SolderHub Editorial
Articles &
Guides
In-depth tutorials, component deep-dives, and hardware engineering insights — written for builders.
Page 11
ESP32 Pinout Guide: Every GPIO, ADC, PWM, and Restricted Pin Explained
Complete ESP32 pinout guide covering all GPIOs, input-only pins, strapping pins, flash-reserved pins, dual ADC channels, PWM via LEDC, I2C, SPI, UART, and deep sleep wake pins.
Raspberry Pi GPIO Pinout: The Ultimate Reference
A comprehensive map of the 40-pin GPIO header on Raspberry Pi 4, 5, and Zero.
Ultimate Arduino Mega 2560 Pinout Guide: Complete Power & I/O Reference
Master the Arduino Mega 2560 pinout. Detailed reference for all 54 digital pins, 16 analog inputs, PWM, UARTs, SPI, I2C, interrupts, and power. Includes a printable table and practical wiring tips.
Arduino Uno R3 vs R4 Comparison.
What actually changed between the Uno R3, R4 Minima and R4 WiFi, including the pin-current catch nobody mentions, and which board fits your project.
Arduino Nano Pinout: Every Pin Explained (Digital, Analog, PWM, Power)
Complete Arduino Nano pinout reference: all 14 digital pins, 8 analog inputs (including the Nano-only A6/A7), PWM, UART, SPI, I2C, and power rails explained with wiring tips and common mistakes.
ESP32-CAM Web Server: Stream Live Video in 5 Minutes
A complete, no-guesswork walkthrough for flashing an AI-Thinker ESP32-CAM as a live MJPEG video stream -- wiring, Arduino IDE setup, the CameraWebServer sketch, and every failure mode that actually causes problems.
ESP32 MQTT Tutorial: Publish and Subscribe with Arduino IDE
A complete, broker-agnostic ESP32 MQTT tutorial -- topics, QoS, retained messages, Last Will and Testament, TLS security for production, and a working publish/subscribe example with PubSubClient.
Installing ESP8266 in Arduino IDE: NodeMCU (ESP-12E) Complete Setup Guide for Windows
From driver headaches to a blinking LED — the full Windows walkthrough for getting NodeMCU ESP8266 boards running in Arduino IDE, plus notes for Mac and the bare ESP-01 module.
How to Use MQTT with ESP32 and Home Assistant — Complete Beginner Guide
MQTT is the backbone of most smart home systems. This guide shows you how to set up an MQTT broker, connect ESP32, and integrate with Home Assistant from scratch.
Interfacing HC-SR04 Ultrasonic Sensor with Arduino
Build a clean, accurate distance meter with an Arduino Uno, an HC-SR04 ultrasonic sensor, and an I2C 1602 LCD — just four wires to the display, complete code, and the theory behind every line.
Building a Python Flask Server on Raspberry Pi: A Complete Beginner-Friendly Walkthrough
Step-by-step: run a Flask web server on Raspberry Pi to control GPIO pins from any browser — with autostart on boot.
Raspberry Pi GPIO Complete Guide: Pinout, PWM, I2C, and Real Examples
The Raspberry Pi GPIO header has 40 pins — but they're not all the same. This guide covers the pinout, programming in Python, PWM, I2C, SPI, and common mistakes beginners make.