Guides

Pinouts. Tutorials. Answers.

Chip and board pinouts, plus sensor and module reference guides: real GPIO tables, real specifications, and working code for each one.

Reference MH-RD Raindrop Detection Module A low-cost rain sensor built from two boards: a copper-trace sensor plate and an LM393 comparator breakout. Covers the pinout, how the analog/digital outputs behave when the plate gets wet, and wiring it to an ESP32 or Arduino. Read guide

duck Building a micro-Duck, Part 4: Too Many Ducks Not a build step. I compare the XGO-Duck with the original Pollen Microduck and four other builds, check what each one really shows, and work out what a MicroDuck costs before I spend anything. Read guide

Reference MPU6050 Accelerometer + Gyroscope Complete Guide The MPU6050 packs a 3-axis accelerometer and 3-axis gyroscope on one die with an onboard motion-fusion processor, for around the price of a single sensor. This guide covers its real I2C addressing, pinout, and wiring one to an ESP32. Read guide

Reference ESP32-CAM (AI-Thinker) Pinout The real pin reference for the AI-Thinker ESP32-CAM: an ESP32 with a camera connector and microSD slot, and only 2 or 3 genuinely free GPIOs left over. Read guide

Reference SMD Reference Sheets: Printable Package Sizes and Capacitor Codes Three printable reference sheets for SMD work: package sizes at real-life scale, PCB track widths and hole sizes, and how to read the codes printed on capacitors. Read guide

Reference The Complete Guide to the HLK-LD2450 24GHz Multi-Target Tracking Radar Module The LD2450 is Hi-Link's multi-target mmWave radar: where the already-published LD2410 only tells you someone is present, the LD2450 tracks up to three people at once with real X/Y position and speed. This guide covers its real UART protocol, wiring, and when you actually need position tracking over simple presence. Read guide

Reference NeoPixels (WS2812B) – Complete Guide Individually addressable RGB LEDs that need just one data pin to control hundreds of LEDs, each with its own 24-bit color. This guide covers the WS2812B family, wiring to an ESP32-C6 SUPER MINI, power budgeting, and ESP-IDF/Arduino example code. Read guide