Why buzzer keep turning on even i tried to make it off?

Projects General Guidance
1

Im trying to make an automatic water dispenser using Nodemcu esp8266, Ultrasonic sensor, buzzer, relay, and waterpump. Ive tried 2 code but they both cant turn off the buzzer. Im fairly new to arduino, any help would be much appreciated!!!

first code

/* Full video - https://youtu.be/IyywqOiAAZg */

const int pingPin = D0;//d0
const int echoPin = D1;//d1

const int LED1 = D2;//d2
const int BUZZER = D4; //d4
const int LED3 = D5;//d5


void setup() {
  pinMode(LED1 , OUTPUT);
  pinMode(BUZZER , OUTPUT);
  pinMode(LED3 , OUTPUT);
  
   Serial.begin(115200); // Starting Serial Terminal
}

void loop() {
   long duration, distance;
   pinMode(pingPin, OUTPUT);
   digitalWrite(pingPin, LOW);
   delayMicroseconds(2);
   digitalWrite(pingPin, HIGH);
   delayMicroseconds(10);
   digitalWrite(pingPin, LOW);
   pinMode(echoPin, INPUT);
   duration = pulseIn(echoPin, HIGH);
   Serial.print("Distance from the object = ");
   distance = microsecondsToCentimeters(duration);
   
   Serial.print(distance);
   Serial.print("cm");
   Serial.println();
    if ( distance <=  5 )
  {
    digitalWrite(LED1, LOW);
    digitalWrite(BUZZER, HIGH);
    digitalWrite(LED3, HIGH);
  }
  else
  {
    digitalWrite(LED1, HIGH);
    digitalWrite(BUZZER, LOW);
    digitalWrite(LED3, LOW);
  }
  
   delay(100);
}


long microsecondsToCentimeters(long microseconds) {
   return microseconds / 29 / 2;
}

second code

const int trigPin = D0;  // Ultrasonic sensor trig pin
const int echoPin = D1;  // Ultrasonic sensor echo pin
const int buzzerPin = D4;  // Buzzer pin
const int relayPin = D2;  // Relay pin

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Initialize the relay to off state
}

void loop() {
  int duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  if (distance <= 5) { // If the distance is less than or equal to 10 cm
    digitalWrite(relayPin, HIGH); // Turn on the relay (water pump)
    tone(buzzerPin, 1000); // Produce a 1 kHz tone on the buzzer
    delay(2000); // Wait for 2 seconds
    digitalWrite(relayPin, LOW); // Turn off the relay (water pump)
    noTone(buzzerPin); // Stop the buzzer tone
  }
  delay(50000); // Wait for 0.5 seconds before taking the next measurement
  
}
2

Are you sure it's a passive buzzer.
Most buzzers are active, and don't work with tone();

Try writing the buzzerPin HIGH or LOW when needed instead of using tone();

That's 50 seconds, not 0.5 seconds.

Leo..

3

What distance does it report?
Does the led work correct?
Can you post a schematic and a picture of your setup?
You use d1 and d2 for ultrasonic. On uno those are used for serial communication. Not sure if that also holds for this board...

4

Thank you! I just realised that 3v isnt for ultrasonic sensor

5

Thanks!! ive change the microcontroler into arduino nano and it work

6

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.