iot-printer

This is the code that powers a daily memo printer.

Parts

• Mini Thermal Receipt Printer Starter Kit
• ESP-8266 NodeMCU development board
• Metal Pushbutton with LED Ring

Client

You can find the arduino code in the client folder. Change the backend url to your server url and flash the code to your arduino.

Server

The backend of this project is a flask server. It generates the memo in the format of a Jinja2 templated html page. It then converts this html page into a png image of the correct width for a printer using wkhtmltoimage. The image is then converted to a bitmap image and sent to the printer in json format in small chunks.

To run the server, first install wkhtmltopdf

Then start the flask server:

cd server
export FLASK_ENV=development
export FLASK_APP=app.py
flask run

• note: you might have to install some dependencies using pip install