Ultrasonic Module HC-SR04

HC-SR04 Ultrasonic Ranging Sensor Ultrasonic Module For Arduino

Description:

Working Voltage : 5V(DC)
Static Current: Less than 2mA
Output Signal: Electric frequency signal, high level 5V, low level 0V
Sensor Angle: Not more than 15 degrees
Detection Distance: 2cm-450cm
High Precision: Up to 0.3cm
Input Trigger Signal: 10us TTL impulse
Echo Signal : output TTL PWL signal
Quantity: 2

Mode of connection:

VCC
trig(T)
echo(R)
GND

ตัวอย่าง Code

Load library NewPing.h ที่นี่ >> http://www.instructables.com/id/Ultrasonic-Range-detector-using-Arduino-and-the-SR/

// ---------------------------------------------------------------------------

// Example NewPing library sketch that does a ping about 20 times per second.

// ---------------------------------------------------------------------------

#include

#define TRIGGER_PIN  12  // Arduino pin tied to trigger pin on the ultrasonic sensor.

#define ECHO_PIN     11  // Arduino pin tied to echo pin on the ultrasonic sensor.

#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {

  Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.

}

void loop() {

  delay(50);                      // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.

  unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).

  Serial.print("Ping: ");

  Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance in cm and print result (0 = outside set distance range)

  Serial.println("cm");

}