:tada: first commit, functional traffic light

.cargo/config.toml

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+[build]
+target = "avr-none"
+rustflags = ["-C", "target-cpu=atmega328p"]
+
+[target.'cfg(target_arch = "avr")']
+runner = "ravedude"
+
+[unstable]
+build-std = ["core"]

.gitignore

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+# Rust build artifacts
+/target
+
+# Rust Rover
+.idea/

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
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+dependencies = [
+ "atmega-hal",
+ "avr-device",
+ "avr-hal-generic",
+ "cfg-if",
+ "embedded-hal 1.0.0",
+ "ufmt",
+]
+
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+ "avr-hal-generic",
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+]
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+dependencies = [
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+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "traffic-light-arduino-uno"
+version = "0.1.0"
+dependencies = [
+ "arduino-hal",
+ "embedded-hal 1.0.0",
+ "nb 1.1.0",
+ "panic-halt",
+ "ufmt",
+]
+
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+ "ufmt-write",
+]
+
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+dependencies = [
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+ "quote",
+ "syn",
+]
+
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Cargo.toml

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+[package]
+name = "traffic-light-arduino-uno"
+version = "0.1.0"
+authors = ["Felix Bytow <drako@drako.guru>"]
+edition = "2021"
+license = "MIT"
+
+[[bin]]
+name = "traffic-light-arduino-uno"
+test = false
+bench = false
+
+[dependencies]
+panic-halt = "1.0.0"
+ufmt = "0.2.0"
+nb = "1.1.0"
+embedded-hal = "1.0"
+
+[dependencies.arduino-hal]
+git = "https://github.com/rahix/avr-hal"
+rev = "fafaf587a32a4500239fd073f89d1b9c36b48092"
+features = ["arduino-uno"]
+
+# Configure the build for minimal size - AVRs have very little program memory
+[profile.dev]
+panic = "abort"
+lto = true
+opt-level = "s"
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+debug = true
+lto = true
+opt-level = "s"

LICENSE-MIT

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Felix Bytow
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+traffic-light-arduino-uno
+=========================
+
+This is a simple traffic light in Rust for the _Arduino Uno_.
+
+Without interaction, it stays red. After pressing the button, first the yellow LED is turned on and after a second the
+green LED.
+A green phase lasts for 10 seconds, after which the yellow LED is turned on again. After two seconds the traffic light
+switches back to red.
+
+## Build Instructions
+
+1. Install prerequisites as described in the [`avr-hal` README] (`avr-gcc`, `avr-libc`, `avrdude`, [`ravedude`]).
+
+2. Run `cargo build` to build the firmware.
+
+3. Run `cargo run` to flash the firmware to a connected board. If `ravedude`
+   fails to detect your board, check its documentation at
+   <https://crates.io/crates/ravedude>.
+
+4. `ravedude` will open a console session after flashing where you can interact
+   with the UART console of your board.
+
+[`avr-hal` README]: https://github.com/Rahix/avr-hal#readme
+
+[`ravedude`]: https://crates.io/crates/ravedude
+
+## License
+
+MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)

Ravedude.toml

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+[general]
+board = "uno"
+# After flashing, open the serial console at 57600 baud.
+open-console = true
+serial-baudrate = 57600
+
+# For documentation about this file, check here:
+# https://github.com/Rahix/avr-hal/blob/main/ravedude/README.md#ravedudetoml-format

rust-toolchain.toml

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+[toolchain]
+channel = "nightly-2025-04-27"
+components = ["rust-src"]
+profile = "minimal"

src/main.rs

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+#![no_std]
+#![no_main]
+
+use arduino_hal::delay_ms;
+use panic_halt as _;
+
+#[arduino_hal::entry]
+fn main() -> ! {
+    let dp = arduino_hal::Peripherals::take().unwrap();
+    let pins = arduino_hal::pins!(dp);
+
+    // for some reason without this the builtin LED would always turn on/off together with the red LED.
+    let mut builtin_led = pins.d13.into_output();
+    builtin_led.set_low();
+
+    let mut red_led = pins.d12.into_output();
+    let mut yellow_led = pins.d8.into_output();
+    let mut green_led = pins.d7.into_output();
+
+    let button = pins.d2.into_pull_up_input();
+
+    red_led.set_high();
+    yellow_led.set_low();
+    green_led.set_low();
+
+    loop {
+        if button.is_high() {
+            // signal coming
+            yellow_led.set_high();
+            delay_ms(1000);
+            // green
+            red_led.set_low();
+            yellow_led.set_low();
+            green_led.set_high();
+            delay_ms(10_000);
+            // signal leaving
+            green_led.set_low();
+            yellow_led.set_high();
+            delay_ms(2000);
+            // red
+            yellow_led.set_low();
+            red_led.set_high();
+        }
+    }
+}