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.
Reference
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.
Best Electronics Textbooks for Serious Hobbyists
Textbook recommendations for hobbyists who want real EE theory beyond tutorials, including Bird and Stroud.
Raspberry Pi Green LED Blink Codes Explained
What each flash pattern of the Raspberry Pi’s green ACT LED means, from a missing bootloader file to an SDRAM failure.
