关键词: 单片机, RS485协议, DS18B20数字传感器

Abstract:

This paper presents a real-time multi-point temperature detection circuit design with ATMEL AT89S52 MCU and DALLAS DS18B20 single-bus digital temperature sensor as the core.The detection units can functions independently with timing acquisition of temperature according to the next-bit machine instruction.The real-time temperature measurement results are displayed locally,and the relay is disconnected if the value goes beyond in the security limit.The collected data can be sent to the host computer when necessary via single-chip serial port using an RS-485 bus and communication protocols for archiving and disposal.

Key words: SCM;RS485 protocol;DS18B20 digital sensors