GPIO Tutorials

Build a high-current Arduino DC motor reverser using a 4-channel relay module with safe interlock wiring, ideal for a...

Set up an ESP32-C3 DevKit in Arduino IDE, then verify WiFi scanning and BLE 5 notifications for a low-cost IoT node w...

Build a hidden touch switch using an Arduino Nano and TTP223B to toggle a relay through acrylic or wood, for clean en...

Build an ESP32 capacitive soil moisture smart plant monitor that waters only when dry, supports deep sleep battery li...

Build a Raspberry Pi Pico 2W + 2.13 inch e-paper HAT Wi-Fi name badge that stays readable with near-zero idle power, ...

Compare relay modules, NPN transistors, and logic-level MOSFETs with Arduino Nano wiring examples so you choose the r...

Learn Arduino GPIO sinking vs sourcing current with simple LED wiring diagrams and safe current limits so you avoid b...

Compare BBC micro:bit V2 vs Arduino UNO/Nano to choose the best education board for beginners, including built-in fea...

Learn how Arduino microcontrollers and Raspberry Pi Linux boards differ, when to use each (or both), and avoid GPIO v...

Build an Arduino Nano KY-037 double-clap relay switch to toggle a mains lamp with two claps, using simple timing logi...

Build an ESP32-CAM doorbell with an HC-SR501 PIR sensor that snaps a photo on motion, saves to microSD, and sends Wi-...

Build an ESP32 garage door controller with a reed switch and relay for remote open/close and real-time door status al...