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

Open source wearable watch (including firmware, schematics and 3D printing diagrams)

This smartwatch can measure linear acceleration, rotational speed, heart rate and SpO2 (oxygen saturation) of the hand

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

syzygy-flir-tau2: Tau2 LWIR core plug-in for SYZYGY FLIR

This design is a plug-in from FLIR's Tau2 LWIR core. Both the LVDS and CMOS channels are connected to the UART configuration channel through the SYZYGY connector.

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

3D rotating bare metal porting based on H7 (800x480)

Ported the 3D rotation + meteor shower background demo to H7, and the pure rendering is very smooth.

Schematic PCB

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

Protues simulation example (8051)-stepper motor C version

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

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

MiniQ: a mini quadcopter

MiniQ is a mini quadcopter that is open source from hardware design to control algorithm. The algorithm used for the Altitude Heading Reference System (AHRS) is the DCM complementary filter. The system calculates the height and controls the output PWM of the four motors 1600 times per second. It can be controlled remotely via Bluetooth (Bluetooth Serial Port Profile).

Schematic PCB

Tesla Roadster open source design data (battery monitoring board, vehicle display system, HVAC controller, diagnostic software)

Schematic PCB

Based on STM32L496 smart water cup holder

This work designs a smart water cup holder that can detect the use status of the water cup and remind users to drink water in time. By connecting to the Alibaba Cloud platform, automatic clock calibration is achieved. You can also set parameters for the water cup holder on the cloud terminal. The main work of this project is to design a beautiful interface that is pleasing to the eye. The other is to connect to Alibaba Cloud to realize cloud sharing and intelligent connection.

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

ESP_8_BIT: ESP32 takes you to experience the nostalgic game console

Using only one ESP32 chip, you can enjoy the nostalgic gaming experience brought by Atari 8-bit, NES and SMS game consoles on your TV.

Schematic PCB

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

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

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

Nuvoton NUC501 MCU micro thermal printer solution circuit diagram and source code

The composition and working principle of the micro thermal printer based on NUC501MCU are analyzed in detail, and the design and implementation of thermal head overheat protection and stepper motor drive module are given.

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

2018 Electronic Competition Question A-Current Signal Detection Device (Dalian University of Technology)

Schematic PCB