Raspberry Pi - Potentiometer Piezo Buzzer

This tutorial instructs you how to use Raspberry Pi and potentiometer to control piezo buzzer. In detail:

Hardware Preparation

1×Raspberry Pi 4 Model B
1×Potentiometer
1×ADS1115 ADC Module
1×Piezo Buzzer
1×Breadboard
1×Jumper Wires
1×(Optional) Screw Terminal Adapter for Raspberry Pi

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
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Overview of Piezo Buzzer and Potentiometer

If you are unfamiliar with piezo buzzer and potentiometer (including pinout, functioning, and programming), the following tutorials can help:

Wiring Diagram

The wiring diagram between Raspberry Pi and Potentiometer Piezo Buzzer

This image is created using Fritzing. Click to enlarge image

Raspberry Pi Code - Simple Sound

Detailed Instructions

  • Make sure you have Raspbian or any other Raspberry Pi compatible operating system installed on your Pi.
  • Make sure your Raspberry Pi is connected to the same local network as your PC.
  • Make sure your Raspberry Pi is connected to the internet if you need to install some libraries.
  • If this is the first time you use Raspberry Pi, See how to set up the Raspberry Pi
  • Connect your PC to the Raspberry Pi via SSH using the built-in SSH client on Linux and macOS or PuTTY on Windows. See to how connect your PC to Raspberry Pi via SSH.
  • Make sure you have the RPi.GPIO library installed. If not, install it using the following command:
sudo apt-get update sudo apt-get install python3-rpi.gpio
  • Install the Adafruit_ADS1x15 library by running the following commands on your Raspberry Pi terminal:
sudo pip install Adafruit-ADS1x15
  • Create a Python script file potentiometer_buzzer.py and add the following code:
# This Raspberry Pi code was developed by newbiely.com # This Raspberry Pi code is made available for public use without any restriction # For comprehensive instructions and wiring diagrams, please visit: # https://newbiely.com/tutorials/raspberry-pi/raspberry-pi-potentiometer-piezo-buzzer import time import RPi.GPIO as GPIO import Adafruit_ADS1x15 # Constants ADC_CHANNEL = 0 # Analog channel on ADS1015 GAIN = 1 # Gain (1, 2/3, 1, 2, 4, 8, 16) BUZZER_PIN = 23 # Raspberry Pi GPIO pin connected to the piezo buzzer # Threshold for triggering the buzzer THRESHOLD = 700 # Adjust this value based on your requirement # Setup GPIO GPIO.setmode(GPIO.BCM) GPIO.setup(BUZZER_PIN, GPIO.OUT) # Create ADS1x15 instance ads = Adafruit_ADS1x15.ADS1015() try: while True: # Read the raw ADC value from the potentiometer pot_value = ads.read_adc(ADC_CHANNEL, gain=GAIN) # Trigger the buzzer if the analog value is greater than the threshold if pot_value > THRESHOLD: GPIO.output(BUZZER_PIN, GPIO.HIGH) else: GPIO.output(BUZZER_PIN, GPIO.LOW) print(f"Potentiometer Value: {pot_value}") time.sleep(0.1) except KeyboardInterrupt: GPIO.output(BUZZER_PIN, GPIO.LOW) # Turn off the buzzer before cleanup GPIO.cleanup()
  • Save the file and run the Python script by executing the following command in the terminal:
python3 potentiometer_buzzer.py
  • Turn the potentiometer knob.
  • Listen to the sound coming from the piezo buzzer.

The script runs in an infinite loop continuously until you press Ctrl + C in the terminal.

Code Explanation

Check out the line-by-line explanation contained in the comments of the source code!

Raspberry Pi plays the melody of the song

Let play the "Jingle Bells" melody when the potentiometer is turned to a threshold value.

Detailed Instructions

  • Create a Python script file potentiometer_buzzer_song.py and add the following code:
# This Raspberry Pi code was developed by newbiely.com # This Raspberry Pi code is made available for public use without any restriction # For comprehensive instructions and wiring diagrams, please visit: # https://newbiely.com/tutorials/raspberry-pi/raspberry-pi-potentiometer-piezo-buzzer import time import RPi.GPIO as GPIO import Adafruit_ADS1x15 # Constants ADC_CHANNEL = 0 # Analog channel on ADS1015 GAIN = 1 # Gain (1, 2/3, 1, 2, 4, 8, 16) BUZZER_PIN = 23 # Raspberry Pi GPIO pin connected to the piezo buzzer # Threshold for triggering the buzzer THRESHOLD = 700 # Adjust this value based on your requirement # Setup GPIO GPIO.setmode(GPIO.BCM) GPIO.setup(BUZZER_PIN, GPIO.OUT) # Create ADS1x15 instance ads = Adafruit_ADS1x15.ADS1015() # Constants for note names and their corresponding frequencies C4 = 261 D4 = 293 E4 = 329 F4 = 349 G4 = 392 A4 = 440 B4 = 493 # Dictionary to map numeric values to note names note_names = { C4: "C4", D4: "D4", E4: "E4", F4: "F4", G4: "G4", A4: "A4", B4: "B4", } # List of notes in the "Jingle Bells" melody melody = [ E4, E4, E4, E4, E4, E4, E4, G4, C4, D4, E4, F4, F4, F4, F4, F4, E4, E4, E4, E4, E4, D4, D4, E4, D4, G4 ] # List of note durations (in milliseconds) note_durations = [ 200, 200, 400, 200, 200, 400, 200, 200, 200, 200, 200, 200, 200, 400, 200, 200, 200, 200, 200, 200, 200, 200, 200, 400, 200, 200 ] # Pause duration between notes (in milliseconds) pause_duration = 300 def play_tone(pin, frequency, duration): # Calculate the period based on the frequency period = 1.0 / frequency # Calculate the time for half of the period half_period = period / 2.0 # Calculate the number of cycles for the given duration cycles = int(duration / period) for _ in range(cycles): # Set the GPIO pin to HIGH GPIO.output(pin, GPIO.HIGH) # Wait for half of the period time.sleep(half_period) # Set the GPIO pin to LOW GPIO.output(pin, GPIO.LOW) # Wait for the other half of the period time.sleep(half_period) def play_jingle_bells(): for i in range(len(melody)): note_duration = note_durations[i] / 1000.0 note_freq = melody[i] note_name = note_names.get(note_freq, "Pause") print(f"Playing {note_name} (Frequency: {note_freq} Hz) for {note_duration} seconds") play_tone(BUZZER_PIN, note_freq, note_duration) time.sleep(pause_duration / 1000.0) GPIO.output(BUZZER_PIN, GPIO.LOW) try: while True: # Read the raw ADC value from the potentiometer pot_value = ads.read_adc(ADC_CHANNEL, gain=GAIN) # Trigger the buzzer if the analog value is greater than the threshold if pot_value > THRESHOLD: GPIO.output(BUZZER_PIN, GPIO.HIGH) else: GPIO.output(BUZZER_PIN, GPIO.LOW) print(f"Potentiometer Value: {pot_value}") time.sleep(0.1) except KeyboardInterrupt: GPIO.output(BUZZER_PIN, GPIO.LOW) # Turn off the buzzer before cleanup GPIO.cleanup()
  • Save the file and run the Python script by executing the following command in the terminal:
python3 potentiometer_buzzer_song.py
  • Turn the potentiometer.
  • Hear the song from the piezo buzzer.

Code Explanation

Check out the line-by-line explanation contained in the comments of the source code!

Video Tutorial