Abstract: This paper introduces a design scheme of steering wheel control system based on Bluetooth technology. The bluetooth transmission technology is used to realize the electronic optimization design of the steering wheel panel switch of the car, which overcomes the shortcomings of the need to look down for the switch in the traditional driving process, so that most operations are realized on the steering wheel, and the car driving is more convenient. The control system uses a Bluetooth module based on the BC219159 Bluetooth chip; the master control device uses STC89LE516 as a controller, collects and processes the signal of the button on the steering wheel and sends it to the Bluetooth chip for wireless transmission; the slave control device Bluetooth module receives the master control device After the signal, the slave control chip STC89C516 sends corresponding commands according to different signals to control the use of the four major systems of air conditioning, audio, cruise control, and lights in the car through the CAN bus. At the same time, it is connected to the LCD screen to facilitate the driver to control each Kinds of equipment. The system uses PWM to control the strength of each function, reducing hardware costs. Tests show that this system has the advantages of low cost, good reliability, high safety and strong versatility. 1 Introduction High-tech applications have changed people's lives. At the same time as cars are the basic means of delivery, people also hope that the driving operation of cars is simpler and more convenient, and they can communicate and communicate with the outside world in a timely manner. Bluetooth technology can provide technical support for the realization of this new type of automotive electronic information system. Bluetooth technology can be used to wirelessly connect various electronic devices on the car to form a "vehicle network". These devices include automotive electrical control equipment , Audio and video equipment, vehicle positioning and monitoring equipment, various sensors and their control systems, vehicle security systems and vehicle navigation systems. As a new type of short-range wireless spread spectrum communication technology, Bluetooth has the characteristics of small size, low power consumption, openness and interoperability. Compared with traditional data transmission by cable and infrared, it has the following advantages: (1) Strong anti-interference ability; when working on various electronic devices with wireless communication function, such as laptop computers and mobile phones with wireless Internet access, there is a large amount of electromagnetic interference to other electronic devices in the car. Bluetooth technology has the characteristics of fast confirmation and frequency hopping scheme to ensure link stability. It divides the frequency band into several frequency-hopping channels. In a connection, the radio transceiver continuously "hops" from one channel to another channel according to a certain code sequence. Only the transmitting and receiving parties communicate according to this rule, thus avoiding Interference; the instantaneous bandwidth of frequency hopping is very narrow, but this narrow bandwidth is expanded hundreds of times into a wide frequency band by spread spectrum technology, so that the possible impact of interference becomes very small. (2) The connection of signal lines is not needed, which reduces the cost and reduces the space occupied. (3) It has the basic characteristics of electromagnetic waves, has greater power, can increase the transmission distance, and has no restrictions on angle and directionality. It has wall penetration and can be reflected and diffracted between objects. (4) The power consumption is very low, many components can be connected at the same time, and the transmission speed is fast. The steering wheel control system based on Bluetooth technology introduced in this article adopts a wired and wireless network solution to form the entire control system. 2 System design This system realizes control functions such as constant speed cruise in the car, sound, air environment in the car, and headlight lighting through the buttons installed on the steering wheel. The control system is designed based on Bluetooth technology, and its hardware components mainly include Bluetooth master control device and Bluetooth slave control device. The master control device collects key signals through ZLG7289, and then sends them to the microprocessor STC89LE516 for processing. The microprocessor sends corresponding commands and data to the Bluetooth module BC219159B according to different key signals. The Bluetooth module uses the wireless network to connect the master and slave control devices. After the link is established between the Bluetooth modules, the instructions and data are transferred. The microprocessor of the slave device sends different instructions and data to the CAN bus according to the corresponding signals. Other on-board systems connected to the CAN bus implement related functions according to the instructions. LCD Display the status of various functions. The hardware block diagrams of the Bluetooth master and slave control devices are shown in Figure 1 and Figure 2, respectively. Figure 1 Bluetooth hardware block diagram of the main control device. Figure 2 Bluetooth hardware block diagram of the slave device. Shock Collar Charger,Dog Training Charger,E Collar Charger,Dog Shock Collar Charger Elite-tek Electronics Ltd , https://www.aetertek.ca
