The Design of the Multi-Channel Monitoring System of Temperature and Humidity Based on ADμC812

摘要

In this paper, the design of the multi-channel monitoring system of temperature and humidity(T&H)based on ADμC812 is introduced. ADμC812 is a high performance 8 bit single chip developed by AD Inc. with high precision ADC and DAC. Being given the block diagram of the multi-channel monitoring system of T&H, the design of hardware and software is also introduced. The monitor is composed of power circuit, analog multi-switch circuit, temperature sensor circuit, sampling and holding circuit, and A/D convert circuit, display circuit, keyboard scan circuit. Besides these，it can communicate to PC through RS232 interface to realize multi-distributing monitoring system of T&H, in order to monitor and judge input signal on real-time, at the same time it can realize displaying and printing and warning of data. Multithread technology and VB is used to the design of software and flow diagram of programming is given in this paper. Results show that the system has good effect on temperature control as well as its advantages are simple to design its hardware, low cost and low power consumption and small size.