HC-SR04 Ultrasonic sensor module

• TOSEI says:

  May 3, 2020 at 12:51 pm

  Test is OK.

  >>HARDWARE :
  Osoyoo UNO Board (Fully compatible with Arduino UNO rev.3) x 1
  Breadboard x 1
  HC-SR04 Ultrasonic sensor module x 1
  M/M jumpers
  USB Cable x 1
  PC x 1

  >>Pin Definitions :
  VCC : 3.3V-5V ⇔ UNO 5V
  GND : The Ground　　　　　　　 ⇔　UNO GND
  Trig : I/O Interface of Trig　　⇔　UNO PIN 8
  Echo : I/O Interface of Echo　　⇔　UNO PIN 7

  >>Mixly source :

  volatile int item;

  float checkdistance_8_7() {

  digitalWrite(8, LOW);

  delayMicroseconds(2);

  digitalWrite(8, HIGH);

  delayMicroseconds(10);

  digitalWrite(8, LOW);

  float distance = pulseIn(7, HIGH) / 58.00;

  delay(10);

  return distance;

  }

  void setup()

  {

  item = 0;

  pinMode(8, OUTPUT);

  pinMode(7, INPUT);

  Serial.begin(9600);

  }

  void loop()

  {

  item = checkdistance_8_7();

  Serial.print(“Distance”);

  Serial.println(item);

  delay(1000);

  if (item < 50) {

  Serial.println("Something is very close ! ");

  }

  }

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