GPIO Tutorials

Build an ESP32 smart greenhouse using a DHT22, soil moisture sensor, and 2-channel relay to automatically run a fan a...

Compare ESP32 vs ESP8266 in 2026 to pick the right Wi-Fi microcontroller board based on GPIO, Bluetooth, ADC, cost, a...

Build an Arduino IR obstacle sensor trigger that blinks the onboard LED and prints Serial alerts using a simple HIGH/...

Build an Arduino HC-SR04 ultrasonic distance meter that streams live centimetre readings to Serial Monitor for fast p...

Build an Arduino Pro Micro push-button USB HID macro pad that sends real key presses (F13 to F16) for custom shortcut...

Set up a Wemos D1 Mini ESP8266 in the Arduino IDE to blink the on-board LED and connect to Wi-Fi while printing its I...

Build Arduino HC-05 Bluetooth Classic wireless serial control to send phone commands and toggle an LED, using Softwar...

Wire a 4x4 membrane keypad to an Arduino and read key presses in the Serial Monitor, plus a simple passcode check usi...

Build Arduino NRF24L01 wireless communication between two boards over SPI, send text, control LEDs, and tune range fo...

Build an Arduino Uno 1602 LCD Keypad Shield UI to read button presses, scroll text, and render custom characters for ...

Build an Arduino Uno KY-006 passive buzzer circuit that plays two tones using simple pulse timing, perfect for learni...

Build a Raspberry Pi Pico W ULN2003 stepper controller to drive a 28BYJ-48 motor with MicroPython, using safe externa...