I2C LCD 1602/2004 Pinout and Wiring
Wiring an I2C-backpack character LCD (1602 or 2004) to an Arduino or ESP32, and finding its I2C address.
Pinout
LM386 Audio Amplifier Pinout Guide
LM386 pinout, how its gain-setting pins work, and a minimal wiring for a battery-powered speaker amp.
7805 Voltage Regulator Pinout and How It Works
A pinout reference for the 7805 linear voltage regulator, including typical capacitor wiring and heat considerations.
Arduino Uno Pinout Explained
A labelled reference guide to every pin on the Arduino Uno and what it does.
ESP32 DevKit Pinout Guide
A reference guide to the ESP32 DevKit’s GPIO layout, including pins to avoid.
Raspberry Pi GPIO Pinout Explained
A labelled reference guide to the Raspberry Pi’s 40-pin GPIO header.
HC-SR04 Ultrasonic Sensor Pinout and Wiring
A pinout and wiring reference for the HC-SR04 ultrasonic distance sensor.
555 Timer IC Pinout and How It Works
555 timer pinout, how the internal comparators and flip-flop actually work, and the wiring mistakes that stop it oscillating.
