"Portable information board", as the name suggests, displays the information you want to display on a device (screen) that you carry with you. The inspiration for this idea was that I met many elderly people who were lost before, but some of them were too old, had poor memory, forgot where their home was, couldn’t find their family members’ phone numbers, etc. (Although there are only a few, they are still exists, and China’s population is aging increasingly, so the proportion will inevitably increase).
With the vigorous development of national real estate construction and the increase in construction projects, the problem of dust pollution caused by construction has become increasingly serious. In order to effectively and quickly monitor the dust conditions at the construction site, we use a hardware platform to collect dust PM2 at the construction site. 5/pm10 content information, the dot matrix screen displays the content information on site, and transmits the pm particulate matter (PM10/PM2.5) content information to the China Mobile OneNet platform through the GPRS network, and the dust regulatory authorities can view the dust content information through the platform. And it can be viewed through the mobile phone, which greatly facilitates the monitoring and control of dust pollution.
According to my previous tests, the continuous read and write speeds of ST-Link V2 and Jlink V8 are around 160KB/S. However, most CMSIS-DAP debuggers are limited to full-speed HID and the speed is difficult to increase. The continuous read and write speed of DAPLINK+ OpenOCD The speed is only 23KB/S. At the beginning of the year, I tried to use NUC505 for CMSIS-DAP. 505 should be the cheapest integrated USB HS PHY microcontroller on the market. The high-speed HID message can be set to 1024Byte, and the sending and receiving interval is 125uS. There is no bottleneck in the USB part. However, its SPI module is very slow. After a transmission is completed, it will wait for several CLKs before triggering the completion flag. Even if the CLK is increased to 14MHz, the continuous read and write speed is only 150KB/S, which can only be said to be dead wood. It cannot be carved. The protagonist this time, GD32F350, I learned about it last year. I heard that it is the same price as GD32F150. The USB part has been changed to DWCOTG, and the execution speed of the last 32KB code will not be snail. After reading the datasheet in detail, I found that the internal 48M clock can be calibrated through the USB SOF signal, so that a crystal oscillator is not needed. The price is said to be as low as 30 cents in bulk. Well, it’s just so-so. Anyway, I bought 3pcs on Taobao for a total of 21 yuan. In general, it "seems" to be a super low-price solution, similar to the SPI design of the ST-LinkV2 main chip, and may be able to reach the mainstream speed indicator of 160KB/S, so it is worth a try.
The GD32F350 development board uses the latest ARM Cortex-M4 32-bit general-purpose microcontroller GD32F350RB launched by GigaDevice. This chip comes with a 2-way comparator and is very suitable for making a low-cost digital capacitance meter.
Mainly using GD32F350 to make a light source controller to provide stable light source control for machine vision cameras, adding an external trigger function that can be connected to an external 24V signal (photoelectric sensor or PLC input), and a 24V output signal to trigger the camera to take pictures. Due to the diversity of application scenarios here, it is necessary to add user process configuration to control how long and when the four light sources are turned on respectively. Due to the life of the light source and the general glare of the light source, a parameter power-off retention function is added. In addition, it is also extended WIFI function. Live application scenarios are also tested in the video.
This work is a simple pedometer design. It mainly uses MEMS sensors to detect changes in human body posture. It uses a pedometer algorithm to implement a simple pedometer function. It uses an OLED screen as a display device and adds a GY-30 light sensor module to detect changes in brightness of the surrounding environment. To adjust the OLED backlight brightness in real time; at the same time, the on-chip RTC is used to realize the real-time clock function. Due to limited time resources, it can be expanded later to add heart rate detection, temperature, humidity and air pressure, voice playback and networking functions.
This design only implements the establishment of the basic framework, such as protocols, business processing, task processing, upper and lower computer interaction data, etc., and abstracts interfaces one by one, and calculates the solar altitude angle and azimuth angle at this time through SPA. Simply use the obtained azimuth angle, altitude angle, etc. to convert the PWM duty cycle to control the corresponding rotation of the servo. There is actually a lot that needs to be done.
A single-lead ECG acquisition system based on GD32F350 is designed. The system uses a single-lead method to obtain ECG signals. Users only need to install the lead electrodes on their hands, and they can check their ECG anytime and anywhere without going to the hospital to specifically check their heart health.
With the help of GD32F350, the latest cost-effective arm processor launched by GigaDevice, the initial construction of a home security system can be realized. Effective communication of home conditions through sensors. With the help of OV5640 camera, pyroelectric sensor, raindrop sensor, etc., and relying on the hardware structure of GD32F350, a low-cost, high-accuracy home security solution is realized.
Main control chip: Hangshun HK32F030C8T6 Driver chip: two Toshiba TB67H450 (maximum current 3.5A) Encoder chip: Magone ultra-high-speed zero-delay AMR encoder MT6816 High-speed optocoupler: Toshiba dual-channel TLP2168 Working voltage: 12-30V (24V recommended) Operating current: Rated 2A (42 steps) 2.5A (57 steps) Maximum 3.5A Control accuracy: less than 0.08 degrees Electronic gear: 4, 8, 16, 32 (can be set arbitrarily)
WIFI remote can control the socket and monitor power consumption, etc. It has similar functions to Xiaomi smart socket, using TI's MSP series microprocessor as the main control.
An air purifier based on stm32f103rct6 chip can measure temperature and humidity and control fans.
The STM32MP157D-EV1 and STM32MP157F-EV1 Evaluation boards are the full-feature demonstration and development platforms for STMicroelectronics increased-frequency 800 MHz Arm®-based dual
The STM32MP157D-DK1 and STM32MP157F-DK2 Discovery kits leverage the capabilities of the increased-frequency 800 MHz microprocessors in the STM32MP1 Series to allow users easily develop applications using STM32 MPU OpenSTLinux Distribution software for the main processor and STM32CubeMP1 software for the co-processor.
The STM32MP157D-DK1 and STM32MP157F-DK2 Discovery kits leverage the capabilities of the increased-frequency 800 MHz microprocessors in the STM32MP1 Series to allow users easily develop applications using STM32 MPU OpenSTLinux Distribution software for the main processor and STM32CubeMP1 software for the co-processor.
The NUCLEO-WL55JC STM32WL Nucleo-64 board provides an affordable and flexible way for users to try out new concepts and build prototypes with the STM32WL Series microcontroller, choosing from the various combinations of performance, power consumption, and features.
The P-NUCLEO-IOD02A1 is an STM32 Nucleo pack composed of the X-NUCLEO-IOD02A1 and X-NUCLEO-IKS02A1 expansion boards stacked on the NUCLEO-L452RE development board.
With the in-depth research of ultrasonic levitation technology by domestic and foreign scholars, ultrasonic levitation devices have developed from expensive horns and other equipment to structures composed of general-purpose commercial ultrasonic transducers. Combined with 3D model printing technology, any scientific researcher and Electronics enthusiasts can use these components to make ultrasonic levitation devices to facilitate related acoustic research. This technology was published in AIP Publishing by Asier Marzo et al. Based on its model, this design changes the main control MCU, uses the timer inside the MCU to generate accurate PWM waves, and improves the software so that the ultrasonic device can move the suspension stably during the axial suspension movement. Small objects in multiple nodes.
High cell count battery (>15s) systems are increasingly used in industrial applications. These applications are more cost-sensitive and require a simple solution that can include monitoring, protection and control functions, and even SOC (state of charge) information, rather than just basic independent hardware protection. This reference design provides the platform for a complete battery pack side solution. Contains all independent hardware protection functions of the bq76930, and implements a reliable communication interface for the host device to read battery information.
The PMP20172 reference design delivers up to 36W on two USB Type-C outputs. Input is 17VDC bus. These two outputs enable port power management. If only one port is used, the entire 36W will be allocated to that port. If two ports are used, 18W will be allocated on each port. Supported output voltages are 5V, 9V or 15V.
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