儿童看护防走失电路设计.doc

儿童看护防走失电路设计 摘　要 在日常生活中，儿童走失的案例并不少见。很多案例都是因为儿童走远，而家长不知道，造成了儿童走失。如果儿童离家长的距离超过一定值时家长能受到提醒，则此类案例将会大大减少，因此本次课程设计将着手设计一款能够看护儿童防走失的电路。 本款儿童看护防走失电路，是通过监测儿童和家长的距离来实现儿童防走失的目的。在儿童身上和家长身上分别佩戴一个无限收发模块，一旦儿童与家长距离大于此模块的设定值，则家长身上的接收模块将收不到儿童身上佩戴的发射模块所发出的信号，此时接收模块发出报警信号，从而提醒家长重视儿童的行踪达到看护儿童防走失的目的。 本次设计主要包括设计基于PT2262/PT2272无线通讯模块的收发电路，它是采用数字无线电信号进行联络，其工作原件包括一个主机（接收器）和一个从机（发射器），主从机之间通过数字无线电信号进行联络，从机（发射器）电路由直流电源、数字编码电路和射频发射电路组成，主机（接收器）电路由直流电源、射频接收电路、整形放大电路、解调放大电路、数字解码电路和开关电路组成。采用上述技术方案可设计出工作可靠，性能稳定，抗干扰的收发电路。同时接收器给单片机发送信号，由单片机对其作出响应，单片机响应部分要用keil51给单片机编写相应的程序，并用Proteus软件来对单片机进行仿真。 关键词：单片机，PT2262，PT2272，防走失，无线收发 DESIGN OF ANTI-LOST CHILE CARE CIRCUIT ABSTRACT There are many cases of lost children in daily life, many children were lost because they are so far away, and parents do not know.If the distance of the children from the parent exceeds a certain value, the parents can be reminded, then such cases would be reduced significantly, so this will start to design a curriculum design to prevent children lost. This kind of anti-lost child care circuit is worked by measuring the distance between children and parents to achieve the purpose of childrens anti lost.?An infinite transceiver modules were wearing in children and parents, once the distance between the children and parents more than a set value, the receiver module will not receive the signals from the children who wear the transmitter module, and at this time?The alarm module will remind parents to take more attention to the position of the children to achieve the purpose of anti-lost children. This design includes the design of wireless communication module based on PT2262/PT2272 transceiver circuit, it is the use of digital radio signals to contact, their work includes an original host (receiver) and a slave (transmitter), the master and slave were contact via digital radio .the send circuit were composed by DC power, digital encoding circuit and RF transmitter circuit, the receiver circuit were composed by DC power supply