The app
Utilizes the Python3 port of the original Adafruit Python-Thermal-Printer library. Added this to get PIL compatible with python3 and got the image to scale to the size of the reciept paper instead of just cropping everything that didn't fit
Install Raspbian (I used raspian lite so there would be lower overhead and it would be more stable)
Wire the printer according to this. Don't mess this up! I powered the printer with the GPIO pins as well.
Run a test to see if the printer is working by punching in these commands into the terminal.
stty -F /dev/serial0 19200
echo -e "This is a test.\\n\\n\\n" > /dev/serial0
Update the system and install prequisities.
sudo apt-get update
sudo apt-get install git cups wiringpi build-essential libcups2-dev libcupsimage2-dev python3-serial nodejs python3-pil python3-unidecode npm
Install the printer driver. Don't worry about the warnings that g++ gives.
git clone https://github.com/adafruit/zj-58
cd zj-58
make
sudo ./install
Make the printer the default printer. This is useful if you are going to be doing other things with it.
sudo lpadmin -p ZJ-58 -E -v serial:/dev/serial0?baud=19200 -m zjiang/ZJ-58.ppd
sudo lpoptions -d ZJ-58
Restart the pi
sudo reboot
Clone this repository and try to run some tests
git clone https://github.com/Nathanllee1/PrinterCode.git
cd PrinterCode
python3 image.py testPictures/testImage.jpg
python3 printertest.py
Copy credentials.json.template into a file named credentials.json and fill out your firebase user id
We will have the app automatically fill it in later
Let me know if you have any issues.