ShaRPiKeebo: A small Linux computer with keyboard, daylight-readable screen and remote transceiver

ShaRPiKeebo is probably the smallest Linux computer you can find with a physical QWERTY keyboard. Measuring just 6 x 11 x 1.5 cm, it's powered by a Raspberry Pi (RPi) Zero W or 2W and features a 400x240 pixel, low-power, daylight-readable, black-and-white SHARP memory display and long-range wireless transceiver.

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

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.

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Arduino dual combination: based on iMX8 and STM32H747 development boards

Portenta X8 is a powerful industrial-grade SOM with a pre-installed Linux operating system onboard and can run device-independent software thanks to its modular container architecture. Securely perform OS/application OTA updates with onboard Wi-Fi/Bluetooth® Low Energy connectivity. It is basically two industrial products combined into one, with a power of no less than 9 cores. Utilize the Arduino environment to perform real-time tasks, while Linux handles high-performance processing. Portenta X8 features NXP® i.MX 8M Mini Cortex®-A53 quad-core up to 1.8GHz per core + 1x Cortex®-M4 up to 400MHz, and STMicroelectronics STM32H747 dual-core Cortex®-M7 up to 480Mhz +M4 32-bit Arm® MCU, up to 240MHz.

Schematic PCB

Based on STM32H747, Arduino® Nicla vision development board schematic

Arduino® Nicla Vision is a ready-to-use standalone camera for analyzing and processing images at the edge. It's suitable for asset tracking, object recognition and predictive maintenance thanks to its 2MP color camera, smart 6-axis motion sensor, integrated microphone and distance sensor. Quickly implement sensor nodes that send collected data to the Arduino® Cloud (or third-party vendor service) via integrated WiFi/BLE connectivity.

Schematic PCB

PiEEG: A brain-computer interface based on Raspberry Pi that can measure EEG, EMG and ECG biological signals

A Raspberry Pi board is used as the processor to process eight brain electrical signals in real time.

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Arduino UNO Mini Limited Edition Open Source Information

Open source material for the Arduino UNO Mini Limited Edition.

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TJBot, a DIY cardboard robot open sourced by IBM

Maker Kits are a set of DIY open source templates for building things using IBM AI services in fun and easy ways. IBM TJBot is the first maker kit in the series. You can 3D print or laser cut the robot's body and then bring it to life using the resources provided by IBM! Additionally, you can unleash your creativity and create new recipes, using any of the available IBM AI services to bring TJBot to life! TJBot only works with Raspberry Pi.

Schematic PCB

Filter circuit (various design solutions + schematic diagram).rar

Filter circuit (various design solutions + schematic diagram)

Schematic PCB

51 microcontroller control example of RTL8019 Ethernet (original program + schematic diagram)

51 microcontroller to RTL8019 Ethernet control example (original program + schematic diagram).

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UDP test based on STM32 and network chip W5200

UDP test based on STM32 and network chip W5200

Schematic PCB

Network card driver and LWIP protocol transplantation program source code for Ethernet communication module based on LPC2138 and DM9000AE

The network card driver and LWIP protocol transplant program source code for the Ethernet communication module based on LPC2138 and DM9000AE written by myself.

Schematic PCB

Broadband amplifier based on 51 microcontroller

This design uses the variable gain wideband amplifier VCA810 to increase the gain and expand the AGC control range, and uses software compensation to reduce the step interval of the gain adjustment and improve the accuracy. The input part uses a high-speed voltage feedback op amp 0 P A842 as a follower to increase the input impedance, and a protection circuit is added to the input part without affecting performance. Various anti-interference measures are used to reduce noise and suppress high-frequency self-excitation. The power output part is made of discrete components. The passband of the entire system is 4.4 k Hz ~ 8.4 MH z, with a minimum gain of 0 dB and a maximum gain of 70 dB. The gain step is ld B/6dB/arbitrarily set. The error between the preset gain and the actual gain below 60 dB is less than 0.2 dB. The effective value of the undistorted output voltage reaches 10.1 V, and the AGC control range is 52 dB when outputting 4.5 ~ 5.5 V.

Schematic PCB

Remote control ultrasonic ranging smart car based on arduino

The design uses an Arduino microcontroller as the main control chip to achieve distance measurement and display, and can intelligently avoid obstacles. The operating status of the car can be controlled through the remote control. Its structure is simple, easy to implement, the overall design is reasonable, the work is stable, the performance is good, and the detection Fast speed and easy to achieve real-time control are the design concepts of mainstream intelligent information fusion technology. It has powerful functions, modular design, strong portability, low power, and has a wide range of application fields and development prospects.

Schematic PCB

Gigabit Ethernet PHY and PC point-to-point communication procedures and corresponding tests

The physical layer data sending and receiving of a PC is very simple. As long as one condition is met, that is, the CRC check of the data packet is correct, the network card can send the data packet to the application software. Otherwise, the network card will directly discard the data packet, which cannot be caught by any software. to the data packet.

Schematic PCB