110/220VAC optically isolated zero-crossing detector module for DIN rail bracket mounting with 3.3V or 5V output - ideal for Arduino, ESP32/ESP8266

Detects Zero Cross point of AC supply (110/220VAC) and outputs a 1ms square pulse at 3.3V or 5V. 72mm x 20mm for DIN rail carrier mount.

Schematic PCB

ROBOCUP small group soccer robot

ROBOCUP is a small football robot with source code and documentation. If you are interested, you can take a look.

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CPLD portable digital storage oscilloscope hardware platform design

CPLD portable digital storage oscilloscope hardware platform design

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2018 Electronic Competition Question B-Fire Fighting Aircraft (Dalian University of Technology)

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(Contest entry) STM32F072RB NUCLEO smart home control

(Contest entry) STM32F072RB NUCLEO smart home control.

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Low-cost 2.5KV USB power isolation solution (schematic + BOM + gerber, etc.)

This is a low-cost isolation achieved through a power transformer. Since the transformer is more convenient for AC isolation, but DC is not suitable, ATtiny412 is specially used for control.

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Quadcopter main control board design schematic diagram and PCB

Quadcopter main control board design schematic diagram and PCB

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2018 Electronic Competition Question C-Wireless Charging Electric Car (Xidian University)

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4A CNC regulated power supply design

Two outputs: 1: 0-30V/4A 2: 5V/1.5A (fixed output) Voltage resolution 0.458mV, current resolution 0.076mA Voltage step 0.0073V, the actual 0.1V step adjustment reset circuit is Both 51 and AVR are compatible. You can't solder all four original components. You can solder the reset circuit according to which chip you use!

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Single chip digital voltmeter design

Learning about microcontrollers is a small example of microcontroller design that is very suitable for beginners and should not be missed.

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2019 Electronic Competition H Question-Simulated Electromagnetic Curved Cannon (Henan University of Science and Technology)

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Smart home overall solution series: smart home management system design (schematic + APP + source code, etc.)

Smart home overall solution series: smart home management system design (schematic + APP + source code, etc.)

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Storage oscilloscope, fully functional and verified, for graduation project

Storage oscilloscope, fully functional and verified, for graduation project

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Twonkie: Open Source USB-PD Sniff, a USB-PD sniffer based on Google Twinkie

Supports data monitoring and PD packet injection on CC1 and CC2 lines, and voltage and current detection on VBUS and VCONN.

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Aeroh One: Crackable IR remote control based on esp32-c3 (schematic diagram and source code, etc.)

Aeroh One is a hackable infrared remote control pad that turns any remote control device into a connected device. It will support Alexa, Google Assistant, Apple Siri, iOS/Android App and IFTTT integration. The Aeroh One is compatible with most remote controls that operate via infrared.

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AC Ohmmeter mR-71 Remake

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Reverse Engineering and Repair of LeCroy High Frequency Active Probe HFP2500

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Complete solution for smart car design

Complete solution for single-chip smart car, circuit diagram, source code, and papers.

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

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GPS/GPRS logistics protocol vehicle terminal source program based on NXP LPC2387+UCOS-II

Version V0.2 Completed and verified functions: 1.GPS receiving function 2. Self-detection function 3. Login to server function 4. Reconnect to server function

Schematic PCB