32U4 QMK numeric keypad

Introduction: QMK firmware numeric keyboard based on 32u4, no light, hot-swappable, type-c

Schematic PCB

MAME Mahjong Keyboard

Introduction: The keyboard is adapted to the simulator mame mahjong game and is hot-swappable. PC and Android box are tested and used normally.

Schematic PCB

STM32-core board to stlink

Schematic PCB

PC small keyboard, CH552 microcontroller HID keyboard, WS2812B lantern

Introduction: Adapted from the open source project: https://www.oshwhub.com/TheLight/zi-ding-yi-jian-pan, using RGB multimedia keypad produced by Qinheng CH552G microcontroller

Schematic PCB

USB volume controller_EC11_8LED

Introduction: USB Volume Controller

Schematic PCB

TDA2030 two-channel

Introduction: The sound effect of this board is tda2030, which is not too distorted. It is a two-channel system.

Schematic PCB

Portable mini speaker

Introduction: DIY portable small speakers with subwoofers on both sides have good sound quality! The double-sided metal design of shell printing and laser cutting is simple and elegant for pure MP3 playback!

Schematic PCB

Tuya graffiti smart universal remote control

Introduction: Tuya Smart’s zero-code development solution for universal remote control

Schematic PCB

PSF-B module remote switch

Introduction: 4-way WiFi switch using PSF-B04 module

Schematic PCB

Class-D Amplifier

Introduction: Class D power amplifier board suitable for TPA3118, TPA3116, TPA3130

Schematic PCB

MosRelay-OYF

Introduction: 5V or 3.3V controls MOS tube switch output (12V/24V), which can replace conventional contact relays and effectively prevent contact sticking problems.

Schematic PCB

Serial brushless motor 20200214

Introduction: Brushless ESC controller controlled by serial port

Schematic PCB

32768 resolution encoder-TLE5012

Introduction: Magnetic angle sensor, TLE5012, spi and IIF dual interface C123083

Schematic PCB

OldMonster Open Computer Project

Introduction: OldMonster Open Compuer Project

Schematic PCB

Logitech 613 expansion board

Introduction: The board is ready and the basic functions are normal. The hub tested and slept for five minutes. Several matrices did not trigger. It may be a soldering problem on my part. The Bluetooth blue cannot be turned on. It may also be a soldering problem. Several packages were not selected correctly, the dimensions were wrong, and the soldering failed. All problems will be improved in the next version.

Schematic PCB

Design of power measurement chip HLW8032

Introduction: Design of power measurement chip HLW8032

Schematic PCB

UV sensor (UV)

Introduction: UV Intensity Monitoring

Schematic PCB

Relay module

Introduction: One-way optocoupler relay module, active at high level.

Schematic PCB

XT2059 three-function charging board

Introduction: XT2059 charging module, the termination voltage can be set to 3.6V, 4.2V, 4.35V

Schematic PCB

Pentium shaver modified to be powered by lithium iron phosphate battery XT2059 charging

Introduction: The old Pentium shaver powered by nickel-cadmium battery is changed to lithium iron phosphate battery, and the charging IC uses XT2059.

Schematic PCB