STM32 Processor Research Articles

Control System Design and Precision Analysis of the Spring Testing Machine

The control system of the spring tension and compression testing machine is designed based on STM32 processor and touch screen. The signal of the pull-pressure sensor after conditioning is conversed by the 24bit A/D converter. The signal is operated real-timely with the encoder data, the setting value of the touch screen and the condition of the keys. The results are stored in the SD card. While the results are displayed on the touch screen. The anti-interference capability of the system is improved by the hardware and software anti-interference design. The reason of the measurement results smaller than the theoretical value is analyzed according to the tests results used of the calibration texting machines. Two aspects of the measures have been proposed to improve the measurement accuracy, including improving hardware stiffness and introducing distortion compensation amount.

Variable Frequency and Multi-Pressure Water Supply Control System Based on STM32 Processor

In this paper, a kind of variable frequency and multi-pressure water supply control system based on STM32 processor is designed. It can adjust the water pressure dynamically, according to the changes of water flow. Therefore, it can economize the energy consumption significantly. In order to improve real-time performance, the system adopts STs STM32F407 series processor which is based on ARM® CortexTM-M4 32-bit RISC core. It is used to collect the water flow, pressure and other data in real time, and automatically adjust the output frequency to control the motor speed, according to the set pressure value, and ultimately control the flow and pressure of the water supply system. According to the test, this variable frequency and multi-pressure water supply control system based on STM32 processor can meet the design requirements.

Real-time condition monitoring and fault diagnosis in switched reluctance motors with Kohonen neural network

The faults in switched reluctance motors (SRMs) were detected and diagnosed in real time with the Kohonen neural network. When a fault happens, both financial losses and undesired situations may occur. For these reasons, it is important to detect the incipient faults of SRMs and to diagnose which faults have occurred. In this study, a test rig was realized to determine the healthy and faulty conditions of SRMs. A data set for the Kohonen neural network was created with implemented measurements. A graphical user interface (GUI) was created in Matlab to test the performance of the Kohonen artificial neural network in real time. The data of the SRM was transferred to this software with a data acquisition card. The condition of the motor was monitored by marking the data measured in real time on the weight position graph of the Kohonen neural network. This test rig is capable of real-time monitoring of the condition of SRMs, which are used with intermittent or continuous operation, and is capable of detecting and diagnosing the faults that may occur in the motor. The Kohonen neural network used for detection and diagnosis of faults of the SRM in real time with Matlab GUI was embedded in an STM32 processor. A prototype with the STM32 processor was developed to detect and diagnose the faults of SRMs independent of computers.

High-Speed Acquisition and Filtering of Yarn Signal

We have designed a photoelectric yarn signal acquisition system, which is based on the STM32 processor, having a sample rate up to 270kHz, and uploading data collection through synchronous parallel communication mode; Owing to the large noise of yarn signal and the unobviousness of yarn defect, we respectively adopting wiener filter and mean filter to filter this signal; The simulation result of matlab has manifested that both the wiener filter and mean filter can effectively decrease the noise level of the yarn signal and make the nep defects easier to identify, and that the wiener filter applies to application where the yarn speed is higher , while the mean filter is appropriate to the lower speed spinner.

Research on Distributed Multi-Axis Motion Control System Based on CANopen

The 32-bit ARM Cortex-M3 core processor Stm32f107vc which integrates two sets of bxCAN interfaces is used as hardware platform to achieve the design of hardware module and software module in this paper. Firstly, real-time multi-tasking operating system μCOS-II is ported to stm32 processor, then open source protocol stack microCANopen which is high real-time and reliable is transplanted under the μCOS-II, so a design of CANopen slave station is achieved. The CAN analyzer which is equipped with monitor trace functionality is used as CANopen master station to start the network, with three CANopen slave stations and one HMI, a distributed multi-axis motion control system based on CANopen which achieves network management and synchronous transmission of data in distributed control system is designed. On above basis, Fuji ALPHA5 Smart servo is used as executive member, modular design of reconfigurable motion control algorithm is realized, furthermore, The flexible module configuration enables the designer to develop systems conveniently according to the change of control requirement and network topology. This distributed control system not only has good real-time performance and stability, but also can reduce the complexity, enhance the flexibility of control system and save cost.

Research of Water Shortage Information Detection System for Crop Growth

Precision irrigation is an important subsystem of precision agriculture, which is helpful to improve the water utilization of agricultural irrigation, so as to achieve the purpose of water conservation. For the issues of crop water shortage information timely and accurately, it designed and implemented a water shortage information detection system in the growth of crop based on canopy temperature and environmental factors. The system used the STM32 processor as the core, configured a variety of sensors, acquired and processed crop canopy temperature and various kinds of crops micro-environment information, obtained crop water shortage information through crop water stress index (CWSI), so as to guide the agricultural irrigation. The test proves that the system is working in good condition, can be effective for data acquisition and processing, so as to achieve the design requirements.

Research on the Implementation of Porting uC/OS-II on the STM32F103 chip

This work show how to port μCOS-II kernel and to build the ARM cortex-m3 hardware platform. This program researches how to drive the basic external devices. This paper gives a detailed discussion that the driver programs of the underlying hardware is how to be expanded into the uC/OS_II to process the tasks from the platform. The applications can make the STM32 processor work normally by calling the functions of transplanted uC / OS_II. The system is an actual embedded real-time multi-task operating system. The speed of processing multi-tasks is faster than conventional micro-controller’s. Because this system can run the highest priority task without return to the while loop. At last, this paper gives the structure of the main framework, the code of the tasks. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2839

Remote Ethernet Data Transmission System based on Hardware Protocol Stack Chip

Data acquisition and transmission based on the Ethernet is a very popular solution in many different kinds of monitoring system. This paper introduces a chip W5100 which is with network interface. The chip integrates TCP/IP hardware protocol stack and supports a variety of network protocols. The internal structure of the W5100 and its register function are introduced, besides that, the hardware circuit and the program design are given based on the STM32 processor. Focuses on the MAC address binding and resuming send program in multiple points building energy consumption monitoring system so as to enable quality of data transfer. At present, this data transmission system has been successfully applied in many building energy consumption monitoring projects, and the results show that the system is reliable and stability, and can satisfy the requirement of data transfer.

Design and Implementation of Remote/Short-range Smart Home Monitoring System Based on ZigBee and STM32

As the continuous development of Internet of Things (IOT), life intelligent gradually. Therefore, home devices of remote/short-range monitoring become the inevitable trend of development. Based on this background, the smart home monitoring system is presented based on the STM32 and ZigBee technology. The system uses a low-power-cost STM32 processor as the main controller and porting of µC/OS-II and µC/GUI on the system is achieved. The system uses a resistive touch screen as the human-computer interaction interface, combined with the ZigBee technology to achieve a short-range monitoring of home devices. The system transplanted and modified the procedures of UIP network protocol. The master controller is connected to the Ethernet and erected a WEB server, achieved the remote monitoring of home devices. And finally give the implementation details of the prototype system and functional testing.

Design and Implementation of LED Display Screen Controller Based on STM32 and FPGA

In order to realize point-light-source and hurdle lamp LED displays system, a kind of LED display screen controller design based on FPGA and STM32 is introduced by this paper. This design can quickly and easily receive display the data from USB, Ethernet and SD card interfaces through the STM32 processor, and use FPGA to realize data transmission throughput big operation of stable display by double RAM Ping-Pong operation This paper gives drive unit timing for TM1809 series LED drive chip as typical case. This design has applied to LED display controller with stability of reading data and excellent performance.

Research on Thermal Tactile Perception of Human Fingertips Using Temperature Control Device

The thermal tactile perception principle of human finger was analyzed. Based on STM32 processor, the high-speed, high-precision, adjustable temperature control device was designed. Using the temperature control device, thermal tactile perception characteristics in human fingertips were studied, including maximum temperature, minimum temperature, and comfortable relationship in fingertips, temperature resolution ability, temperature remembrance ability, waveform recognition ability of temperature variation. Experimental results are as follows. The temperature resolution ability is higher near the body temperature in human fingertips, and the temperature resolution ability reduces when the temperature is too high or too low. The perception accuracy of temperature memory can improve effectively after training, and the perception accuracy of continuous touch is higher than discontinuous touch. The recognition rate of square wave is higher than triangle wave in temperature waveform recognition.

The Design of Low Power Vibration Detection System Based on MEMS

The Design of Low Power Vibration Detection System Based on a three-axis accelerometer MEMS device, which can perform many functions: making long-term monitoring on the shock intensity in both vertical and horizontal directions, recording the shock peak and waveform. The system with STM32 processor, high-precision data acquisition, mass storage, USB and so on. Based on FatFS file system, the system concerned with the bad block management problems in NandFlash will be optimized and thus the reliability of the system will also improve.

Double Closed-Loop Feedback Controller Design for Micro Indoor Smart Autonomous Robot

In order to improve the control system performance of a Micro Indoor Smart Autonomous Robot, an embedded control system based on STM32 processor is proposed and a double closed-loop control structure is applied. The mathematical model is set up and kinematic model is simulated in Matlab/Simulink to estimate the PID parameters. Then the controller is experimented on robot and parameters are adjusted till getting good performance. The results show that the controller is stable and effective.