A low-profile version of full-featured software radio based on Raspberry Pi Pico (fully open source + detailed explanation)

With just a Raspberry Pi Pico, an analog switch and an op amp, you can build a powerful SDR receiver covering the LW, MW and SW bands. Capable of receiving signals from halfway around the world.

Schematic PCB

HDMI to MIPI module, mobile phone screen into display (produced by Zhihuijun)

The quality of mobile phone screens is very high and the price is low. It is almost impossible to find mini displays made of mobile phone screens on the market, so this project is to solve this demand.

Schematic PCB

A tiny FIDO2 security key for two-factor authentication and passwordless login

Somu is a small FIDO2 security key that you can use with your Google, Twitter, and GitHub accounts for two-factor authentication, or with your Microsoft account for passwordless login.

Schematic PCB

Make a USB-C power supply (understand the principles of USB-PD in depth, including schematics and English design instructions, etc.)

A simple power supply design based on USB-PD, USB-PD allows to provide voltage up to 20V (current up to 5A), the author shared his design details, you can have an in-depth understanding of the working principle of USB-PD.

Schematic PCB

MCU-based face recognition solution

The MCU-based solution for Face Recognition is a turnkey hardware and single source software solution for adding machine vision to products using the i.MX RT line of crossover processors.

Schematic PCB

200 W Game Console AC-DC Adapter GreenPoint® Reference Design

Small UAV based on Espressif ESP32-S2/ESP32

ESP-Drone can be connected and controlled through Wi-Fi network using mobile APP or game controller. Currently, it supports multiple modes such as self-stabilizing flight, fixed-altitude flight, and fixed-point flight. This solution has a simple hardware structure, clear code structure, supports function expansion, and can be used in STEAM education and other fields.

Schematic PCB

MCU-based local voice control solution

The i.MX RT with Built-in MCU-based solution for voice service is a turnkey hardware and single source software solution for adding voice control.

Schematic PCB

Novena: an open source computer based on Freescale and Xilinx FPGA, designed for use as a desktop, laptop or standalone board

Novena is a 1.2GHz, Freescale quad-core ARM architecture computer tightly coupled with Xilinx FPGA. It is designed for users who care about free software and open source, and/or want to modify and extend their hardware: all documentation for the PCB is open and freely downloadable, the entire operating system can be built from source, and it Comes with a variety of features that facilitate rapid prototyping.

Schematic PCB

QN9090DK: Development platform for QN9090/30(T) wireless MCU

Highly Scalable QN Wireless MCU Application Development Platform This development kit is enabled by the QN9090T which supports Bluetooth 5 and NFC.

Schematic PCB

255 W, 80PLUS® Silver Certified ATX Power Supply GreenPoint® Reference Design

OM13536: SA639DH Demonstration Board

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 charger

This is a reference design for a wireless charger. The working principle is: power transmission between objects through electromagnetic induction. A fully analog RL78/G11 microcontroller, ISL28006 current sense amplifier and HIP2106A MOSFET driver are used.

MCU-based Alexa voice service solution

The i.MX RT AVS solution based on Alexa Built-in MCU is a turnkey hardware and single-source software solution for adding voice control with Alexa.

Schematic PCB

Tah: Arduino-compatible BLE platform, which can be used as beacons, microcontrollers and HID devices (including schematics, source code, etc.)

Tah - Control anything from your smartphone, open source, Arduino-compatible Bluetooth Low Energy (BLE) platform that can be used as a beacon, microcontroller, and HID device.

Schematic PCB

60 W USB-PD and Quick Charge 3.0 Buck-Boost Reference Design Documentation Package

battery powered fluorescent lamp

Battery-operated fluorescent lighting projects often appeared in hobby electronic magazines in the 1980s. I always thought that fluorescent lamps were devices that only used AC power at that time. Those articles about using batteries to light miniature fluorescent lamps attracted me. I made some fluorescent lights, but I couldn't get good practical use out of them from a lamp efficiency and longevity perspective. That's because I was just reading the article and knew nothing about the theory of discharge lamps or even electronics. I don't know what to change to get good results, and I'm losing interest in it. However I found a battery powered fluorescent light project online that was identical to the schematic I was working on. So I "revived" the project after 30 years with modern driver circuits and correct theory.

Schematic PCB

BPW34 photodiode acts as a solar cell to make a supercapacitor watch (schematic diagram, etc.)

The standby time is acceptable and in good condition, more than 7 days.

Schematic PCB

PNEV512R: EXPLORE-NFC - Exclusively supplied by element14

EXPLORE-NFC - exclusively supplied by element14