High resolution magnetic rotary encoder based on RP2040

This is a mature development board combined with a magnetic rotary encoder, which uses a Raspberry Pi RP2040 microcontroller with a base resolution of 36, expandable to 36,000 steps per revolution.

Schematic PCB

Unicycle self-balancing robot produced by Zhihuijun

This little robot is called ONE, which is actually a work UP made when he was in school five years ago. After finishing it that year, I never had time to sort out the materials. During this period, many classmates came to ask me questions related to this project. This time, I simply uploaded the materials to Github and made them open source. Open source information includes the source code of the STM32 main control and the 3D model files of the mechanical structure. The circuit source files can no longer be found due to their age. Students with basic knowledge can study it by themselves~

Schematic PCB

42 stepper motor closed loop solution

Main control chip: Hangshun HK32F030C8T6 Driver chip: two Toshiba TB67H450 (maximum current 3.5A) Encoder chip: Magone ultra-high-speed zero-delay AMR encoder MT6816 High-speed optocoupler: Toshiba dual-channel TLP2168 Working voltage: 12-30V (24V recommended) Operating current: Rated 2A (42 steps) 2.5A (57 steps) Maximum 3.5A Control accuracy: less than 0.08 degrees Electronic gear: 4, 8, 16, 32 (can be set arbitrarily)

Schematic PCB

Implementing ultra-low-cost dual fiber optic network card 100BASE-FX based on Raspberry Pi microcontroller (open source software and hardware)

The Raspberry Pi microcontroller itself does not have an Ethernet MAC, but it can be easily implemented through the programmable IO of the Raspberry Pi. The programmable PIO of the Raspberry Pi microcontroller that costs 5 yuan a piece is indeed a miracle, with IO below 250MHz. Control everything.

Schematic PCB

2018 Electronic Competition Question E-Energy Recovery Device (Xidian University)

Schematic PCB

Open source servo driver based on STM32F4

STMBL is an open source servo driver designed for CNC machine tools and robot modifications. It supports industrial AC and DC servos up to 320V and 2kW.

Schematic PCB

Image recognition intelligent tracking car source code based on TMS320F2812

The system is an intelligent tracking device based on TMS320F2812, which has the function of intelligently locking targets and automatically tracking locked targets. CPLD is used to obtain image information collected by the camera, and TMS320F2812 is used to process the image information. Median filtering, corrosion and other algorithms are used to extract target information, and then the target coordinates are calculated. The car movement is controlled through the internal PWM module of the DSP, and the target coordinates are wirelessly sent to the handheld device. Remote control device to achieve real-time tracking of targets.

Schematic PCB

EEZ Bench Box 3: Modular, open source test and measurement chassis that’s more than just a programmable DC power supply

The EEZ Bench Box 3 (BB3) represents a new class of modular test and measurement (T&M) equipment. It provides a complete open source hardware and software framework that bridges the gap between DIY hobbyist tools and professional desktop equipment and combines their best features. Inspired by the EEZ H24005 power supply, BB3 has attracted many enthusiasts with its extensive feature set, rich user interface, DIY friendliness and completely open source design. BB3 will initially feature modules that provide the same functionality as the H24005, but these modules will plug into a single device, providing improved modularity, greater capacity, more processing power, an easier-to-use interface and enhanced flexibility, all These are available in compact form factors.

Schematic PCB

Variable speed constant frequency wind power generation system operation and control research source code based on TMS320F2812

The AC excitation variable speed constant frequency wind power generation experimental system was developed using TI's TMS320F2812 to complete the maximum wind energy tracking control experiment.

Schematic PCB

Distributed temperature and humidity acquisition system based on STM32H745I

Schematic PCB

DC motor drive (solution design + chip information + schematic diagram)

DC motor drive (solution design + chip information + schematic diagram)

Schematic PCB

Fluke early model 8020A multimeter schematic diagram

The very early model was a bit crude.

Schematic PCB

esp32s2-lepton: ESP32s2 thermal imager

​ESP32s2 Thermal Imager=ESP32s2 + Lepton 3.5 + Battery charger + 240x240 pixel LCD

Schematic PCB

ecpbreaker: Based on icebreaker FPGA board, upgraded ECP5

The icebreaker project is a very nice and handy little board. But it has a small flaw, the ice40 FPGA it uses is very simple, and it's generally fun to see people doing exciting projects with 5k LUTs. Sometimes it's convenient to have some extra space available when experimenting.

Schematic PCB

USB2.0 full-speed analyzer based on Raspberry Pi RP2040

This is a simple USB sniffer based on the Raspberry Pi RP2040. It supports low speed and full speed modes. The firmware presents itself as a virtual COM port (VCP), so no additional software is required and it is compatible with all operating systems.

Schematic PCB

SimplePnP: an open source PCB placement machine for personal use (including design files, schematics, source code, software, etc.)

SimplePnP is designed to be reliable, accurate, affordable, and adaptable to a wide range of components. It's a great choice for electronics startups, inventors, researchers, and hacker spaces.

Schematic PCB

Full open source: Microchip’s complete solution for wearable ECG devices

All information is fully open, and there is also a mobile APP, and the algorithm is also made public.

Schematic PCB

Open source power supply EEZ BB3: based on stm32 H7 main control board, voltage supports 0-80V, current 0-10A

Schematic PCB

ESP32s2 CO2 Monitor

ESP32s2 CO2 Monitor=ESP32s2 + Sharp memory LCD + CO2 Monitor

Schematic PCB

Data transparent transmission based on MM32W wireless MCU series

Introducing a Bluetooth case - a data transparent transmission application developed based on the MM32W series.