Arduino dual combination: based on iMX8 and STM32H747 development boards

Portenta X8 is a powerful industrial-grade SOM with a pre-installed Linux operating system onboard and can run device-independent software thanks to its modular container architecture. Securely perform OS/application OTA updates with onboard Wi-Fi/Bluetooth® Low Energy connectivity. It is basically two industrial products combined into one, with a power of no less than 9 cores. Utilize the Arduino environment to perform real-time tasks, while Linux handles high-performance processing. Portenta X8 features NXP® i.MX 8M Mini Cortex®-A53 quad-core up to 1.8GHz per core + 1x Cortex®-M4 up to 400MHz, and STMicroelectronics STM32H747 dual-core Cortex®-M7 up to 480Mhz +M4 32-bit Arm® MCU, up to 240MHz.

Schematic PCB

Ultrasonic standing wave axial suspension moving device

With the in-depth research of ultrasonic levitation technology by domestic and foreign scholars, ultrasonic levitation devices have developed from expensive horns and other equipment to structures composed of general-purpose commercial ultrasonic transducers. Combined with 3D model printing technology, any scientific researcher and Electronics enthusiasts can use these components to make ultrasonic levitation devices to facilitate related acoustic research. This technology was published in AIP Publishing by Asier Marzo et al. Based on its model, this design changes the main control MCU, uses the timer inside the MCU to generate accurate PWM waves, and improves the software so that the ultrasonic device can move the suspension stably during the axial suspension movement. Small objects in multiple nodes.

Schematic PCB

Open source scalar network analyzer design

The author opens up the schematic diagram and supporting Raspberry Pi code. The simulation bandwidth is already 30MHz, and the frequency response is very close to the theoretical simulation, with a difference of about 0.02dB between 1kHz and 30MHz.

Schematic PCB

HEGduino: Measure real-time cerebral blood oxygen levels (all open source)

Uses infrared light sensing to determine changes in blood oxygen levels in the brain in real time. Use the device in less than ten minutes to learn how to directly change blood flow to your brain. Neurons do not store energy, so regional brain activity is closely related to changes in blood oxygenation, where healthy blood flow patterns are essential for high function and growth of the brain.

Schematic PCB

HDMI to MIPI module, mobile phone screen into display (produced by Zhihuijun)

The quality of mobile phone screens is very high and the price is low. It is almost impossible to find mini displays made of mobile phone screens on the market, so this project is to solve this demand.

Schematic PCB

Open source 60W small UPS power supply reference design

Ideal for running network devices such as small switches, home routers, and WLAN access points.

Schematic PCB

A tiny FIDO2 security key for two-factor authentication and passwordless login

Somu is a small FIDO2 security key that you can use with your Google, Twitter, and GitHub accounts for two-factor authentication, or with your Microsoft account for passwordless login.

Schematic PCB

Flipper Zero: an open source geek multi-function tool based on STM32W55B

Flipper Zero is a portable multi-tool designed for developers and geeks with a toy-like body. It enjoys exploring digital content such as radio protocols, access control systems, hardware, and more. It's completely open source and customizable, so you can extend it in any way you like.

Schematic PCB

Make a USB-C power supply (understand the principles of USB-PD in depth, including schematics and English design instructions, etc.)

A simple power supply design based on USB-PD, USB-PD allows to provide voltage up to 20V (current up to 5A), the author shared his design details, you can have an in-depth understanding of the working principle of USB-PD.

Schematic PCB

Universal gear indicator for motorcycles

This is a new design for a universal gear indicator that can be installed on any motorcycle as an aftermarket accessory. Its main advantage is that its operation depends entirely on the movement of the gear lever, rather than being connected to speedometer and tachometer sensors (found in expensive commercial equipment), which are rarely found in older motorcycles. It consists of a main circuit including a 7-segment LED indicator, two Hall sensors attached to the motorcycle frame, and a small magnet placed on the gear lever.

Schematic PCB

MCU-based face recognition solution

The MCU-based solution for Face Recognition is a turnkey hardware and single source software solution for adding machine vision to products using the i.MX RT line of crossover processors.

Schematic PCB

SwarmDrive: Development board for motor experiments based on ESP32

SwarmDrive based on ESP32 has rich teaching documents, professionals and students can use it to easily learn various commutation algorithms and related knowledge of BLDC motors.

Schematic PCB

Starfish: an open source project for motor control board using component pick-and-place of RP2040 and TMC2209

Starfish is a pick and place machine control board built on the Raspberry Pi RP2040 microcontroller and Trinamic TMC2209 motor driver. This control board has some similarities to a 3D printer control board, but it has some unique issues to solve—including controlling solenoids and communicating with vacuum sensors. All board information is open source, and detailed explanations are provided to help you copy successfully.

Schematic PCB

FSLBOT: NXP Mechatronics Robot

The NXP Mechatronics Robot is an easy-to-use mechatronics development and demonstration platform for operating with the TWR-MECH Board.

Schematic PCB

Magically modify your computer power supply to make a beautiful desktop power supply, simple and practical

You can certainly buy desktop power supplies, but they're not cheap. As the current capacity and output voltage quantity increase, so does the price. While a commercial desktop power supply is certainly worth the investment, you may want to consider a cheaper solution. Adapt an old computer power supply for use on your workbench. Computer power supplies have all the voltages you need and some very impressive current capabilities.

Schematic PCB

Smarthome-dashbutton: smart home control button

This is what smart home enthusiasts want to control their entire lights, thermostat, or any other smart device from their couch without having to activate a wall switch.

Schematic PCB

Open source development tool USB-Cereal

USB-Cereal is a powerful, fully open source development tool that simplifies testing, development, debugging and manufacturing of devices using USB-C. Using the extended capabilities of USB-C, this unique hardware saves time and effort by simplifying debugging and factory log capture, as well as firmware update procedures.

Schematic PCB

Pixblasters Video LED Controller: Combine with LED strips to create a huge display that acts as a regular video monitor (PCB, schematic, demo source code)

Huge, shiny, beautiful video displays with thousands of LEDs have always been out of reach of enthusiasts and small business owners due to their high cost and complexity. Pixblasters MS1 changes all that.

Schematic PCB

Hotplate Soldering Iron: Repurpose an old electric iron into a heated soldering station

The basic concept of this work is slightly different from standard tools such as a reflow oven or soldering iron. Heat is provided from the bottom of the PCB.

Schematic PCB

Fully open source nV level measuring instrument (super awesome, including PCB, schematic diagram, firmware, etc.)

This awesome project comes from the nV-level measurement instrument challenge launched by xDevs. The project requirements are relatively difficult and only one author has completed it. The author has open sourced all project materials and provided detailed explanations (in English).

Schematic PCB