基于單片機(jī)的籃球計(jì)時(shí)計(jì)分器設(shè)計(jì)自動化開題報(bào)告-免費(fèi)閱讀
【正文】 所以它可以輸入段選擇代碼。當(dāng)按鈕（ 4 4）與矩陣連接時(shí)， 8279 將其連續(xù)的鍵值從 0 到 15。 ?“CLR” 鍵：當(dāng)修改報(bào)警溫度時(shí)，按下鍵可以清楚的顯示。最后是 0 和 INT1 中斷開。當(dāng) A/D 轉(zhuǎn)換結(jié)束時(shí)，它發(fā)送一個(gè)信號 EOC 為轉(zhuǎn)換結(jié)束后，將收到由8051 INT1 結(jié)束后逆變 器，然后一個(gè)中斷請求 CPU將發(fā)送。這些繼電器實(shí)現(xiàn)光報(bào)警，聲音報(bào)警和高壓氮?dú)鉁缁稹Ｈ缓髮t外光線的強(qiáng)度降低，光敏三極管接收，和光敏三極管的阻力增加。這些信號包括灰塵，水，氣體和煙草煙霧。與現(xiàn)有的火災(zāi)報(bào) 警系統(tǒng)相比，該系統(tǒng)具有以下特點(diǎn)。 Introduction The use of fire has promoted the development of human society and civilization. But, fire out of control, ., fire hazard, has posed a serious threat to human life and property, and damaged greatly to the ecological environment that human survival depends on. In order to prevent fires and reduce fire losses, it has a great importance to develop a practical control system that integrating the functions of intelligent fire detection and automatic fighting. Compared with existing fire alarm systems, this system has the following characteristics. First, by integrating the detection functions of temperature sensor and smoke sensor, it can reduce the omission rate and false alarm rate. Second, the system can monitor flammable places conveniently due to the humanputer interaction system. Third, the system can realize multipoint data logging and enlarge alarm range. Last, the usage of highpressure nitrogen gas to extinguishing fire does not spoil the environment 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,
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