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This is a simple coding that display the distance of the obstacle to the sensor. When the sensor is approaching the obstacle, the buzzer will sound at a higher rate.
#include <NewPing.h>
#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.
int distance = sonar.ping_cm(); // Send ping, get ping time in microseconds (uS).
Serial.print("Ping: ");
Serial.print(distance); // Convert ping time to distance in cm and print result (0 = outside set distance range)
if (distance < 35)
digitalWrite(7, HIGH);
digitalWrite(7, LOW);
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