Nowadays, almost all circuit boards use surface mount packaging, so I have always wanted to DIY a chip placement machine. After searching online for a long time, I finally decided to use the open source OpenPnP. The hardware and software are both open source.
It is mainly composed of the basic functions and structure of the professional electric energy measurement chip ATT7022B and the single-chip computer MSP430F149 system. In terms of hardware circuits, the electromagnetic compatibility of the circuit is fully considered in the circuit design. A more reliable power supply for electric energy meters is designed to improve the ability to withstand lightning strikes. And it is proposed to use EPROM to store data in order to achieve the purpose of simplicity and security. In the particularly critical communication unit of the electronic energy meter, multiple communication methods such as serial communication and wireless communication are designed to connect scattered electricity meters into a network to achieve centralized control and remote meter reading functions. In addition, a GPS module is designed to locate the coordinates of the collection point.
Dimebots are a group of autonomous, independent micro-robots that are as small as a dime, making them among the smallest robots in the world.
The schematic diagram is open source, you can see if there is anything worth learning from. This baseboard is designed for their previously launched H7 core board.
Smart car schematic diagram + PCB diagram (formerly the second prize in the national award)
Loko is an open source, battery-operated GPS tracker. It's a small, simple, and useful device that sends navigation data to its receiver via a peer-to-peer LoRa radio. Unlike other similar technologies, there are no ongoing costs. Loko is based on radio communication and requires no SIM card/monthly fee. It also works everywhere, even without 2G/3G/LTE coverage.
This is a very simple open source scanning laser rangefinder. It uses triangulation. Its components cost less than $35 (excluding shipping). This lidar is very useful in robotics - for SLAM and navigation tasks.
IndyMill is an open source DIY CNC machine
CaribouLite is an affordable open source dual-channel software-defined radio (SDR) platform and an SDR-focused FPGA development framework implemented as a Raspberry Pi (RPi) HAT. CaribouLite turns your Raspberry Pi single-board computer (SBC) into a standalone dual-channel radio Tx/Rx with a tunable spectrum up to 6 GHz. CaribouLite gives you complete control over its hardware, including FPGA, firmware, and all supporting software. With the deeply integrated IceStorm toolchain, writing your own FPGA applications couldn't be easier. You can reuse many Verilog modules, such as the SPI and SMI modules, to support custom applications for CaribouLite hardware.
The ultrasonic ranging system based on a single-chip microcomputer measures the output pulse width, that is, the time interval between transmitting and receiving ultrasonic waves. It controls the peripheral circuits in a timely manner through the single-chip microcomputer and provides signals such as frequency oscillation, data processing, and decoding display to the peripheral circuits. The ultrasonic transmitting circuit includes a gate control circuit (RS flip-flop) and a differential/shaping circuit, while the receiving circuit consists of receiving, amplifying, signal filtering, and shaping circuits.
Genesis One uses STM32F103RCT6 as the main control, integrating lithium battery charge and discharge management, voltage stabilization, Bluetooth serial port HID, USB-HID, LED light array driver, and button detection circuit. It can realize Bluetooth connection mode (supports IOS, Android and other platforms) and USB connection mode. The response time of Bluetooth connection is about 15ms, and the response time of the master control in USB connection mode is about 0.3Ms.
Ported the 3D rotation + meteor shower background demo to H7, and the pure rendering is very smooth.
Protues simulation example (8051)-stepper motor C version
This article introduces the framework structure and component modules of the design as well as the principles of each module. It also introduces the hardware design of each part, the software design of each part, and the software flow chart. The design is an intelligent LED desk lamp integrating multiple functions with STC89C52 microcontroller as the control core. The desk lamp realizes the function of automatically detecting whether there is someone in the room and automatically turning on/off; the desk lamp brightness has an adjustment function; it has a time display function; it has a temperature display function; and it has an alarm function. The hardware design is divided into eight parts, including the microcontroller control module, button module, desk lamp module, temperature module, clock module, alarm module, display module, and infrared sensing module. The microcontroller control uses STC89C52, the display module uses LCD1602C liquid crystal to display temperature, time, date, etc., the button module is used to adjust time, date, LED brightness, etc., the clock uses DS12C887 clock chip, and the desk lamp module uses 16 LEDs and uses a buzzer. The device emits an alarm sound, the temperature sensor uses a DS18B20 chip, and the human detection device uses a BIS0001 infrared thermal sensor. The software design is written in microcontroller C language and realizes all control functions.
This smartwatch can measure linear acceleration, rotational speed, heart rate and SpO2 (oxygen saturation) of the hand
FreeEEG32 is a stackable, open source, 32-channel, 24-bit, sigma-delta, simultaneous sampling board designed to meet the needs of scientists and brain hackers who require high-quality, affordable research-grade equipment. We have been developing this EEG for many years as we worked to create the ultimate open source solution to expensive proprietary EEG technology. FreeEEG32 combines four 8-channel AD7771 ADCs with ultra-low noise (<0.22 μV measured) sources and references, all driven by the powerful STM32H7 ARM Cortex-M7, while handling pre-processing. It's sensitive enough to handle high-quality EEG data collection and more.
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.
The board of this design is intended to sit between the fundamental and harmonic boards and monitor the SPI data running to the display. Onboard ECP5 will mirror the display and output a copy to a digital monitor.
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