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.. _1.2.2_py_pi5:
1.2.2 Passive Buzzer
=====================
Introduction
------------
In this project, we will learn how to make a passive buzzer play music.
Required Components
------------------------------
In this project, we need the following components.
.. image:: ../python_pi5/img/1.2.2_passive_buzzer_list.png
.. raw:: html
Schematic Diagram
-----------------
In this experiment, a passive buzzer, a NPN transistor and a 1k resistor
are used between the base of the transistor and GPIO to protect the
transistor.
When GPIO17 is given different frequencies, the passive buzzer will emit
different sounds; in this way, the buzzer plays music.
============ ======== ======== ===
T-Board Name physical wiringPi BCM
GPIO17 Pin 11 0 17
============ ======== ======== ===
.. image:: ../python_pi5/img/1.2.2_passive_buzzer_schematic.png
Experimental Procedures
-----------------------
**Step 1**: Build the circuit. (The Passive buzzer with green circuit board on the back.)
.. image:: ../python_pi5/img/1.2.1_ActiveBuzzer_circuit.png
**Step 2: Change directory.**
.. raw:: html
.. code-block::
cd ~/davinci-kit-for-raspberry-pi/python-pi5
**Step 3: Run.**
.. raw:: html
.. code-block::
sudo python3 1.2.2_PassiveBuzzer.py
The code run, the buzzer plays a piece of music.
.. warning::
If there is an error prompt ``RuntimeError: Cannot determine SOC peripheral base address``, please refer to :ref:`faq_soc`
**Code**
.. note::
You can **Modify/Reset/Copy/Run/Stop** the code below. But before that, you need to go to source code path like ``davinci-kit-for-raspberry-pi/python-pi5``. After modifying the code, you can run it directly to see the effect.
.. raw:: html
.. code-block:: python
#!/usr/bin/env python3
from gpiozero import TonalBuzzer
from time import sleep
# Initialize a TonalBuzzer connected to GPIO pin 17
tb = TonalBuzzer(17) # Update this pin number based on your setup
def play(tune):
"""
Play a musical tune using the buzzer.
:param tune: List of tuples (note, duration), where each tuple represents a note and its duration.
"""
for note, duration in tune:
print(note) # Output the current note being played
tb.play(note) # Play the note on the buzzer
sleep(float(duration)) # Delay for the duration of the note
tb.stop() # Stop playing after the tune is complete
# Define a musical tune as a sequence of notes and durations
tune = [('C#4', 0.2), ('D4', 0.2), (None, 0.2),
('Eb4', 0.2), ('E4', 0.2), (None, 0.6),
('F#4', 0.2), ('G4', 0.2), (None, 0.6),
('Eb4', 0.2), ('E4', 0.2), (None, 0.2),
('F#4', 0.2), ('G4', 0.2), (None, 0.2),
('C4', 0.2), ('B4', 0.2), (None, 0.2),
('F#4', 0.2), ('G4', 0.2), (None, 0.2),
('B4', 0.2), ('Bb4', 0.5), (None, 0.6),
('A4', 0.2), ('G4', 0.2), ('E4', 0.2),
('D4', 0.2), ('E4', 0.2)]
try:
play(tune) # Execute the play function to start playing the tune
except KeyboardInterrupt:
# Handle KeyboardInterrupt for graceful termination
pass
**Code Explanation**
#. These lines import the ``TonalBuzzer`` class from the ``gpiozero`` library for buzzer control and the ``sleep`` function from the ``time`` module for creating delays.
.. code-block:: python
#!/usr/bin/env python3
from gpiozero import TonalBuzzer
from time import sleep
#. This line initializes a ``TonalBuzzer`` object on GPIO pin 17.
.. code-block:: python
# Initialize a TonalBuzzer connected to GPIO pin 17
tb = TonalBuzzer(17) # Update this pin number based on your setup
#. The ``play`` function iterates over a list of tuples representing musical notes and their durations. Each note is played for its specified duration, and the buzzer stops after completing the tune.
.. code-block:: python
def play(tune):
"""
Play a musical tune using the buzzer.
:param tune: List of tuples (note, duration), where each tuple represents a note and its duration.
"""
for note, duration in tune:
print(note) # Output the current note being played
tb.play(note) # Play the note on the buzzer
sleep(float(duration)) # Delay for the duration of the note
tb.stop() # Stop playing after the tune is complete
#. The tune is defined as a sequence of notes (frequency) and durations (seconds).
.. code-block:: python
# Define a musical tune as a sequence of notes and durations
tune = [('C#4', 0.2), ('D4', 0.2), (None, 0.2),
('Eb4', 0.2), ('E4', 0.2), (None, 0.6),
('F#4', 0.2), ('G4', 0.2), (None, 0.6),
('Eb4', 0.2), ('E4', 0.2), (None, 0.2),
('F#4', 0.2), ('G4', 0.2), (None, 0.2),
('C4', 0.2), ('B4', 0.2), (None, 0.2),
('F#4', 0.2), ('G4', 0.2), (None, 0.2),
('B4', 0.2), ('Bb4', 0.5), (None, 0.6),
('A4', 0.2), ('G4', 0.2), ('E4', 0.2),
('D4', 0.2), ('E4', 0.2)]
#. The ``play(tune)`` function is called inside a ``try`` block. A ``KeyboardInterrupt`` (like Ctrl+C) will stop the program gracefully.
.. code-block:: python
try:
play(tune) # Execute the play function to start playing the tune
except KeyboardInterrupt:
# Handle KeyboardInterrupt for graceful termination
pass