BioAmp EXG Pill: Professional small, powerful analog front end (AFE) biopotential signal acquisition board (schematic, PCB, software, etc.)

The BioAmp EXG Pill is a powerful small analog front end (AFE) biopotential signal acquisition board that pairs with any microcontroller unit (MCU) or single board computer (SBC) with an analog-to-digital converter (ADC)) Such as Arduino UNO & Nano, Espressif ESP32, Adafruit QtPy, STM32 Blue Pill, BeagleBone Black and Raspberry Pi Pico, just to name a few. It also works with any dedicated ADC such as Texas Instruments ADS1115 and ADS131M0x etc.

Schematic PCB

cuplTag: NFC tag that records temperature and humidity (schematic, PCB, source code, etc.)

cuplTag is a battery-operated NFC tag that records ambient temperature and humidity. Tap it with your NFC-enabled phone and you'll see the timestamped reading appear in the web app. No configuration required, no application installation required, just one step!

Schematic PCB

ANAVI Gardening uHAT: open source smart gardening based on Raspberry Pi

ANAVI Gardening uHAT is a low-cost, open-source Raspberry Pi add-on board that helps you develop smart solutions for monitoring and growing plants. ANAVI Gardening uHAT supports multiple sensors for soil moisture, temperature, humidity, air pressure and light. Getting started is easy: Just plug it into your Raspberry Pi with your bare hands and follow the instructions in the user manual. No welding required and no tools required.

Schematic PCB

ThunderScope: Open source software-defined oscilloscope (schematics, source code, etc.)

ThunderScope is the first oscilloscope designed specifically for Thunderbolt, allowing live sample data to be streamed to your computer at over 1 GB/s. This design eliminates all limitations of traditional oscilloscopes by leveraging the powerful processing capabilities of modern devices. Measurements are made fast and easy, with cramped UIs replaced by multi-window layouts and support for modern accessibility features. Sample memory was increased from megabytes to gigabytes, and the fixed list of protocols and trigger types was replaced by an ever-expanding repo. ThunderScope is also open source, so you have complete control over your data from the moment you sample it. You can easily add your own custom features and benefit from new features built by the community.

Schematic PCB

Pellicanus: an open source INS/GNSS navigation development board (schematics, software, etc.)

Pellicanus is an open source, RP2040-based INS/GNSS module that you can program using MicroPython, C or Rust. It allows you to add Vertical Reference Units (VRU), Attitude and Heading Reference Systems (AHRS), and INS/GNSS capabilities to a variety of platforms: cars, drones, autonomous vehicles, and anything else you need to track. We'll Pellicanus is designed as a 33x30 mm toothed module that can be easily integrated into your project. We also offer carrier boards with a variety of interfaces so you can evaluate the module and start development immediately.

Schematic PCB

PlainDAQ: Simple open source DAQ module for Raspberry Pi Pico (schematic, source code, etc.)

PlainDAQ is a simple, useful tool that adds basic precision analog functionality to your Raspberry Pi Pico board. It features a precision, low noise, low drift 12-bit 500k sps/s ADC. To match the ADC and maintain its noise and accuracy, all analog inputs are buffered and the ADC is driven by a high speed/low noise fully differential amplifier. It also has a 10-bit DAC that helps create analog outputs and waveforms.

Schematic PCB

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.

Schematic PCB

acoustic-leak-detector: open source, battery-powered, long-range acoustic leak detection

AquaPing is an ultra-low power smart sensor that provides isolated water leak detection, even behind walls.

Schematic PCB

BeanCounter: Simple, battery powered, pocket-sized open source parts counter for 8mm cut tape and partial reels (schematics, source code, etc.)

BeanCounter is a pocket-friendly SMT parts counter. Powered by a CR2032 coin cell battery, it uses two infrared photointerrupters to count parts as quickly as possible. It works with any opaque, 8 mm wide carrier tape up to 2 mm, and it covers most 0805 or smaller LEDs and passives, as well as SOT23 transistors.

Schematic PCB

Blimpduino-2 - open source blimp (source code and schematics, etc.)

Bllimpduino 2 is a very low cost open source autonomous airship. It consists of Arduino M0 airship controller board and on-board WIFI and laser sensors. Two vector differential thrusters and one lift thruster. The design is simple, yet exciting.

Schematic PCB

Plant Bot: an open source project for caring for potted plants based on ESP32

Plant Bot is an open source project based on ESP32 that allows a single PCB to perform the functions of detecting humidity, watering, providing lighting, and controlling and communicating with the user via WiFi/BLE.

Schematic PCB

Wireless security camera based on ESP32

Have you ever wanted to install a security camera in your home, garden or office? Although commercial Wi-Fi security cameras on the market are not expensive, if you want to install multiple ones in different scenes or rooms, it will cost a lot of money. Young engineer Max can develop a wireless security camera based on Espressif's ESP32 chip with only $15.

Schematic PCB

Based on IFX007T BLDC motor and DC brush motor driver

This BLDC motor driver board is capable of driving one BLDC motor, or one or two bidirectional DC motors (H-bridge configuration, cascaded to support a second motor) or up to three unidirectional DC motors (half-bridge configuration).

Schematic PCB

High performance, high reliability bipolar stepper motor driver based on BD63731EFV

The project presented here is a bipolar stepper motor driver. It is based on the BD63731EFV chip, a low-power driver driven by a PWM signal. The project power supply voltage is 8~28V DC, and the rated output current is 3A. The input interface adopts CLK-IN drive mode, and the excitation mode corresponds to FULL STEP mode (2 types), HALF STEP mode (2 types), QUARTER STEP mode (2 types), 1/8 STEP mode, 1/16 STEP mode through the built-in DAC . In terms of current attenuation, the SLOW DECAY/FAST DECAY ratio can be set without any restrictions and all available modes can be controlled in the most suitable way. Additionally, the power supply can be driven by a single system, simplifying design.

Schematic PCB

DIY handheld gamma ray spectrometer based on Raspberry Pi Pico

Although Geiger counters can be used to detect amounts of radiation, and with some tricks can also differentiate between the three types of radiation (alpha, beta, and gamma), their use is limited in identifying radioactive materials. For this purpose, gamma-ray spectrometers come in handy.

Schematic PCB

Magically modify your computer power supply to make a beautiful desktop power supply, simple and practical

You can certainly buy desktop power supplies, but they're not cheap. As the current capacity and output voltage quantity increase, so does the price. While a commercial desktop power supply is certainly worth the investment, you may want to consider a cheaper solution. Adapt an old computer power supply for use on your workbench. Computer power supplies have all the voltages you need and some very impressive current capabilities.

Schematic PCB

Open source development tool USB-Cereal

USB-Cereal is a powerful, fully open source development tool that simplifies testing, development, debugging and manufacturing of devices using USB-C. Using the extended capabilities of USB-C, this unique hardware saves time and effort by simplifying debugging and factory log capture, as well as firmware update procedures.

Schematic PCB

Hotplate Soldering Iron: Repurpose an old electric iron into a heated soldering station

The basic concept of this work is slightly different from standard tools such as a reflow oven or soldering iron. Heat is provided from the bottom of the PCB.

Schematic PCB

Fully open source reflow soldering Reflow-Controller: based on ESP32-S2, magic oven modification

Reflow-Controller is designed to control different types of reflow ovens, hot plates, etc. It's based on the ESP32-S2, so it can be programmed to work with WiFi applications, but it also has an onboard OLED display and three buttons for use as a standalone solution.

Schematic PCB

100W LED driver evaluation board using high-frequency LCC transformer to achieve low-cost and miniaturized design

This 100 W reference design highlights the excellent power quality and high frequency performance of the half-bridge (HB) driver using the ICL5102 with the economical CoolMOS™ P7 series. The design takes full advantage of the applicable frequency range of the HB driver to create Highly compact LCC transformer. This transformer integrates the series inductance of the LCC resonant tank. Relying on this high power density transformer design, the high frequency operation capability can drive system cost and size reduction.