基于单片机的篮球计时计分器设计自动化开题报告

基于单片机的篮球计时计分器设计自动化开题报告内容摘要：

nment and has good economic returns. Working principle of the system Parameters for fire detection This system chooses smoke and temperature as fire detection parameters. It has a plex fire detecting system posed of the smoke detector and the thermal detector. Composite detection can eliminate the interference and false alarm caused by nonfire signals which haven’t multiple signal parameters of the real fire. These signals include dust, water, gas and tobacco smoke. The overall system plan design The principle of the single chip microputer based automatic alarm and fire extinction system is shown in Figure 1. The system can be divided into two modules: signal acquisition module and signal processing module. Signal acquisition module Signal acquisition module consists of smoke detector, temperature detector and signal processing circuit. Smoke detector is mainly made up of infrared lightemitting diode and phototransistor. The light source is an infrared lightemitting diode, which generates highfrequency infrared radiation pulses by oscillation circuit. Phototransistor is fixed with a certain distance to the light emission point as an infrared receiver. When the fire occurs, a certain concentration of smoke enters the smoke detector. Then the intensity of the infrared light that the phototransistor received decreases, and the resistance of phototransistor increased. So the transistor bees conductive. After signal processing, the output voltage V1 decreases greatly. In the temperature detector with the positive temperature coefficient is used. After the fire occur, the temperature signal voltage V2 increases slowly along with the indoor temperature. Signal processing module The control part consists of the two major functional modules: A / D converter, the 8279 keyboard and the interface of the monitoring module. The smoke signal and the temperature signal after preamplifier get into the A / D converter. ADC0816 converts the analog signal into digital signal and sends to the CPU, which pares the digital signals with the settings in the program and determines whether to open the optical isolation so as to control the relays. These relays achieve optical alarm, sound alarm and highpressure nitrogen gas fireextinguishing. Connecting the 8279 chip with the CPU, an interface is expanded with a keyboard and an interface circuit of Monitor. The value of the alarm temperature is input through the keyboard and it will display on LED. Therefore, it achieves humanputer interaction and embodies the intelligence, which is another advantage of using microputer. Microcontroller circuit design the schematic diagram of the control circuit has been shown in Figure 2. It is mainly made up of the 8051 chip, 16channel A / D converter ADC0816, a 4 4 keyboard, a 4bit LED displayer and other interface chips In order to improve antijamming capability, several antijamming systems are designed relatively. The design of the interface between ADC0816 and 8051 chip in the system, interface circuit o。