https://docs.particle.io/assets/datasheets/makerkit/pir-sensor.pdf

一、物料

1. 面包板 x1
2. 无源蜂鸣器 x1
3. 发光二极管 x1
4. esp8266 x1
5. HC-SR501 x1
6. 杜邦线 公对母 x7

二、接线

蜂鸣器 长针接GPIO4针脚，对应D2，短针接G

Led 长针接GPIO5 ,对应D1,短针接3V 

HC-SR501  中间接GPIO13  对应D7，左侧（针脚边缘靠近身体）接3V，右侧（针脚边缘靠近身体）接G

三、源码

int inputPin = 13;   //  ESP8266  d7
int ledOut = 5; //esp8266  D1
//通过PWM脉冲调制控制(无源)蜂鸣器电压的连续改变，实现蜂鸣器的鸣响
#define buzzerOut 4  //esp8266  D2

void setup() {
  pinMode(inputPin, INPUT);
  pinMode(buzzerOut, OUTPUT);   //蜂鸣器
  pinMode(ledOut, OUTPUT);   //led 二极管
  Serial.begin(9600);

  digitalWrite(buzzerOut, LOW);
  digitalWrite(ledOut, LOW);
  delay(30 * 1000);
}

void loop() {
  int val = digitalRead(inputPin);
  if (val == HIGH) {
   
    mingX();
    Serial.println("Motion detected!");
      delay(5000);
  }
  else {
    Serial.println("No Motion detected!");
  }
  delay(100);

}


void  mingX() {
  digitalWrite(buzzerOut, HIGH);//输出HIGH电平,停止发声
  digitalWrite(ledOut, HIGH); //led on
  delay(50); //等待3000毫秒
  digitalWrite(buzzerOut, LOW);//输出LOW电平,发声
  digitalWrite(ledOut, LOW); //led on
}