Open source headphone design based on RP2040 and PCM3060

All files are open source, including software, hardware and 3D printing shells, and how to make and assemble them are described in detail, especially the EQ equalization filter test and frequency response test are explained in detail. The main control uses RP2040 + TI 24-bit asynchronous stereo audio codec PCM3060 with 96/192kHz sampling rate.

Schematic PCB

OPen Book: a fully open source e-book that supports all languages ​​and breaks down working principles (schematics, PCB, source code, etc.)

Open Book is an open hardware device for reading books in all languages ​​of the world. It includes a large screen and navigation buttons, as well as audio options for accessibility and ports to expand its functionality. Its fine screen printing aims to demystify Open Book's own design, breaking down for curious readers how the book works and how they can create one for themselves.

Schematic PCB

snapVCC: 3.3/5 V ultra-efficient voltage regulator that mounts directly on your 9 V battery (schematic, PCB, etc. included)

snapVCC is a highly portable and convenient power supply for your electronics projects. It's designed to fit a 9V battery and provide you with 3.3V or 5V power wherever you need it. What can you do with snapVCC? Many circuits require a regulated 3.3 or 5 volt power supply. 9V batteries are an easily available power option. A common method of using a 9V battery to power a circuit is to use a linear regulator IC circuit to step down the voltage.

Schematic PCB

pmod-gnss：GNSS PMOD、GPS + Glonass

This design is a PMOD with the ublox NEO GNSS receiver footprint. Able to receive GPS and GLONASS simultaneously.

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Reading pen

Use a reading pen with a Renesas Electronics RL78/G14 microcontroller, ISL80505 single-output low-dropout linear regulator (LDO), and ISL6294 high-input voltage charger to read the code printed on the paper and play the corresponding Audio.

Open source 12-lead portable electrocardiograph

This open source has a complete host computer, slave computer and schematic diagram, as well as a detailed design paper.

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PYPRCA: python programmable open source calculator based on Raspberry Pi PICO, developed using circuitpython

Pocket calculator style general purpose programmable device (computer) ideal for learning programming and improving building/soldering skills.

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iphone6-5.5+ schematic.zip

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

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iPhone 5s Chinese schematic + component distribution diagram

Apple's full series of drawings: iPhone 5s Chinese schematic + component distribution diagram

Schematic PCB

CA-53W calculator watch

This computing watch is designed using the SAML22 ARM microcontroller. This particular microcontroller has a segmented LCD controller capable of driving the LCD used inside the watch.

Schematic PCB

Non-contact thermometer based on ESP8266

A low-cost, non-contact DIY infrared thermometer based on ESP8266 can help people measure their temperature safely and prevent the spread of the new coronavirus.

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Mobile power supply (adjustment OK program + schematic PCB diagram)

Mobile power supply (adjustment OK program + schematic PCB diagram).

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Design of forehead thermometer based on STM8S handheld non-contact infrared thermometer gun MLX90614 (schematic diagram, PCB, source program)

Based on the STM8S handheld non-contact infrared thermometer gun MLX90614 forehead temperature gun design, including schematic diagram, PCB, source program, etc.

Schematic PCB

the-little-bili-tv: Bilibili little TV based on ESP32

This Bilibili small TV uses esp32 as the main control, lvgl GUI interface design, and is developed based on idf4.0 to support smartconfig or WeChat airkiss distribution. Its functions include: network connection display, network acquisition time, weather display, temperature and humidity collection, Fan count display, mqtt temperature and humidity upload, etc. All software and hardware are open source.

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Mock Badge for the 2023 Hackaday Competition (Open Source)

This year, Supercon badges become analog badges! (Or at least pretend to be pretty convincing.) Taking inspiration from the fluorescent oscilloscopes of the past, the 2023 Vectorscope badge is part analog audio playground, part art project, and all about prototyping. Who doesn't love the warm glow and lovely green fluorescence of an old Tektronix tube scope?

Schematic PCB

SOCORAD32: A hackable open-source ESP32 amateur radio board with walkie-talkie functionality and data communications

The SOCORAD32, also known as the ESP32 Software Controlled Radio, is a professional grade hackable radio for amateur radio exploration, voice and data communications using simple AT commands. Just add a speaker and batteries and you've got a fully functional walkie-talkie. With a dedicated Push-to-Talk (PTT) button onboard, SOCORAD32 works right out of the box without touching a line of code!

Schematic PCB

Headphone charging compartment schematic design

The schematic diagram of the charging box, the basic functions are as follows: 1. Charge the battery inside the charging box 2. The charging box charges the earphones 3. The charging box communicates with the earphones

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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.

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ST programmable 65W USB Type-C PD charger reference design

This board is based on the ST-ONE main control chip and uses the M0+ core

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Microcontroller hand-mounted fan C source code and schematic diagram.rar

Schematic PCB