E-Ink Display QR Code Project

Overview

This project enables displaying QR codes on a 2.9-inch E-Ink display using Jetson GPIO and the EPD (E-Paper Display) driver. It's designed to work on Jetson-based systems and provides a complete solution for rendering images on e-ink displays.

Project Structure

• epd2in9bc.py - Driver module for the 2.9" B/C color e-ink display
• epdconfig.py - Configuration file for display settings and GPIO pin mappings
• image_script.py - Main script to load and display QR code images on the e-ink display
• requirements.txt - Python package dependencies

Requirements

• Python 3.7+
• 2.9" E-Ink B/C display (epd2in9bc)
• GPIO library support

Installation

1. Set up Virtual Environment

python3 -m venv myvenv
source myvenv/bin/activate

2. Install Dependencies

pip install -r requirements.txt

Dependencies include:

• Pillow - For image processing and QR code rendering
• Jetson.GPIO - GPIO control for Jetson devices
• gpiozero - GPIO abstraction layer
• spidev - SPI device interface for display communication

Usage

Running the Display Script

To display a QR code on the e-ink display:

source myvenv/bin/activate
python3 image_script.py

The script will:

1. Initialize the e-ink display
2. Clear any existing content
3. Load the QR code image from "qr.png"
4. Display the QR code on the e-ink display

Prerequisites for Running

• Ensure you have a file named qr.png in the project directory (or modify image_script.py to load a different image)
• Verify GPIO pins are properly connected to your e-ink display
• Run with appropriate permissions (may require sudo depending on GPIO settings)

Display Specifications

• Model: epd2in9bc (2.9-inch B/C color)
• Resolution: 296×128 pixels
• Colors: Black, White, and one additional color (typically Red)
• Interface: SPI

Configuration

To modify display settings or GPIO pin mappings, edit epdconfig.py. The configuration includes:

• SPI bus settings
• GPIO pin assignments
• Display initialization parameters

Troubleshooting

• If the display doesn't initialize, verify GPIO pin connections
• Check that all dependencies are installed: pip list
• Ensure the QR code image file exists and is readable
• Review GPIO permissions if running into permission errors