Project #28 – Sensors – Grayscale Sensor – Mk20

I built a cheap turntable and obviously I failed. ????

Lightweight ESP32-based IoT module for remote data logging enabling the collection and upload of 3D printing statistic values to a cloud server, as well as displaying them locally on a dedicated display. The project also involves extending the Marlin project by adding a custom G-code command at the firmware level.

A new steering system I designed mainly for Go-Karts.

The OBP40 is an open, cost-effective marine multifunction display, ideal for DIY boat projects and sensor visualization. It's based on the CrowPanel 4.2 with an e-paper display and an ESP32-S3, 8 MB Flash, and 8 MB PSRAM. The system displays numeric and graphical pages with user-selectable values ​​and trends and is operated via buttons. Power is supplied via 5V USB-C. A LiPo battery pack with deep discharge protection and a magnetic dock enables mobile operation. Data communication includes NMEA2000, NMEA0183, 2.4 GHz Wi-Fi, and I2C/1Wire via an expansion port – perfect for integration with onboard electronics and sensors. The open-source firmware is customizable and can be deployed via Wi-Fi or USB. Comprehensive documentation, Telegram support, and wiring diagrams facilitate replication. This makes the OBP40 a flexible, expandable display module for boat data visualization and DIY marine electronics.

A set of 8 pistons with a timing belt and spark plugs.

In this project, I built a simple yet effective variable high voltage power supply using affordable components, offering precise control for high-voltage experiments.

Meet the Manual Universal Testing Machine — a compact powerhouse built for pure mechanical precision. Powered by a smooth hand-crank and guided by dual precision screws, it delivers rock-solid tension and compression testing without electronics, noise, or complications. Engineered with a premium metallic finish and modular fixtures, it turns classroom experiments and lab tests into a hands-on, intuitive experience. Simple. Accurate. Beautifully built. This is material testing—redefined

The DIY Heating Booster helps you get more out of your existing radiator – without modifying your heating system. An ESP32 controls 12V fans mounted underneath the radiator, automatically turning them on when the radiator gets warm to efficiently distribute heat throughout the room. The control logic works standalone with a local temperature sensor, but can also be fully integrated into Home Assistant. Perfect for cold spots, smart upgrades, and energy-saving DIY solutions.

A modern, working cereal dispenser concept.

This is a modern, working design of a cereal dispenser.

Project #28 – Sensors – Accelerometer – Mk19

PCB Reverse enginnering : 2 layers , pcb2

Redefining classic steam design with modern precision — the Twin Cylinder Paddle Steamer Engine is a tribute to engineering artistry in SOLIDWORKS.

A fully engineered obstacle-avoidance robotic car featuring a complete SolidWorks design, 6-sensor perception, and Arduino-based control—built as a foundation for future autonomous navigation modes.