SolderHub Editorial
Articles &
Guides
In-depth tutorials, component deep-dives, and hardware engineering insights — written for builders.
Page 10
Blynk Scheduling and Automations for ESP32 Projects
Plan schedules and automations for Blynk-connected ESP32 projects. Separate cloud automation from local time-based logic, handle timezone and connectivity failures, and define safe behavior for relays and pumps.
How to Install Node-RED on Windows: Node.js, First Launch & Troubleshooting
Install Node-RED on Windows using Node.js and npm, launch the editor at localhost:1880, verify your first flow, and fix common PowerShell and startup issues.
Wemos D1 Mini Pinout: Every Pin Explained (GPIO Mapping, Boot Pins, Power)
D1 is GPIO5, not GPIO1 — the full Wemos D1 Mini pin mapping, the D3/D4/D8 boot-mode gotchas, and the voltage rules that actually matter.
TB6612FNG vs L298N Motor Driver: Which One Should You Use?
The L298N drops about 2.5 V at 1 A and runs hot. The TB6612FNG drops about 0.5 V. A datasheet-based comparison of voltage drop, heat, current ratings, 3.3 V logic, wiring and code for Arduino and ESP32, with a clear verdict.
STM32 Nucleo Pinout: Arduino Headers, Morpho Connectors, and GPIO Explained
Complete STM32 Nucleo pinout reference: Arduino-compatible headers vs ST Morpho connectors, the built-in ST-LINK debugger, ADC voltage limits, and every peripheral pin mapped.
Control an ESP32 LED with Node-RED and MQTT
Build a real ESP32 LED controller with Node-RED and MQTT. Wire the LED, configure Mosquitto, upload Arduino code, send ON/OFF commands, verify status feedback and troubleshoot safely.
MPU-6050 vs MPU-6500 vs MPU-9250 vs ICM-20948: Which IMU Should You Buy?
The real differences between the MPU-6050, MPU-6500, MPU-9250 and ICM-20948, how to check which chip is actually on your board, which ones TDK has discontinued, and which IMU to buy for your project.
ESP32 Deep Sleep Guide: Extend Battery Life from Days to Months
ESP32 draws 240mA at full power — enough to drain an 18650 battery in 18 hours. With deep sleep, that same battery lasts 4 months. This guide covers all five wakeup sources, RTC memory, and real code you can drop into your next project.
I2C vs SPI: What's the Difference and When to Use Each
I2C uses 2 wires. SPI uses 4. But the real differences go deeper than that. Here's a practical guide to choosing the right protocol for your Arduino or ESP32 project.
ESP32 vs Arduino: Which Should You Choose in 2026?
ESP32 and Arduino both have their place in electronics. Here's an honest comparison — specs, cost, use cases, and which board wins for your next project.
NodeMCU ESP8266 complete Pinout Guide: GPIO Numbers, D-Pins & Boot Pins Explained
Never confuse D1 with GPIO5 again — plus the D3/D4/D8 boot-mode pins that quietly stop your board from starting.
Arduino Uno R3 Pinout: Every Pin Explained (Digital, Analog, PWM, Power)
Complete Arduino Uno R3 pinout reference: all 14 digital pins, 6 analog inputs, PWM, UART, SPI, I2C, AREF, and power rails explained with wiring tips and common mistakes.