Arduino的教學07-利用HC-SR04 超音波模組測量距離

一、教學目標:HC-SR04 超音波模組測量距離-led閃爍

Ultrasonic Ranging Module HC - SR04

Working Voltage: DC 5 V 

Working Current: 15mA 

Working Frequency: 40Hz 

Max Range: 4m 

Min Range: 2cm 

MeasuringAngle: 15 degree 

Trigger Input Signal: 10uS TTL pulse 

Echo Output Signal: Input TTL lever signal and the range in proportion 

Dimension: 45*20*15mm

二、佈線圖

三、程式碼

#define TrigPIN 13
#define EchoPIN 12
#define LED1 8
#define LED2 9

void setup() {
  pinMode(TrigPIN, OUTPUT);
  pinMode(EchoPIN, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
    float duration, distance;
  digitalWrite(TrigPIN, HIGH);
  delayMicroseconds(1000);
  digitalWrite(TrigPIN, LOW);
  duration = pulseIn (EchoPIN, HIGH);//pulseIn ( ) ：讀取一個針腳的脈衝時間（HIGH或LOW)
  distance = (duration/2)/29;

  
  if (distance <= 100) {
    digitalWrite(LED1, HIGH);
    delay(distance*1.5 + 10);
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, HIGH);
    delay(distance*1.5 + 10);
    digitalWrite(LED2, LOW);
  }
  
  delay(100);
}

四、作業
1.請將此系統改裝成車雷達(小於一段距離時)產生聲音

五、參考資料
https://eportal.stust.edu.tw/eshare/EshareFile/2014_5/2014_5_c185d20a.pdf
http://blog.lyhdev.com/2012/10/arduino-1hc-sr04.html