Project to build digital doorsign based on ESP32, Waveshare E-Paper-Display (2.9, 4.2 or 7.5 inch). The display can load image from Webserver and uses deep-sleep mode of ESP32 to save energy. Images are generated on Webserver running PHP. Examples in this repository generate a weather-station, a doorsign for an office and a doorsign for a conference room.

To start, you need the Arduino IDE with dependencies installed. Hardware setup is described here: ct.de/yrzv.

The folder 'server' contains examples for content and outputs it in Byte-stream-format for ESP32. Copy the folder on a webserver with PHP installed and GD active (PHP >7.0). In the URL you tell the server what to show (and for which display size):

• /?debug=true&display=7.5&content=weather_station&scale=28 (displays a weather-station for a 7.5 inch display)
• /?debug=true&display=2.9&content=door_sign&scale=22 (displays a door-sign for a 2.9 inch display)
• /?debug=true&display=4.2&content=conference_room&scale=18 (displays a sign for a conference room for a 4.2 inch display)

With Get-Parameter 'scale' you adjust size of the text. Set 'debug' to true to get a png-image and false for byte-Stream for ESP32.

• GxEPD, Basecamp, Adafruit_GFX

This repository is part of article "Ausdauernde Infotafel" from German computer magazine "c't". Link: ct.de/yrzv

• add support for 3-color-display (b/w/r)

• add better examples with real data (like ical-calendar)