BathButler is an open-source smart bath filling system that automatically controls hot and cold water valves to fill your bath to the perfect temperature and depth. It features a two-board architecture: an ESP32-S3 relay controller (Waveshare) handles valve control, temperature sensing, and safety logic, while the CrowPanel 1.28" Rotary Display provides an intuitive physical interface — just twist the knob to set your temperature, click to start. The system includes a real-time circular web dashboard accessible from any phone, Amazon Alexa voice control, over-the-air firmware updates, automatic WiFi setup with captive portal, and a flow rate calibration system for depth estimation without a level sensor. Safety features include overheat cutoff, watchdog timer, and valve protection. All interfaces share a common REST API + WebSocket backbone, with a Flutter mobile app in development.

The ultimate robotic 'Swiss Army knife' for Raspberry Pi Zero 2 W. Meet a powerhouse 32-channel servo controller featuring an ultra-robust 3x 5A power delivery system, built-in 6-axis IMU, and RTC. Say goodbye to brownouts and cable clutter, and easily drive power-hungry hexapods, quadrupeds, or animatronics from a single, compact board.

Project #15: Environment - SD Card Module - Mk37

This is a complete PCB project for stabilizing positive voltage, which includes a professional design of a printed circuit board (PCB) with all the files necessary for manufacturing and assembly. The circuit is designed to provide stable and reliable voltage to electronic components, while protecting the system from voltage fluctuations. Suitable for use in DIY projects, power systems, and studying electronics.

We are refining KeyMod and currently testing four connector prototype directions. They all work, but daily usability feels different. This round focuses on plug-in comfort, device clearance, portability, and real-world workflow convenience. You can also check the KeyMod pre-launch page and help us vote on the connector direction.

The AD9850-based VFO provides a clean, sine-wave alternative to square-wave oscillators

he project is an electronic circuit for regulating negative voltage (Negative Voltage Regulators). This is a complete PCB project for stabilizing negative voltage, which includes a professional design of a printed circuit board (PCB) with all the files necessary for manufacturing and assembly. The circuit is designed to provide a stable and reliable negative voltage to electronic components, while protecting the system from voltage fluctuations. Suitable for use in analog systems, symmetrical power supplies, DIY projects and studying electronics.

Positive LDO based on TPS7A4701 low noise - 4 μVrms drop in replacement for old LM78xx series.

Project #12: Robotics - Joystick - Mk35

I built an RGB thermometer with its own web interface that can control home appliances based on temperature changes

Negative LDO based on TPS7A3301 low noise - 16 μVRMS drop in replacement for old LM79xx series.

By following these steps, you can create professional-looking, durable housings that give your DIY electronics a polished and functional finish.

Project #15: Environment - Buzzer - Mk36

Control panel for Home Assistant with voice assistant

Using the LVGL library and SquareLine Studio, I created a visualization that is not only functional, but also aesthetically enriches any audio system.