Pico Pico - Embedded Programming with Rust

Beeping with an Active Buzzer

Since you already know how an active buzzer works, we can make it beep by simply turning a GPIO pin on and off. In this exercise, we use a GPIO pin to power the buzzer, wait for a short time, turn it off, and repeat. This creates a clear beeping sound.

Note

This example is meant for an active buzzer. If you use a passive buzzer instead, the sound may be strange or inconsistent. Try this exercise only with an active buzzer.

Hardware Requirements

• Active buzzer
• Jumper wires (female-to-male or male-to-male, depending on your setup)

Project from template

Create a new project:

To set up the project, run:

cargo generate --git https://github.com/ImplFerris/pico2-template.git --tag v0.3.1

When prompted, give your project a name, like “active-beep” and select embassy as the HAL.

Main logic

Ensure the buzzer is connected to GPIO 15. The pin is toggled every 500 milliseconds to turn the buzzer on and off.

#![allow(unused)]
fn main() {
let mut buzzer = Output::new(p.PIN_15, Level::Low);

loop {
    buzzer.set_high();
    Timer::after_millis(500).await;

    buzzer.set_low();
    Timer::after_millis(500).await;
}
}

Clone the existing project

You can clone (or refer) project I created and navigate to the active-beep folder.

git clone https://github.com/ImplFerris/pico2-embassy-projects
cd pico2-embassy-projects/active-beep