SolderHub Editorial
Articles &
Guides
In-depth tutorials, component deep-dives, and hardware engineering insights — written for builders.
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Arduino Uno R4 Minima vs WiFi: Which One Should You Choose?
Same processor, same memory, different price. Here's what the WiFi variant's extra hardware actually gets you, and when the Minima is the smarter buy.
ESP32-CAM Pinout: Every GPIO, Free Pins, SD Card & Flash LED Explained
Which ESP32-CAM pins are actually free, which belong to the camera, PSRAM and SD card, and which can stop the board booting. Covers GPIO 16, GPIO 4 and the SD card fix.
What Is Blynk 2.0? Templates, Datastreams, Devices and Dashboards Explained
A beginner-friendly explanation of Blynk 2.0: how templates, devices, datastreams and dashboards fit together, what the free plan really allows, and when to choose Blynk over MQTT or Node-RED.
Arduino Uno R4 WiFi Pinout: Every GPIO, ADC, DAC, and ESP32-S3 Pin Explained
A complete Arduino Uno R4 WiFi pinout reference — digital I/O, ADC, DAC, op-amp, CAN, dual UART, plus the Qwiic bus, LED matrix, ESP header, and OFF/VRTC pins exclusive to this variant.
ESP32 WiFi Tutorial: Connect ESP32 to a WiFi Network (Arduino IDE)
Learn how to connect an ESP32 to WiFi with the Arduino IDE: station and access point modes, a reliable connect-with-timeout sketch, automatic reconnection, signal strength, scanning networks and the mistakes that cause connection failures.
ESP32-CAM Face Detection: Basics of Edge AI
Enable real-time, on-device face detection on the ESP32-CAM using Espressif's official example -- what the board can and can't do, the PSRAM setting almost everyone misses, and the resolution/frame-rate trade-off.
ESP32-CAM Programming & Getting Started
A beginner's guide to setting up the Arduino IDE for the ESP32-CAM, from board manager installation to flashing your first sketch over FTDI.
ESP32-S3 Pinout Guide: GPIO, Dual ADC, Native USB, and PSRAM Pins Explained
A complete ESP32-S3 pinout reference — verified strapping pins, GPIO, dual ADC, PWM, native USB OTG, and the PSRAM-reserved pins that trip up projects moving up from a classic ESP32 or ESP32-CAM.
Arduino Uno Ek R4: The Made-in-India Board Explained
What the Made-in-India Uno Ek R4 actually is, whether the hardware matches the global R4, and why most Indian buyers should skip importing altogether.
ESP32-C6 Pinout Guide: GPIO, ADC, LP Core, and Matter-Ready Radios Explained
A complete ESP32-C6 pinout reference — verified strapping pins, GPIO, ADC, PWM, and the low-power RISC-V core, plus the WiFi 6, BLE 5.3, and Thread/Zigbee radios that set this chip apart from the rest of the ESP32 family.
Blynk 2.0 Complete Guide for ESP32 and ESP8266
Build IoT projects with the current Blynk platform: understand templates, devices, datastreams and virtual pins, connect ESP32 and ESP8266 boards, design dashboards and events, and choose the right architecture for sensors and remote control.
ESP32 Static IP Address: Complete Setup Guide (Code + Router)
Give your ESP32 a fixed IP address two ways: a DHCP reservation on your router (recommended) or WiFi.config() in code. Includes gateway, subnet and DNS settings, mDNS names, a working web server test and fixes for the most common failures.