Circuit
| Arduino | Sensor |
| 5V | 5V (Ultrasonic) |
| GND | GND (Ultrasonic), Black Wire (Buzzer) |
| Pin 12 | Trigger Pin (Ultrasonic) |
| Pin 11 | Echo Pin (Ultrasonic) |
| Pin 8 | Red Wire (Buzzer) |
Download NewPing.zip from here NewPing
Code
#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.
kayar::NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
int tonepin = 8;
int distance;
void setup() {
Serial.begin(9600); // Open serial monitor at 115200 baud to see ping results.
pinMode(tonepin,OUTPUT);
}
void loop()
{
delay(500); // 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: ");
distance=uS / US_ROUNDTRIP_CM;
Serial.print(distance); // Convert ping time to distance in cm and print result (0 = outside set distance range)
Serial.println("cm");
if(distance >0 && distance <10) {
Serial.print("Less Distance");
tone(tonepin,2000,1000);
}
if (distance > 10) {
noTone(8);
}
}