基于单片机的门禁系统的设计
基于单片机门禁系统的设计
学号:B11040926
姓名:宁志杰
日期:2014.12.31
Colorimetric tube 1 0 mL glass. 4, the analysis step preparation of the sample solution: precision weighing approximately 0.01 g~1.0 g sample (accurate to 0.0001 g) in 1 ... V2--determination of sampling volume. Unit ml (mI. ); M--quality of the sample, expressed in grams (g); The atomic weight of 55.84--Fe; 2--conversion factors. 6, precision
under repeatability conditions to obtain the absolute value of the difference of two independent test results shall not exceed the arithmetical average of the 10%. Food additives sweet agent [saccharin sodium, and sweet pigment, and acetyl sulfa acid potassium (Ann game honey], and coloring agent of test according to focus introduced anti-oxidant of detection (BHA, and BHT, and PG, and TBHQ),] GB2760
GB/T5009.30, and GB/T5009.32, and GB/T5009.35, and food in the often using of anti-oxidant main has BHA, and BHT, and PG, and TBHQ tert-butyl hydroxy fennel ether (BHA) 2,6-II tert-butyl on cresol (BHT ) Of tert-butyl hydroxy anisole (BHA) 2,6-di-tert-butyl-p-cresol (BHT) testing in accordance with GB/T5009.30 vapor phase chromatography and thin-layer chromatography, this section focuses on Colorimetry. Principle 1, obtained by steam distillation of the sample. separate the BHT, methanol
absorption, o-anisidine and sodium nitrite solution orange-red, extracted with chloroform, compared with standard sizing. 2, anhydrous calcium chloride reagent. Methanol. Chloroform. Methanol (50%). Sodium nitrite solution (3 g/l): keep in dark place. O-anisidine solution; weighing 125 mg o-anisidine in 50mL the second Brown volumetric flask, add 25mL methanol and shake to dissolve, and 50mg activated carbon, shake
基于单片机的门禁系统的设计
摘要
门禁系统采用89C52 单片机作为控制核心，外围加蜂鸣器控制电路、开门指示灯电路、电控锁控制电路以及LCD液晶显示电路等。门禁系统主要由CPU、工作指示电路、振荡电路、蜂鸣器电路、门控锁电路、矩阵键盘、读卡模块、显示模块等组成。该门禁系统采用射频卡完成刷卡进门，按刷卡出门等功能。其工作原理为:当刷卡时，蜂鸣器响一下，如卡权限获得允许，显示模块显示卡号，同时继电器动作将门锁打开，指示灯点亮，延时一段时间后继电器再次动作将门锁锁闭，指示灯熄灭。当按下出门按钮时，继电器动作将门锁打开，指示灯点亮，延时一段时间后继电器再次动作将门锁锁闭，指示灯熄灭。当输入初始密码时，若输入正确，继电器动作将门锁打开，指示灯点亮，延时一段时间后继电器再次动作将门锁锁闭。此外，程序中还增加了射频卡权限判断的功能，当遇到合法卡时显示卡号，门锁打开，延时10s自动关闭，当遇到非法卡时不显示卡号门锁不开。本系统设计简单、性能优良，具有一定的实用性。
关键词:门禁，射频卡，电控锁，液晶显示，单片机控制
Colorimetric tube 1 0 mL glass. 4, the analysis step preparation of the sample solution: precision weighing approximately 0.01 g~1.0 g
sample (accurate to 0.0001 g) in 1 ... V2--determination of sampling volume. Unit ml (mI. ); M--quality of the sample, expressed in grams (g); The atomic weight of 55.84--Fe; 2--conversion factors. 6, precision
under repeatability conditions to obtain the absolute value of the difference of two independent test results shall not exceed the arithmetical average of the 10%. Food additives sweet agent [saccharin sodium, and sweet pigment, and acetyl sulfa acid potassium (Ann game honey], and coloring agent of test according to focus introduced anti-oxidant of detection (BHA, and BHT, and PG, and TBHQ),] GB2760
GB/T5009.30, and GB/T5009.32, and GB/T5009.35, and food in the often using of anti-oxidant main has BHA, and BHT, and PG, and TBHQ tert-butyl hydroxy fennel ether (BHA) 2,6-II tert-butyl on cresol (BHT ) Of tert-butyl hydroxy anisole (BHA) 2,6-di-tert-butyl-p-cresol (BHT) testing in accordance with GB/T5009.30 vapor phase chromatography and thin-layer chromatography, this section focuses on Colorimetry. Principle 1, obtained by steam distillation of the sample. separate the BHT, methanol absorption, o-anisidine and sodium nitrite solution orange-red,
extracted with chloroform, compared with standard sizing. 2, anhydrous calcium chloride reagent. Methanol. Chloroform. Methanol (50%). Sodium nitrite solution (3 g/l): keep in dark place. O-anisidine solution; weighing 125 mg o-anisidine in 50mL the second Brown volumetric flask, add 25mL methanol and shake to dissolve, and 50mg activated carbon, shake
洛阳理工学院毕业设计(论
