Using a Buzzer with Smart Pi One

This page describes how to connect and use a buzzer with the Smart Pi One, including wiring instructions, and code examples in both Python and C.

Required Materials

• Smart Pi One
• Active or passive buzzer
• Connecting wires
• Breadboard (optional for easier connections)

Wiring Diagram

Below is a sample wiring diagram for connecting a buzzer to the Smart Pi One:

Component	Smart Pi One Pin	Description
Buzzer (positive terminal)	GPIO7	Connect to the positive terminal of the buzzer
Buzzer (negative terminal)	GND	Connect to the ground (GND) pin

Connecting the Buzzer

1. Connect the Buzzer:
2. Connect the positive terminal of the buzzer to a GPIO pin on the Smart Pi One (e.g., GPIO7).
3. Connect the negative terminal of the buzzer to the ground (GND) pin on the Smart Pi One.

Using Python

Prerequisites: Configuration of smartpi-gpio

To install SmartPi-GPIO on your Smart Pi One, follow these steps:

1. Update system: ```bash sudo apt update sudo apt-get install -y python3-dev python3-pip libjpeg-dev zlib1g-dev libtiff-dev sudo mv /usr/lib/python3.11/EXTERNALLY-MANAGED /usr/lib/python3.11/EXTERNALLY-MANAGED.old

2. Clone the repository: ```bash git clone https://github.com/ADNroboticsfr/smartpi-gpio.git cd smartpi-gpio

3. Install the library: ```bash sudo python3 setup.py sdist bdist_wheel sudo pip3 install dist/smartpi_gpio-1.0.0-py3-none-any.whl

4. Activate GPIO interfaces: bash sudo activate_interfaces.sh

Creating the Python Script

1. Open a terminal on your Smart Pi One.
2. Create a new Python file using nano:

nano buzzer_control.py

1. Copy and paste the following Python code into the file:

import time
from smartpi_gpio.gpio import GPIO

# Initialize GPIO
gpio = GPIO()
BUZZER_PIN = 7

# Set GPIO7 as output for the buzzer
gpio.setup(BUZZER_PIN, gpio.OUT)

try:
    while True:
        # Turn the buzzer on
        gpio.output(BUZZER_PIN, gpio.HIGH)
        print("Buzzer ON")
        time.sleep(1)  # Buzzer stays on for 1 second

        # Turn the buzzer off
        gpio.output(BUZZER_PIN, gpio.LOW)
        print("Buzzer OFF")
        time.sleep(1)  # Buzzer stays off for 1 second
except KeyboardInterrupt:
    pass
finally:
    gpio.cleanup()  # Clean up GPIO

1. Save the file by pressing CTRL + X, then Y, and finally Enter.

Running the Python Script

To run the Python script, use the following command:

python3 buzzer_control.py

Using a C Program

Creating the C Program

1. Open a terminal on your Smart Pi One.
2. Create a new C file using nano:

nano buzzer_control.c

1. Copy and paste the following C code into the file:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "smartpi_gpio.h"

int main() {
    // Initialize GPIO
    smartpi_gpio_init();
    int BUZZER_PIN = 7;

    // Set GPIO7 as output for the buzzer
    smartpi_gpio_set_mode(BUZZER_PIN, OUTPUT);

    while (1) {
        // Turn the buzzer on
        smartpi_gpio_write(BUZZER_PIN, HIGH);
        printf("Buzzer ON\n");
        sleep(1);  // Buzzer stays on for 1 second

        // Turn the buzzer off
        smartpi_gpio_write(BUZZER_PIN, LOW);
        printf("Buzzer OFF\n");
        sleep(1);  // Buzzer stays off for 1 second
    }

    // Release GPIO resources (this will never be reached)
    smartpi_gpio_cleanup();
    return 0;
}

1. Save the file by pressing CTRL + X, then Y, and finally Enter.

Compiling and Running the C Program

To compile and run the C program, use the following commands:

gcc -o buzzer_control buzzer_control.c -I/path/to/smartpi_gpio/include -L/path/to/smartpi_gpio/lib -lsmartpi_gpio
./buzzer_control