Puppies based on Hi3861 and PCA9685

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CVBS camera

A CVBS camera motherboard. Using South Korea's Persier sensor PC1058D, it has high resolution and low illumination

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Headphone amplifier based on OPA2188

It uses OPA2188 operational amplifier for large loop feedback and 2SC4672 as Class A and B output stage high-fidelity audio power amplifier, suitable for use with high-impedance headphones.

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usb keyboard and mouse dual use source code

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MP3 player source code schematic diagram using STC12C5A60S2

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Zhihuijun's new work: Hanwen smart keyboard with FOC force feedback knob, multi-function, modular mechanical keyboard (schematic, firmware, etc.)

The keyboard uses a modular design. The multi-functional scene interaction module on the left can be replaced with various custom components. By default, a Dynamic component with an e-ink screen and FOC force feedback knob is used; the keyboard body uses a shift register method to implement the key scanning circuit; The module and keyboard body can be used alone, or they can communicate and call each other through the serial port protocol.

Schematic PCB

Numato Opsis: FPGA-based open video platform

Numato Opsis is a powerful new FPGA-based open source video platform for videographers and visual artists. Opsis boards are designed to give users complete control over high-speed video, supporting everything from live meeting capture solutions to experimental visual art and even general FPGA-based video research.

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Dreamweaver 4N: Four-note sequencer (PCB, schematic, source code, etc.) for creating unique music in real time

Dreamweaver 4N is a four-note sequencer with potentiometers, allowing users to create their own unique music.

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The Skull CTF: Guessing Skull Game Tool

The Skull is a Capture the Flag (CTF) puzzle that invites you to explore the innards of the AVR architecture. It has multiple stages that may keep you busy for days or even weeks as you flex your brain muscles and apply them to her riddles. Unless, of course, your mind loses its grip on reality and you fall into a swirling void of madness with no anchor. In this case, it may take you longer. To keep your head above water, you need three things: the ability to read and understand Arduino code, a willingness to spend some time reading the ATtiny45 datasheet, and basic programming skills.

Schematic PCB

StereoPi v2: Open source stereo camera based on Raspberry Pi with Wi-Fi, Bluetooth and advanced power supply system (schematic, etc.)

StereoPi is an open source stereo camera based on Raspberry Pi. It can capture, save, live stream and process real-time stereoscopic video and images. StereoPi opens up countless possibilities in robotics, AR/VR, computer vision, drone instrumentation, panoramic video, and more.

Schematic PCB

Gameduino 3X Dazzler: Arduino expansion board for gaming and audiovisuals with GPU, FPGA, HDMI and Python support

The Gameduino 3X Dazzler is an Arduino-compatible expansion board that outputs high-definition images and sound to any HDMI monitor or TV. Dazzler is great for game designers using Arduino or CircuitPython, makers who want rich, responsive data and text visualizations, and anyone who wants great visuals for their Arduino projects.

Schematic PCB

PiMod Zero: Transform old TVs into RF video modulators based on Raspberry Pi Zero (schematic, source code, PCB, etc.)

PiMod Zero brings old technology back to life by allowing the Raspberry Pi Zero to display color or black-and-white video and play audio on vintage TV sets. It provides a super compact way to watch old movies, play retro games, display digital art or browse using any TV operating system that receives standard NTSC broadcasts on VHF channels 2 and 3 (55.25 MHz and 61.25 MHz).

Schematic PCB

Stereo Mic and Speaker HAT: A practical, colorful plug-and-play audio HAT for the Raspberry Pi

Stereo Mic and Speaker HAT is an audio HAT for the Raspberry Pi board with dual speakers and microphones for stereo audio playback and recording. HAT does not need to be installed as the onboard EEPROM dynamically loads device tree overlays. First, all you need to do is plug in the HAT and boot up the Pi. Make sure not to plug or unplug the HAT while the Pi is powered on and running, but really, it's that simple! By default the amplifier gain is +9dB, but the amplifier gain can be changed via the onboard pads by adding a small amount of solder. The compact HAT measures 65mmx30mm, which is the same size as the Pi Zero, Adafruit's bonnet HAT and Pimoroni's pHAT, making it easy to use the HAT for a variety of projects.

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EyeCloudAI CDK: Open edge AI camera kit compatible with OpenVINO and based on Intel Myriad X

EyeCloudAI CDK is an open source edge AI camera development kit for applications where privacy, real-time performance, reliability and flexibility are critical. Developing and deploying custom edge AI camera solutions becomes easy with this camera development kit (CDK). We've taken care of AI optimization, sensor tuning, optics, tooling and supply chain management so you can focus on your application.

Schematic PCB

PICO DSP: an open source, Arduino-compatible, ESP32-based audio development board

PICO DSP is an open source, Arduino-compatible ESP32 development board for audio and digital signal processing (DSP) applications. It provides an extensive audio processing feature set in a small, breadboard-friendly device, providing audio input, audio output, a low-noise microphone array, integrated test speaker options, additional memory, battery charge management and ESD protection all on a single micro PCB superior.

Schematic PCB

SlimeVR Full-Body Tracker: An affordable, comfortable, wireless, 360° virtual reality full-body tracking solution

SlimeVR is a set of open hardware sensors and open source software that facilitates full-body tracking (FBT) in virtual reality. Without the need for a base station, SlimeVR makes wireless VR FBT affordable and comfortable. SlimeVR FBT provides simple, effective body and limb tracking in VR games and other applications. It utilizes high-quality inertial measurement unit (IMU) sensors and a Wi-Fi connection to a PC instead of wires, cameras or base stations to make full-body tracking comfortable and affordable. Take the lower-body suit, for example, where five trackers—one on each thigh, one on each ankle, and one on the waist—are enough to get the job done. Each tracker monitors its own rotation in space, and the SlimeVR software uses your scale and headset position to calculate joint angles and estimate limb position. In more technical terms, SlimeVR relies on absolute orientation sensors, a configurable skeleton model, and forward kinematics. The result is like having virtual Vive trackers installed at strategic locations on your body.

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Mico: Open source, high-quality PDM to USB microphone based on Raspberry Pi RP2040 chip

Mico is a high-quality PDM to USB audio microphone based on the Raspberry Pi RP2040 chip. Most compact microphones available for embedded Linux systems such as the Raspberry Pi have high noise and low sensitivity. By pairing a high-quality PDM microphone with a standard USB audio output, Mico gives you an audio input platform that you can tailor to your needs. Mico is a great platform to learn and experiment with the RP2040 and digital audio. It can be used as a universal USB microphone for a Raspberry Pi, desktop or laptop computer. Mico can also be used as a high-quality USB audio input for embedded machine learning applications. Additionally, because TinyML supports RP2040, Mico can be used as a standalone edge computing audio device.

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DIY personal laptop

The author specially bought a laptop motherboard, and then DIYed the peripherals and casing. The overall effect is quite beautiful.

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25W-500W scalable output power Class D audio power amplifier reference design

25W-500W scalable output power Class D audio power amplifier reference design. Using IRS2092 protected digital audio driver

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15W Flyback Smartphone/Tablet Reference Design (5V/3A)

15W 5.0V high-efficiency USB adapter reference design board, using Infineon's quasi-resonant PWM IC ICE2QS03G with CoolMOS™ IPS65R1K0CE (IPAK) and secondary side synchronous rectification IC with OptiMOS™ BSC067N06LS3 G (ThinPAK), small size, high efficiency, Various protection modes can be provided for high-reliability systems.