Proceedings of the Electronic Design Competition

The collection of papers from previous electronic design competitions includes design ideas, circuit diagrams and corresponding program flow charts for function signal generators, oscilloscopes, automatically controlled balancing cars, radios, etc.

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)

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Based on DA14580_ADXL362 schematic diagram (Xiaomi bracelet solution)

Based on DA14580_ADXL362 schematic diagram (Xiaomi bracelet solution)!

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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.

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FRDM-KW38: Freedom development board for KW39/38/37 MCU

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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~

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KITFS84SKTEVM: FS84 QFN48EP Safety SBC programming board

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STM32 Nucleo-64 development board for STM32G474RE MCU, supports Arduino and ST morpho connections

STM32 Nucleo-64 development board using STM32G474RE MCU, supporting Arduino and ST morpho connections

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STM32 Nucleo package for IO-Link devices fully compatible with IO-Link v1.1 (PHY and stack)

STM32 Nucleo kit of IO-Link devices, fully compatible with IO-Link v1.1 (physical layer and stack)

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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.

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Super cool face-changing mask DIY

The product design is open source and very cool and beautiful.

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Amethyst - a retro home computer built with only 6 chips

Amethyst is a classic home computer developed by Matt Sarnoff. It has an integrated keyboard, can generate sounds and images, uses the Forth programming language, has image and voice commands, a debugger and screen editing functions.

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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

Ultra-low standby power less than 90mW auxiliary AC/DC power supply reference design

The PMP21251 reference design uses the UCC28056 CRM/DCM PFC controller, UCC256304 enhanced LLC controller and integrated driver to provide a 12V/10.8A output (continuous current, 14.4A peak current) from a universal AC input. This design achieves peak efficiency of 92.4% at 115VAC input and 94.0% at 230VAC input. Efficiency and power factor also meet 115V and 230V internal 80 PLUS Gold specifications and DoE Level VI requirements. Additionally, without turning off the PFC, the design can achieve power consumption as low as 89mW at an input supply voltage of 230VAC. 

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CN0245

Wideband LO PLL frequency synthesizer with simple interface to quadrature demodulator

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iphone6-5.5+ schematic.zip

Apple's full series of drawings: iphone6-5.5+ schematics.

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Discovery Kit for STM32H747XI MCU

Discovery Kit, featuring STM32H747XI MCU

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Modular, open-source test & measurement chassis

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

RX5808 receiver ESP32 version

The hardware design adopts upper and lower layer design. The upper layer is the control circuit and the lower layer is the dual receiving circuit. The interface design is based on LVGL.

Schematic PCB

jtag-programmer: JTAG programmer based on FT232H

​Gregory Davill is a technical expert from Australia who is very famous and active in the field of open source hardware. In December 2020, he insisted on designing a circuit board every day, using KiCad to complete the circuit design and PCB layout and routing. This is the adventure-calendar-of-circuits-2020 project. This design is a JTAG programmer based on FT232H.

Schematic PCB