Bluetooth technology analysis of the application of pneumatic valve controller

for pneumatic valve electric device is applied in the wireless communication technology, analyzes the common characteristic of wireless communication technology, is proposed based on bluetooth technology on the basis of the solution. In addition, a simple analysis of the three forms of bluetooth protocol stack, choose as the realization of an embedded bluetooth wireless communication model. Highlight handheld device bluetooth hardware and software in the process of operation, with the pneumatic valve electric device, wireless bluetooth communication module to realize the remote control operation. Bluetooth protocol specification to follow the open systems interconnection (OSI Open source system interconnection) Model. The realization of the bluetooth protocol stack, in accordance with the different package - of the model A stranger, embedded and embedded entirely different functions and product resources, respectively. Bluetooth protocol stack for embedded module, bluetooth module, application runs on the host, only through the communication protocol with bluetooth adapter module. Model without embedded bluetooth host upper agreement processing, reduce the host software and code length load, reduce the development workload and limited storage devices, is a good choice. In the design of bluetooth protocol stack in an embedded option model, through to the nanjing electronic technology co. , LTD. , spring KC bluetooth module, use, in order to ensure the reliability of communication, reduce the code form of CPU number of countries. In the field of industrial use bluetooth wireless communication, the system hardware design into two parts, in the operation of the pneumatic valve handheld electrical equipment. Pneumatic valve actuator to control pneumatic valve body. As the core, to establish the system of LPC, bluetooth module adopts industrial KC module. Is grace ARMTDMI - pu LPC S company is a high performance industrial microprocessor. A RISC processor core architecture, an instruction set with high density and low power consumption. KC bluetooth module for data exchange and voice communication of bluetooth communication module is available. It is small in size, size ten seven point eight mm in length, width. Mm; Management. V, a UART, SPI and USB UART serial interface of the processor and the bluetooth module used in the design of the voltage is connected. Handheld devices from bluetooth search function, the master-slave bluetooth, pneumatic valve actuator, pneumatic valve actuator and synchronous operation screen content link. The system architecture of AVR microcontroller ATmegaL as the core, including buttons, LCD screen, bluetooth module and a part of the main power supply. KC main bluetooth module is connected to the microcontroller through the serial port. Handheld devices and through the power of the power conversion chip, the embedded system AMSI voltage of the battery. Reset after the first handheld underlying hardware initialization, and then get the order to the corresponding action buttons. In the hardware design, single-chip PD and bluetooth module is connected to the link state port, PD ports and bluetooth module is connected to the reset pin. In the field of industrial pneumatic valve electric device is usually an array, and then correctly bluetooth node and link with the pneumatic valve electric actuator of handheld devices to communicate the key to create queries. The process including operating bluetooth adapter module handset MCU operation agreement. Because in the industrial field, there can be multiple pneumatic valves have bluetooth wireless communication, holding a contact into the physical link and logical connection of electrical equipment of pneumatic valve actuator. A logical link is a physical link, only handheld electric pneumatic valve actuator and equipment of the physical link between the subset of receiving and holding operations in the established indicator is the logical relation, confirm the link. Now handheld into pneumatic valve electric device operation and equipment synchronize their state. Pneumatic valve electric device can only passively accept operator search and link, the link state handling skills of TOP program is for the operator to determine the bluetooth network connection status. Collected data exchange function: a handheld device of the state of the pneumatic valve electric device query response time. Per ms, handheld operators will send the second query command, pneumatic valve electric device current state will be packaged for character data uploaded to the hand-held operation. Due to the data transmission will not contain xFF and xFE, data can be used as a start and end sign. Through carrying out the same data format, labelled a data analysis and synchronous display the state of the pneumatic valve electric device start and end tags. In setting state into the pneumatic valve and pneumatic valve electric device parameters of synchronous handheld devices, the length of the data frame is not fixed, according to the need to display in front of the data exchange in the book, the information on the page. The link is disconnected tip: when from interference or handheld electric pneumatic valve actuator and increase the external world, and disconnect the connection between the equipment, handheld operating hints given link is broken, the running state of the pneumatic valve electric device for wireless bluetooth, returns to the local operating mode. Pneumatic valve electric device of bluetooth in the practical engineering need to the introduction of wireless technology, analyzes the feasibility of the actual system implementation of hardware and software of wireless technology, the industry has a certain reference value.