rPiEinkQR

Scan a code or input it via command line and a QR Code is generated, resized, and output to the [Embedded Artists 2.7" screen] (http://www.embeddedartists.com/products/displays/lcd_27_epaper.php) from a raspberry pi

Starting from scratch?

Below are the required libraries for getting started. ImageMagick will install a large amount of libraries to pull from for all different types of images.

• [qrencode] (https://fukuchi.org/works/qrencode/)
  • sudo apt-get install qrencode
• ImageMagick
  • sudo apt-get install imagemagick
• LibFUSE Driver
  • sudo apt-get install libfuse-dev
• git
  • sudo apt-get install git
• [EPD driver] (https://github.com/embeddedartists/gratis)
  • In a suitable directory git clone https://github.com/embeddedartists/gratis.git
• [This repository] (https://github.com/bhive01/rPiEinkQR)
  • In a suitable directory git clone https://github.com/bhive01/rPiEinkQR.git
• [Turn on SPI interface] (https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md)
  • sudo raspi-config
  • 8 Advanced Options > A6 SPI > Enable > Yes (load by default) > OK > Finish
  • sudo reboot
• Python Development
  • sudo apt-get install python-dev
• pip (Python Package Installer)
  • Python 2
    • sudo apt-get install python-pip #will install python 2 if you don't have it
  • Python 3? Visit here
• PIL Python Imaging Library
  • pip install Pillow

EPD Tests and Usage

From: https://github.com/repaper/gratis/tree/master/PlatformWithOS

To Test EPD:

sudo modprobe spi-bcm2708
make rpi-epd_test COG_VERSION=V2
sudo ./driver-common/epd_test 2.7

To Install EPD Driver:

sudo service epd-fuse start	# Start epd-fuse
ls -l /dev/epd			# Check installation of epd, folder should contain many things.

sudo make rpi			# make all targets
sudo make rpi-install   	# install to run on boot

Usage:

sudo python rPiEinkQREPD.py

Barcode Scanners

Most barcode readers are seen as keyboards by the OS. The important part is to have it set to add a newline after each read. This newline will cause the program to proceed with the code. If there are issues, see the following help forums: https://www.raspberrypi.org/forums/viewtopic.php?f=45&t=55100

ePyper

ePpyper is a library built in python to write to these displays, but for some reason it no longer works with the display. It doesn't require installation of the EPD driver because it has its own built-in. I believe it might have been built for the previous version of the screen, which might explain why it doesn't write to the screen itself. epyper will pull in Wiring and Pillow as requirements through pip.

Epyper Installation

• epyper
  • pip install epyper