Cross Strait Quad-Regional Radio Science and Wireless
Technology Conference, Vol. 2, p.p. 980 – 984, July 2011
Outline

 Abstract
 Introduction
 Overall design of monitoring system
 System hardware design
 Fuzzy PID control strategy and design
 System software design
 System test results and analysis
 Conclusions
 Reference
Abstract

 Aiming at the actual demand of environmental information
monitoring, an indoor temperature and humidity monitoring
system based on fuzzy-PID strategy is designed.
 The system uses CC2430 as the core to develop wireless
sensor nodes which follow the ZigBee communication
protocol, uses the data collection terminal with highprecision temperature and humidity sensor to collect
temperature and humidity data of the environment, uses
ZigBee technology to achieve networking of wireless
sensors and the automatic aggregation of monitoring data,
and uses the fuzzy PID control algorithm to improve the
accuracy of test data.
Abstract

 The indoor temperature and humidity regulation is achieved
based on fuzzy PID control technology. The management
function of various sensor nodes and a large number of
environmental data is achieved based on embedded database.
The monitoring results for temperature and humidity have
shown that this system is stable, high reliable in data
transmission and easy to use, and can be widely used in
various areas of automatic monitoring of environmental
parameters.
Introduction

 People's daily life is closely related to temperature and
humidity of the surrounding environment, and there are
also higher requirements for temperature and humidity in
industry, agriculture and other fields. Therefore, it has
become a very important technology on the temperature
and humidity monitoring and control in the production
process [1].
Introduction

 The layout of traditional indoor temperature and humidity
monitoring system are mostly wired communication, such
as field bus, distributed control bus, which is complicated
wiring and is not conducive to change and maintain the system
layout [2-4]
 An indoor temperature and humidity intelligent control
system is designed using wireless sensor network
technology, advanced computer technology, microprocessor
control technology and intelligent sensor data acquisition
technology. Data collection terminal is made up of the
CC2430 wireless communication modules, which can
monitor continuously onsite environmental temperature and
humidity in real-time.
Introduction

 Fuzzy PID control algorithm is applied to process
parameter values, which improve the control accuracy. The
PC in the monitoring center can effectively control the data
collection terminal and can display, storage, analysis and
process data in real-time, which achieve the control
purposes to the indoor environmental parameters.
Overall design of monitoring system

 A. System Requirements Analysis :
 Through investigation and analysis, the applications
of
environmental monitoring system include that the factors of
environment are sampled and processed in real-time in 24
hours and put into a database for the query, the sampled data
are transmitted and aggregated in real-time by low-cost, lowpower wireless communication in order to provide diagnosis,
limit alarm function, the intuitive system management
platform is provided to complete functions such as sensor
management, environmental information processing, storage,
analysis and so on, information is processed on the basis of
the detection, and control signals are formatted and output
based on predetermined control strategy.
Overall design of monitoring system

 B. System Architecture Design :
 The overall structure of system is shown in Figure 1, which
is based on ZigBee tree topology and includes sensor
nodes composed of ZigBee terminal nodes, gateway nodes
served by the ZigBee coordinator, and the monitoring
center composed of a PC and related management
software. The task of sensor node is to collect indoor
temperature and humidity and transmit the data to the
gateway node. Gateway node is responsible for receiving
data information and communicating with the
monitoring center by the serial port. The monitoring
center provides a graphical operating environment and
displays data for the staff to query
Overall design of monitoring system

System hardware design

Fuzzy PID control strategy and design

Fuzzy PID control strategy and design

Fuzzy PID control strategy and design

System software design

System software design

System test results and analysis

Conclusions

 Aiming at the disadvantage existing in the current
monitoring system of indoor environment, a real-time
indoor temperature and humidity monitoring and controlling
system based on ZigBee CC2430 and fuzzy PID strategy was
designed.
 The management system of indoor environmental parameters
based on embedded database can effectively manage various
sensor nodes and a large number of environmental data.
The system has the advantages of low-cost, low power, no
wiring, flexible networking and friendly interface and so on.
The results have shown that this system can promptly
detect changes in indoor temperature and humidity and can
control the decisions.
Reference
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