Simple 7-Segment Display Controller

A Rust-based PlatformIO Arduino project for controlling a 4-digit 7-segment display with incrementing counter functionality. The purpose of this project is to develop a simple PCB, software, and case design as a template for developing hardware devices from ideation to production.

Features

• Efficient multiplexed display using 74HC595 shift registers
• Safe interrupt handling with Mutex
• Hardware abstraction layer for Arduino integration

Circuit Diagram

Breadboard Design

PCB Design

PCB Assembled

Case Design

Hardware Setup

• Arduino Uno R3
• 2x 74HC595 shift registers
• 4-digit 7-segment display (common cathode)
• 2x Ceramic capacitors (100nF)
• 1x 5-pin header for Arduino pins

Prerequisites

• PlatformIO Core (CLI) or PlatformIO IDE

  cargo install cargo-pio

• Rust toolchain with AVR target:

  rustup override set nightly
  rustup target add avr-unknown-gnu-atmega328

• AVR-GCC toolchain

  sudo apt-get install -y gcc-avr binutils-avr avr-libc

Install Dependencies

sudo apt-get install -y python3-venv # If not already installed
cargo install cargo-pio

Building and Flashing

1. Clone the repository:

   git clone https://github.com/sephynox/simple-counter-rs
   cd simple-counter-rs

2. Build the project:

   cargo pio build

3. Flash the firmware to your Arduino Uno:

   cargo pio exec -- run --target upload

How to Create a New Project

cargo pio new --board uno your-project-name

License

This project is licensed under the MIT License - see the LICENSE file for details.