Red Ultrasonic 5 PIN

Red Ultrasonic 5 PIN

#define TRIG  A2
#define ECHO A3
 
void setup() { 
  Serial.begin (9600); 
  pinMode(TRIG, OUTPUT); 
  pinMode(ECHO, INPUT); 
} 
 
void loop() { 
  int duration, cm; 
  digitalWrite(TRIG, LOW); 
  delayMicroseconds(2); 
  digitalWrite(TRIG, HIGH); 
  delayMicroseconds(10); 
  digitalWrite(TRIG, LOW); 
  duration = pulseIn(ECHO, HIGH); 
  cm = duration / 58;
  Serial.print(cm); 
  Serial.println(" cm"); 
  delay(50);
}