数字温度计的设计

Design of digital thermometer

根据目前温度传感器的数字化和温度表的发展现状,研究和设计了一种基于51系列单片机的数字温度计。数字温度计控制电路的核心是基于51系列中ATMEL公司的8位单片机AT89C51。测温传感器采用了新型单线数字温度传感器DS18B20,不需要专用A/D转换电路来实现温度量由模拟量到数字量的变换,并可与单片机直接连接。同时,系统的显示部分采用4位LED串行动态显示,用74LS373的输出信号分别作为LED的位驱动信号和段驱动信号。该数字温度表实现了对温度采集、处理、实时显示,并可实现对测温系统的温度控制。

According to the current situation of the temperature sensor digitalization and the thermometer, a digital ther- mometer based on 51 series MCU is researched and designed this paper. The core of digital thermometer control circuit is the 81〉bit single-chip microcomputer AT89C51 in ATMEL 51 series. The new singleline digital temperature sensor DS18B20 is adopted in the temperature sensor. It does not require a dedicated A/D conversion circuit to achieve the temperature transform from analog to digital, and is directly connected with the single-chip microcomputer. There is four-figure LED serial dynamic display in the display section of the system. The output signal of 74LS373 is taken as figure drive signal and segment drive signal for LED. The temperature acquisition, processing and real-time display were realized in the digital thermometer. The temperature control of the temperature detection system was also achieved.