1-Wire温度传感器在火灾报警系统中应用

1-Wire总线技术具有节省I/O资源、结构简单、成本低廉,便于总线扩展和方便维护等特点。文章中介绍了1-Wire总线技术数字温度传感器的基本特性与功能块图,数字温度传感器ROM命令和功能命令。阐述了1-Wire总线技术数字温度传感器供电方式。利用1-Wire总线技术使用多个数字温度传感器,实时时钟电路,键盘显示电路,串行存储器电路,RS485通信电路以及看门狗电路等,组成了火灾报警系统硬件系统。绘制了温度采集与处理流程图。采用多个传感器测量不同房间内的温度,可以设置不同房间的报警上限值,可以实现多个房间对应温度的显示和报警。1-Wire总线技术数字温度传感器已经成功地应用于火灾报警系统中。

Application of 1-wire Temperatur Sensor in Fire Alarm System

1-Wire technique can save I/O resource and has simple structure. It has low cost and the characteristic of bus spread and maintenance easily. This paper introduces 1-Wire technique basic characteristic and function flow of digital temperature sensor. ROM command and function command are described. The powering method of 1-Wire technique temperature sensor is expounded. Using 1-Wire technique temperature sensor, real time circuit, keyboard and display circuit, serial storage circuit, RS485 communication cir-cuit and watch-dog circuit make up of the hardware for fire alarm system. The temperature sampling and processing flow chart are drawn. Using many sensors can measure the temperature of different room. The alarm high limit of different room can be set up. Display and alarm of different room relative to definite temperature can be realized. 1-Wire technique digital temperature sensor has been applied in fire alarm system successfully.