Ultrasonic with Buzzer

Other Hardware Sensors
1

I am trying to make the buzzer sound, LEDs light up and servo motor go when something get within 7cm of the ultrasonic. I have the LED's and servo but everything I try for the buzzer I can not get anything to make a sound. What am I doing wrong. I added the one that works without the buzzer 1st. then the one with the buzzer I tried 2nd.

Working LEDs and servo

#include <NewPing.h>
#include <Servo.h>

const int TriggerPin = 6;
const int EchoPin = 7;
const int ServoPin = 9;
const int ledPin = 11;
const int ledPin2 = 13;
const int ledPin3 = 12;

NewPing sonar(TriggerPin, EchoPin);
Servo servo;

void setup() {
Serial.begin(9600);
servo.attach(ServoPin);
}

void loop() {
int cm = sonar.ping_cm();
Serial.println(cm);

if (cm < 7 && cm !=0) {
digitalWrite(ledPin, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
servo.write (180);
delay (1000);
servo.write (110);
delay (2000);
}

else if (cm > 7 ) {
digitalWrite(ledPin, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);
}
}

Working LED's and servo but not the buzzer (which I thought I added right)

#include <NewPing.h>
#include <Servo.h>

const int TriggerPin = 6;
const int EchoPin = 7;
const int ServoPin = 9;
const int ledPin = 11;
const int ledPin2 = 13;
const int ledPin3 = 12;
const int buzzer = 8;

int sound = 2000;

NewPing sonar(TriggerPin, EchoPin);
Servo servo;

void setup() {
Serial.begin(9600);
servo.attach(ServoPin);
pinMode(buzzer, OUTPUT);

}

void loop() {
int cm = sonar.ping_cm();
Serial.println(cm);

if (cm < 7 && cm !=0) {
digitalWrite(ledPin, HIGH);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, HIGH);
sound = 2000;
servo.write (180);
delay (1000);
servo.write (110);
delay (2000);
}

else if (cm > 7 ) {
digitalWrite(ledPin, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);
}
}

2

I can't see your buzzer from here, so I guess you will have to supply a link to the specs of the thing.

Paul

3

I like messing with the ping sensors and have had lots of success. You had several problems that were difficult to relay over the forum I placed notes in the attached modified code to help you.
Move the echoout pin on the ping sensor to pin 2 on the arduino to take advantage of the interrupt feature available to you
The code compiles and should work as you expected. I removed the NewPing.h library because of "blocking code" it contains in favor of the interrupt method of capturing distance.

#include <Servo.h>

const int TriggerPin = 6;
const int EchoPin = 2; //<<<<<<<<<<<<<<<<<<<<<< Move to Pin 2
const int ServoPin = 9;
const int ledPin = 11;
const int ledPin2 = 13;
const int ledPin3 = 12;

Servo servo;

#define read2 bitRead(PIND,2)//faster than digitalRead()  (((value) >> (bit)) & 0x01)
#define read3 bitRead(PIND,3)//faster than digitalRead()  (((value) >> (bit)) & 0x01)

volatile  unsigned long PingTime;
volatile  unsigned long edgeTime;

void PingTimer(){
  uint8_t pin;
  static unsigned long cTime;
  cTime = micros();         // micros() return a uint32_t
  if (read2)edgeTime = cTime; //Pulse went HIGH store the start time
  else { // Pulse Went low calculate the duratoin
    PingTime = (cTime - edgeTime) ; // Calculate the change in time  NOTE: the "% EchoInputCount" prevents the count from overflowing the array look up % remainder calculation 
  }
}
void PingTrigger(int Pin){
  digitalWrite(Pin, LOW);
  delayMicroseconds(1);
  digitalWrite(Pin, HIGH); // Trigger another pulse
  delayMicroseconds(10);
  digitalWrite(Pin, LOW);
}

void setup() {
  Serial.begin(9600);
  servo.attach(ServoPin);
  attachInterrupt(digitalPinToInterrupt(EchoPin), PingTimer, CHANGE );
}

void loop() {
  int cm = PingTime / 29 / 2;// convert round trip time to cm
  Serial.println(cm);

  if (cm < 7 && cm !=0) { 
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin2, HIGH);
    digitalWrite(ledPin3, HIGH);
     servo.write (180);
    delay (1000);
    servo.write (110);
    delay (2000);
  }
  
  else if (cm > 7 ) { 
    digitalWrite(ledPin, LOW);
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW);
  }
  PingTime = 0; // Clear old data
  static unsigned long Timer;
  if ((millis() - Timer) >= (100)) {// Trigger a pulse every 100 ms
    Timer = millis();
      PingTrigger(TriggerPin);
  }
}

Enjoy :slight_smile:
Z