Hands-On Internet of Things with MQTT

Modifying the e-paper example

Now we need to do a couple of changes to the code. Currently the helloWorld function always prints the same text to the display. We want to make it dynamic, first by sending text via the serial port (using the Arduino serial monitor), then via MQTT. We will also make the text bigger by using another font file, rotate the text (so we can display longer words/phrases) and add the possibility to color the text red.

Our e-paper project can be used in various ways, but the main purpose is to attach it to your wall near the flat/house entry door and send text to it via your smartphone or desktop computer. This way, you can remind yourself to bring out the trash or buy groceries and you see it whenever you walk past ...