Last Updated: 23/09/2021

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Functions Lesson 4 - tone() and noTone() with piezo speaker

Functions >> Functions Lesson 4 - tone() and noTone() with piezo speaker

Lesson Contents

Using tone() to create a signal for a piezo speaker
Using noTone() to stop the sound
Using tone() with a tone time length
Using tone() and a an LED independently with millis() timers

Circuit

Circuit:

Piezo speaker + to Pin 8

Piezo speaker - to Gnd

Example 1: ToneV1.ino

Click to Download code:ToneV1.ino

Simple use of tone() and noTone() functions

 
/*
  
 23/09/2021
 ToneV1

 Basics of using tone() and noTone() with piezo speaker

 Circuit:
 Speaker+ to pin 8 (TonePin)
 Speaker- to Gnd

 Minimum Frequency = 31
 Maximum Frequency = 65535 (This is why it needs to be an unsigned int).

 Maximum usuable frequency on a piezo speaker about 10000

*/
const int tonePin = 8;
unsigned int myLowTone = 31;//minimum frequency
unsigned int myHighTone = 10000;



void setup() {
  Serial.begin(9600);
  Serial.println("ToneV1");
  tone(tonePin, myLowTone);
  //wait 2 seconds
  delay(2000);
  //Turn the noise off
  noTone(tonePin);
  delay(1000);
  tone(tonePin, myHighTone);
  //wait 2 seconds
  delay(2000);
  //Turn the noise off with noTone() function
  noTone(tonePin);
}

void loop() {
  //Uncomment the block below to cycle through tones with set time lengths.
  /*
  int q;
  //q+= 100 increments q by 100 
  for(q=31;q<10000;q+= 100){
  //create a tone of frequency q for 100 miliseconds (0.1) seconds
    tone(tonePin, q,100);
    Serial.println(q);
    //delay is not stopping the sound
    delay(200);  
  }
 */
}

 

Example 2: ToneV2.ino

Using tone with and LED using millis() timer

Click to Download code:ToneV2.ino

 

 
/*
  
 23/09/2021
 ToneV2
Using tone() with a millis() timer alongside and led flashing/sounding at different rates
 
 Circuit:
 Speaker+ to pin 8 (TonePin)
 Speaker- to Gnd

 Minimum Frequency = 31
 Maximum Frequency = 65535 (This is why it needs to be an unsigned int).

 Maximum usuable frequency on a piezo speaker about 10000

*/
const int TonePin = 8;
const int ledPin = 13;//use the UNO built in LED

//see Lesson 7 - delay() and millis() http://www.digitaltown.co.uk/lesson7delaymillis.php
//for information on using millis() as a timer instead of delay()
unsigned long ledTimer;
unsigned long soundTimer;
int ledState;

void setup() {
  Serial.begin(9600);
  Serial.println("ToneV2");
  pinMode(ledPin,OUTPUT);
}

void loop() {
  
  if(millis() > soundTimer){
    soundTimer = millis() + 1000;
    tone(TonePin, 500,800);//tone of 500 for 0.8 seconds 800 milliseconds
  }
  
  if(millis() > ledTimer){
    ledTimer = millis() + 200;
    if(ledState > 0){
      ledState = 0;
      digitalWrite(ledPin,LOW);
    }else{
      ledState = 1;
      digitalWrite(ledPin,HIGH);
    }
    
  }
  
  /*
  int q;
  //q+= 100 increments q by 100 
  for(q=31;q<10000;q+= 100){
  //create a tone of frequency q for 100 miliseconds (0.1) seconds
    tone(TonePin, q,100);
    Serial.println(q);
    //delay is not stopping the sound
    delay(200);  
  }
  */
}

Additional Resource Links

Don't forget to use the Reference in you Arduino IDE for more help on this lesson see tone()

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