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.

Guide ESP32-WROOM-32D Pinout The complete pin reference for the ESP-WROOM-32D module: 34 programmable GPIOs, ADC/DAC, touch, RTC and the exact pins you can safely reuse. Read guide

Reference NFC NTAG215 Stickers: What They Are and How to Program Them What an NFC NTAG215 sticker is, how a tag with no battery can talk to your phone, and what it is used for. Plus how to program one with a free phone app or an ESP32 and PN532, and how to lock it. Read guide

Reference Guide to the HWFS-1 Anemometer A passive, cup-style wind speed sensor with a built-in voltage generator, no external power needed. This guide covers the analog output, wiring to an ESP32 ADC pin, and the calibration formula to convert voltage into km/h or m/s. Read guide

Guide Arduino Nano Pinout The complete pin reference for the classic ATmega328P-based Arduino Nano: 14 digital pins, 8 analog inputs, and the exact pins you can safely reuse. Read guide

Reference The Complete Guide to the HLK-LD2410 24GHz Human Presence Radar Module A 24 GHz FMCW radar that detects stationary presence, breathing and micro-motion, not just movement, which is exactly where a standard PIR sensor fails. This guide covers the UART/OUT-pin pinout, ESP32 wiring, configurable distance gates, and ESPHome integration. Read guide

Reference DS18B20 1-Wire Temperature Sensor A rugged, waterproof-capable temperature sensor that can put dozens of measurement points on a single ESP32 GPIO. Covers how the 1-Wire bus and 64-bit ROM addressing work, the mandatory pull-up resistor, and parasite power mode. Read guide

Reference The Complete Guide to the HC-SR501 PIR Motion Sensor One of the cheapest ways to add motion detection to a project: a passive infrared sensor with adjustable delay and sensitivity, a simple digital HIGH/LOW output, and both retriggerable and non-retriggerable modes. Read guide