范文编号:JD850 论文字数:10234,页数:24 摘要 本设计,要实现一个分优先级的病床呼叫系统。通过优先编码器74148对模拟病房号编码,再通过发射器VD5026和接收器VD5026进行编码和解码,将病床呼叫信息传送到医生值班室。当有病房呼叫时信号通过逻辑门低电平触发由555构成的单稳态触发器从而发出5秒钟的呼叫声,同时通过数码管显示器显示病房号,由呼叫信号控制晶闸管从而控制对应病房报警灯的关亮。以上按复位键R可复位。 关键词:病床呼叫器;74148;发射器;接收器;555定时器 Abstract This design, must realize a priority hospital bed ringing system. Simulates the hospital ward number code through the first encoder 74148 pairs, again carries on the code and the decoding through launcher VD5026 and receiver VD5026, hospital bed call information transmission to doctor duty officers observation room. When has the hospital ward calls the signal through logical gate low level triggering by 555 constitution monostable triggers, thus exudes 5 seconds cries, simultaneously demonstrates the hospital ward number through the nixietube monitor, by calling signal control thyristor, thus controls Guan Liang who corresponds the hospital ward warning light. The above presses replacement key R to be possible to reposition. This system has the perform reliably, the principle simple merit. key word: Hospital bed callmaker; 74148; Launcher; Receiver; 555 timers
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