Tag: GPIO

This article explains how to use a button as a digital input on ESP32 with Arduino, including hardware wiring, debouncing techniques, and a practical example to control an LED.

This article demonstrates how to build a classic LED chaser (running light) circuit with ESP32, including several implementation methods and code optimizations.

This article demonstrates how to control ESP32 GPIO output to light up and blink an LED, providing a hands-on introduction to ESP32 hardware programming using Arduino.

Running out of GPIO pins on your ESP32? This guide shows you how to use the PCF8574 I2C GPIO expander to add up to 64 extra I/O pins via a two-wire bus, covering wiring, address config, LED control, button input, interrupts, and matrix keypads.

This guide explains three high-impact ESP32 GPIO pitfalls, including restricted pins, floating inputs, and unstable reset design, with practical ESP-IDF code and hardware rules you can apply immediately.