You can read the state of a button using Arduino and a few lines of code. The actual state is shown in the Serial Monitor window as 0 or 1, 0 meaning the button is not pressed and 1 that the button is ...

In this example, a simple web server lets you blink an LED via the web. This example will print the IP address of your WiFi Shield (once connected) to the Arduino Software (IDE) serial monitor. Once ...

In it, he shows an example of using all three ESP32 UARTs from an Arduino program. He calls the third port “secret” although that’s really a misnomer.