BoatOpenIO v2: Modular Marine Gateway Main Board

32 builds

How an ESP32-S3 Renders N64-Style Megatextures

A custom software renderer lets an ESP32-S3 move through a textured 3D scene without a dedicated GPU. The project fits its megatexture data into 16 MB of PSRAM by using 8-bit indexed color, showing how mipmaps, compression, and careful memory choices support console-style graphics on small hardware.

Read the build on hackaday.com: How an ESP32-S3 Renders N64-Style Megatextures

An Offline Arduino Agent That Understands Plain English

Type a plain-English instruction into an Arduino App Lab project, and a local language model on the UNO Q can direct connected hardware. This hands-on build combines Modulino sensors and outputs, showing how behavior can change through new sentences rather than firmware changes, without internet access or API keys.

Read the build on projecthub.arduino.cc: An Offline Arduino Agent That Understands Plain English

Arduino Two-Axis Level With Zero Reference

A bubble level can check one surface, but this handheld Arduino tool can compare two. An ADXL345 feeds gravity readings to a Nano, which shows pitch and roll on an OLED. Press ZERO on one bracket, then match that stored angle on another—even when both are intentionally sloped.

Read the build on learniot.in: Arduino Two-Axis Level With Zero Reference

Add 16 I/O Pins with a PCF8575

A small PCF8575 module gives Arduino, ESP8266, or ESP32 projects 16 extra digital lines through just SDA and SCL. This hands-on setup uses LEDs and buttons to test the connection, while a library handles the I2C details and leaves the host board’s built-in pins available.

Read the build on mischianti.org: Add 16 I/O Pins with a PCF8575

Build an Arduino/ESP32 OBD2 K-Line Tool

Older cars often speak K-Line instead of CAN. This Arduino/ESP32 library offers a practical starting point for connecting to those ECUs, provided you add a proper protected transceiver. The repository’s examples and source should confirm supported protocols, timing, wiring, and diagnostic commands before any vehicle connection.

Read the build on github.com: Build an Arduino/ESP32 OBD2 K-Line Tool

Build a Wi-Fi Four-Fan Controller

Four fans, one Wi‑Fi-connected board, and open files make this more than an Arduino sketch. The repository covers firmware, electronics documentation, and a printable case, while the microcontroller turns network commands into separate PWM outputs. Check fan ratings and match every file to its hardware revision before building.

Read the build on github.com: Build a Wi-Fi Four-Fan Controller

All 32 builds in Arduino