Switch on a LED using Rust when a button is pushed on ESP32

The idea of this article is to explore how to switch on a LED when a push button is pressed. Once it is release the LED is switched off.

Prerequisites

[dependencies]
log = "0.4"
esp-idf-svc = { version = "0.51", features = ["critical-section", "embassy-time-driver", "embassy-sync"] }
esp-idf-hal = "0.45.2"

Code

Now update main.rs and add this code:

use esp_idf_hal::delay::FreeRtos;
use esp_idf_hal::gpio::PinDriver;
use esp_idf_hal::peripherals::Peripherals;


fn main() -> ! {
    esp_idf_svc::sys::link_patches();

    // Bind the log crate to the ESP Logging facilities
    esp_idf_svc::log::EspLogger::initialize_default();

    log::info!("Starting program...");

    // Get ESP-IDF peripherals
    let peripherals = Peripherals::take().unwrap();
    let pins = peripherals.pins;

    let mut led = PinDriver::output(pins.gpio2).unwrap();
    let button = PinDriver::input(pins.gpio35).unwrap();

    loop {
        if button.is_high() {
            log::info!("Switch ON");
            led.set_high().unwrap(); // Switch ON LED
        } else {
            log::info!("Switch OFF");
            led.set_low().unwrap();  // Switch OFF LED
        }
        FreeRtos::delay_ms(100u32);
    }
}

Build and Run

cargo build
espflash flash target/xtensa-esp32-espidf/debug/blink --monitor