ESP32 Arduino HTTP server: controlling a relay remotely

In this ESP32 tutorial, we will check how to remotely control a relay using the Arduino core and the HTTP async web server libraries for the ESP32.
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ESP32 Arduino SSD1306 OLED: Drawing a QR Code

The objective of this post is to explain how to draw a QR Code on a SSD1306 OLED display, using the Arduino core on the ESP32. For this tutorial an Elecrow’s version of the OLED was used. The display can be bought here. The ESP32 board used was a NodeMCU.

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