Physical Computing with Rust

Now you're able to control an output component (an LED), let's connect and control an input component: a button.

• Connect a button to another GND pin and GPIO pin 22, like this:

  

• This time you'll need the Button component, and to tell it that the button is on pin 22. Edit the examples/button.rs file and write the following code in your new file:

extern crate rust_gpiozero;
use rust_gpiozero::*;

fn main() {
    // Create a button which is attached to Pin 22
    let button = Button::new(22);
}

• Now you can get your program to do something when the button is pushed. Add these lines:

# #![allow(unused_variables)]
#fn main() {
button.wait_for_press();
println!("button pressed");
#}

• The code should look like this:

extern crate rust_gpiozero;
use rust_gpiozero::*;

fn main() {
    // Create a button which is attached to Pin 22
    let button = Button::new(22);

    // Wait for button to be pressed
    button.wait_for_press();

    // Message to display when button is pressed
    println!("button pressed");
}

• Save the file and run the code with:

cargo run --example button

• Press the button and your text will appear.