26-04-2014, 04:07 PM
THE DESIGN OF WIRELESS SENSOR NETWORKS NODE FOR MEASURING THE GREENHOUSE’S ENVIRONMENT PARAMETERS
THE DESIGN OF WIRELESS.pdf (Size: 357.03 KB / Downloads: 9)
Abstract:
Wireless sensor networks are integrated of sensor techniques, embedded
system techniques, distributed computation techniques and wireless
communication techniques. It’s a hot research area in the world. It will be
widely used in agriculture. This paper introduces the hardware and software
design of wireless sensor networks node for the measurement of greenhouse
environment parameters. These nodes can form networks themselves, measure
the environment parameters precisely, transfer data safely, and solve the
difficulty of wiring in greenhouse, making the earlier research of wireless
sensor networks used in greenhouse
INTRODUCTION
As a new cropper plant technology, greenhouse is not limited by many
factors such as plant zone nature environment climate and so on. It is
important for agricultural production. Greenhouse environment parameters’
measurement is a key tache of greenhouse’s automation and efficiency.
Sensors
In this system the basic detected parameters are air temperature, air
humidity, dew point, light irradiance.
Temperature, humidity and dew point are measured by SHT11 which is
produced by Sensirion Company Switzerland. The SHT11 digital humidity
and temperature sensor is fully calibrated, it offers long term stability and
ease of use at very low cost. The digital CMOSens Technology integrates
two sensors and readout circuitry on one single chip. Its measurement range
is 0-100% RH, accuracy is ±3%RH. Temperature range is -40 -+123.8 ,
and its accuracy is ± 0.4
(Wang Hanzhi, 2004). Base on the data of
temperature and humidity, we can work out the dew point precisely
(accuracy is ±1 ).
CONCLUSION
The design of wireless sensor networks node caters to the tendency of
sensor’s development: wireless and network. Bring the study of wireless
sensor networks node into the measurement of greenhouse environment
parameters, have solved a lot of difficulties in greenhouse.