Physical Computing with Rust

There are two main types of buzzer: active and passive.

A passive buzzer emits a tone when a voltage is applied across it. It also requires a specific signal to generate a variety of tones. The active buzzers are a lot simpler to use, so these are covered here.

An active buzzer can be connected just like an LED, but as they are a little more robust, you won't be needing a resistor to protect them.

Set up the circuit as shown below:

Image source: Raspberry Pi Foundation

• Modify the examples/buzzer.rs file:

  extern crate rust_gpiozero;
  use rust_gpiozero::*;
  use std::thread::sleep;
  use std::time::Duration;
  
  fn main() {
  
  // Tell the Pi which GPIO pin you are using
  let mut buzzer = Buzzer::new(17);    
  
  }
  

• In rust_gpiozero, a Buzzer works exactly like an LED, so try adding a buzzer.on(); and buzzer.off(); into your loop:

  
  # #![allow(unused_variables)]
  #fn main() {
  loop{
      // Make the buzzer switch on
      buzzer.on();
  
      // Wait for one second
      sleep(Duration::from_secs(1));
  
      // Make the buzzer switch off
      buzzer.off();
  
      // Wait for one second
      sleep(Duration::from_secs(1));
      }
  
  #}

• A Buzzer has a beep(on_time,off_time) method which works like an LED's blink. Try it out:

  
  # #![allow(unused_variables)]
  #fn main() {
      // Let the buzzer beep
      buzzer.beep(1,1);
  
  #}