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
Start Here: Your First ESP32 HomeKit Accessory
A step-by-step path through this site, from choosing HomeKit or Matter to a working ESP32 accessory you can update over the air.
Read guide
Reference
Seeed Studio XIAO ESP32C3 Pinout
The real pin reference for Seeed Studio's XIAO ESP32C3: a thumbnail-sized RISC-V Wi-Fi/BLE board with a U.FL antenna connector and no onboard LED.
Read guide
Reference
2.25 inch TFT LCD ST7789 SPI Display
A compact 128 x 400 IPS display driven by the ST7789 controller over a 4-wire SPI bus. This guide covers the pinout, ESP32 wiring, and Arduino code using the Adafruit ST7789 library.
Read guide
Reference
NodeMCU-ESP32-C2 Pinout
The complete pin reference for the NodeMCU-ESP32-C2: an ESP8684-WROOM-02 board with a USB-C port and CH340C, 13 usable GPIOs, Wi-Fi and Bluetooth LE.
Read guide
Reference
HX711 + Load Cell Weight Sensor Complete Guide
The HX711 is a 24-bit ADC purpose-built to amplify the tiny signal from a 4-wire load cell into something a microcontroller can read reliably. This guide covers the real wiring convention, which varies by manufacturer, and the calibration process every load cell genuinely needs, regardless of which specific one you bought.
Read guide
Guide
ESP32-C5 Pinout
The complete pin reference for the ESP32-C5: the first RISC-V Espressif chip with dual-band Wi-Fi 6, plus the exact pins you can safely reuse.
Read guide
Reference
LILYGO T-Display-S3 Pinout
The real pin reference for LILYGO's T-Display-S3: an ESP32-S3 board with a built-in 1.9-inch color LCD, two buttons, and battery-monitoring support.
Read guide
Reference
Seeed Studio XIAO ESP32C3 Pinout
The real pin reference for Seeed Studio's XIAO ESP32C3: a thumbnail-sized RISC-V Wi-Fi/BLE board with a U.FL antenna connector and no onboard LED.
Read guide
Reference
2.25 inch TFT LCD ST7789 SPI Display
A compact 128 x 400 IPS display driven by the ST7789 controller over a 4-wire SPI bus. This guide covers the pinout, ESP32 wiring, and Arduino code using the Adafruit ST7789 library.
Read guide
Reference
NodeMCU-ESP32-C2 Pinout
The complete pin reference for the NodeMCU-ESP32-C2: an ESP8684-WROOM-02 board with a USB-C port and CH340C, 13 usable GPIOs, Wi-Fi and Bluetooth LE.
Read guide
Reference
HX711 + Load Cell Weight Sensor Complete Guide
The HX711 is a 24-bit ADC purpose-built to amplify the tiny signal from a 4-wire load cell into something a microcontroller can read reliably. This guide covers the real wiring convention, which varies by manufacturer, and the calibration process every load cell genuinely needs, regardless of which specific one you bought.
Read guide
Guide
ESP32-C5 Pinout
The complete pin reference for the ESP32-C5: the first RISC-V Espressif chip with dual-band Wi-Fi 6, plus the exact pins you can safely reuse.
Read guide
Reference
LILYGO T-Display-S3 Pinout
The real pin reference for LILYGO's T-Display-S3: an ESP32-S3 board with a built-in 1.9-inch color LCD, two buttons, and battery-monitoring support.
Read guide