Experiment 7: Passive Buzzer Module Experiment
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Contents
Arduino
Experimental Phenomenon
- The buzzer sounds once every 1 second.
- The frequency of the buzzer is controlled by a potentiometer.
Circuit Connection
Reference Program
#define Pot A0
#define Buzzer 2
int PotBuffer = 0;
void setup()
{
pinMode(Buzzer,OUTPUT); // Set buzzer pin as output
}
void loop()
{
PotBuffer = analogRead(Pot); // Read ADC value
for(int i = 0 ; i < 100 ; i++) // Loop 100 times
{
digitalWrite(Buzzer,LOW); // Set output to low
delayMicroseconds(PotBuffer); // Delay for PotBuffer microseconds
digitalWrite(Buzzer,HIGH); // Set output to high
delayMicroseconds(100); // Delay for 100 microseconds
}
delay(1000); // Delay for 1000 milliseconds
}
Raspberry Pi
Circuit Connection
Program Execution
Python
- Install the gpiozero library
- You can install the library using the following commands:
sudo apt update sudo apt install python3-gpiozero
- For other systems on the Raspberry Pi, you can install the library using:
sudo pip3 install gpiozero
- Run the following command to view the GPIO pin definitions on the Raspberry Pi:
pinout
- Download the Raspberry Pi reference examples, unzip the files, copy them to your user directory, and run:
cd raspberrypi/7/python_gpiozero python Buzzer.py
- You should now see the Raspberry Pi running the passive buzzer program correctly. To exit, press ctrl+C.
- Command explanation: gpiozero.TonalBuzzer(pin, initial_value, mid_tone, octaves)
- Main parameters:
- pin: GPIO pin number,
- initial_value:
- If None (default), the buzzer's initial state is off.
- You can specify a value between -1 and 1 as the buzzer's initial value.
- mid_tone: Represents the pitch of the device's middle value (0). The default value is "A4".
- octaves: Number of octaves different from the base pitch, with the default base note being A4.
- If 1, it indicates one octave higher than the base note, i.e., A5.
- If -1, it indicates one octave lower than the base note, i.e., A3.
- Main parameters:
- For more commands, please refer to the gpiozero documentation
