7-Segment Display Fun with ESP32 and Embedded Rust 🔢⚡

An embedded Rust experiment driving a 7-segment LED display using an ESP32 and the esp-hal crate.

This is a fun little project to explore #![no_std] development with Rust on ESP32, and how to animate a 7-segment display.

✨ Features

• Count from 0 to F in hexadecimal
• Circular segment animation (circle)
• Snake-style effect across segments (snake_eight)
• Simple sequence lighting demo (sequence)
• Modular display logic

💻 Hardware Requirements

• ESP32 development board
• Common cathode 7-segment LED display
• 8 GPIO-connected resistors (1 per segment)
• Breadboard and jumper wires
• USB cable and UART for flashing

📦 Crates Used

• esp-hal — Hardware Abstraction Layer for ESP chips
• esp-backtrace — for panic handling
• no_std, no_main, #[entry] from esp-hal-macros

🧠 Segment Mapping

 _
|_|
|_|

Segment Indexes:
 1
0 2
 3
4 6
 5   .7 (dot)

🧪 Animations

• count – display digits 0–F one at a time
• snake_eight – animates a snake-like motion over the digit "8"
• circle – moves a lit segment in a circular motion
• sequence – turns on each segment in order

Each function demonstrates basic GPIO manipulation and delay usage in a no_std context.