Diansai source code three-phase electronic multi-function energy meter

It is mainly composed of the basic functions and structure of the professional electric energy measurement chip ATT7022B and the single-chip computer MSP430F149 system. In terms of hardware circuits, the electromagnetic compatibility of the circuit is fully considered in the circuit design. A more reliable power supply for electric energy meters is designed to improve the ability to withstand lightning strikes. And it is proposed to use EPROM to store data in order to achieve the purpose of simplicity and security. In the particularly critical communication unit of the electronic energy meter, multiple communication methods such as serial communication and wireless communication are designed to connect scattered electricity meters into a network to achieve centralized control and remote meter reading functions. In addition, a GPS module is designed to locate the coordinates of the collection point.

Schematic PCB

IndyMill: Open source DIY metal CNC machine tool

IndyMill is an open source DIY CNC machine

Schematic PCB

Agilent E3631A DC power supply schematic diagram

Several 51 chips were also used in the design.

Schematic PCB

Open source industrial control baseboard made by Arduino for STM32H7

The schematic diagram is open source, you can see if there is anything worth learning from. This baseboard is designed for their previously launched H7 core board.

Schematic PCB

Smart car schematic diagram + PCB diagram (formerly the second prize in the national award)

Smart car schematic diagram + PCB diagram (formerly the second prize in the national award)

Schematic PCB

FreeEEG32: Affordable, stackable, open source, 32-channel EEG

FreeEEG32 is a stackable, open source, 32-channel, 24-bit, sigma-delta, simultaneous sampling board designed to meet the needs of scientists and brain hackers who require high-quality, affordable research-grade equipment. We have been developing this EEG for many years as we worked to create the ultimate open source solution to expensive proprietary EEG technology. FreeEEG32 combines four 8-channel AD7771 ADCs with ultra-low noise (<0.22 μV measured) sources and references, all driven by the powerful STM32H7 ARM Cortex-M7, while handling pre-processing. It's sensitive enough to handle high-quality EEG data collection and more.

Schematic PCB

51 microcontroller ultrasonic ranging program

The ultrasonic ranging system based on a single-chip microcomputer measures the output pulse width, that is, the time interval between transmitting and receiving ultrasonic waves. It controls the peripheral circuits in a timely manner through the single-chip microcomputer and provides signals such as frequency oscillation, data processing, and decoding display to the peripheral circuits. The ultrasonic transmitting circuit includes a gate control circuit (RS flip-flop) and a differential/shaping circuit, while the receiving circuit consists of receiving, amplifying, signal filtering, and shaping circuits.

Schematic PCB

2021 Electronic Competition F Question Unmanned Drug Delivery Vehicle Question Vision + Electronic Control Code + Design Report (National First)

Schematic PCB

2018 Electronic Competition Question A-Current Signal Detection Device (Tianjin)

Schematic PCB

Open source desktop two-wheeled legged robot

The circuit board in the project is drawn using Jiali Chuang EDA, and the code uses Arduino IDE, which is very suitable for beginners who are interested in robots.

The software, hardware, and mechanical structure are all open source.

Schematic PCB

Design of smoke SMS alarm based on STM32 (program, PCB, schematic diagram)

Detect whether there is smoke and flammable gas in the environment. If the above gases are present, send an alarm text message to the mobile phone.

Schematic PCB

Protues simulation example (8051)-stepper motor C version.rar

Protues simulation example (8051)-stepper motor C version

Schematic PCB

Digital oscilloscope design based on STM32 (schematic diagram, source program, etc.)

Digital oscilloscope design based on STM32, including schematic diagram and source program, etc.

Schematic PCB

Open source handheld vector network analyzer NanoVNA

NanoVNA is a small handheld vector network analyzer with LCD display and battery-powered portable device. This project aims to provide a useful RF gadget.
The measurement frequency range is 50KHz - 300MHz, and there are many derivatives based on this design on the Internet.

Schematic PCB

GPDI: SYZYGY interface board with 2 digital video ports

SYZYGY is an FPGA extension standard for medium to high speed interfaces. This project is a splitter that outputs video to a regular digital display and also supports input from a digital display.

Schematic PCB

Resonance: Resonance plug-in board for card10 to add video output

The board of this design is intended to sit between the fundamental and harmonic boards and monitor the SPI data running to the display. Onboard ECP5 will mirror the display and output a copy to a digital monitor.​

Schematic PCB

syzygy-rgb888-lcd: 5 paired with Sipeed Tang Nano

​Connect to a 5" LCD paired with a Sipeed Tang Nano. This is an 800x480 LCD with RGB888 connections. All 8 bits of each channel are connected via SYZYGY connectors.

Schematic PCB

Foreign powerful, simple and portable oscilloscope design (schematic diagram, PCB, program source code, etc.)

Foreign powerful, simple and portable oscilloscope design (schematic diagram, PCB, program source code, etc.)

Schematic PCB

A complete access control system (schematic diagram + source program)

A complete access control system (schematic diagram + source program)

Schematic PCB

syzygy-sgmii: Breakout board for SGMII Gigabit Ethernet PHY DP83867C

This design is a breakout board for SGMII Gigabit Ethernet PHY DP83867C. It connects to SERDES via a SYZYGY-TXR connector to test and evaluate Ethernet over 1.25Gbps serial channels. 2 channels are used and CDR is required on the RX path. Compared to RGMII, SGMII significantly reduces the number of signals required for routing.

Schematic PCB