Figure 2. DHT22 AM sensor
5.6 Wireless Sensor Network
It is using a number of small sensor devices to
measure environmental characteristics and the
information was processed to create new knowledge
about the environment around us or automatically
respond to changes in the environment. Examples of
the use of this wireless sensor network are the
insertion of sensors into certain rare birds to detect the
temperature changes that affect the relocation of these
birds, the installation of sensors in large chemical
mixers or chemical pipelines in industrial plants for
chemical leakage, using many movement sensor
devices to detect the abnormalities of those
instruments so the abnormalities can take care of it
before it causes damage. Sensors are installed around
the airport to detect intruders in unauthorized areas.
From these examples, it can be seen that using a
number of different types of wireless sensor networks
is a very small sensor called a mote, developed by
Intel and University of California (UC) at Berkeley.
The mote is a small computer for measuring humidity
and temperature or other environment. It works by
using conventional batteries and communicating with
other nearby mote by adhoc wireless network for data
to be transmitted between the motes until it reaches
the destination that may be a computer or other
instruments that is used for measured data collection.
The wireless network causes a new computing
paradigm to be created called “proactive computing”,
which replaces the usual computer waiting for human
instruction but proactive computing will forecast the
environment that is needed by human needs and the
environment is able to operate in advance of human.
If necessary, proactive computing can occur due to
the wireless sensor enables the computer to
thoroughly and quickly receive information from the
real world without the need for human input.
Therefore, humans can proactively program the
computer to operate as soon as the environment is as
forecasted without having to wait for the instruction
from the computer similar to an interactive system.
5.7 Research Related to the
Development of Electronic Device
for Automatic Control
Kittisak Saengprasit, et.al. (2017) has conducted a
study and developed automatic control system for
Angel mushroom farms with the water level sensor to
control water level by using the resistance, high, and
low value to indicate the amount of water. The
measured values are then sent to the control board and
processed to send signals to the pump control for
controlling the water turning on – off in mushroom
farm. Additionally, humidity control with humidity
sensor then would send the value to the control board
and the signal is also sent to control the fog builder to
create the humidity. The information obtained from
the control board would be displayed on the LCD
screen. The dominant point of the system is it can be
used to automatically water level control and
humidity control. However, there are also
disadvantages in the aspect of the display system
would be the information being displayed on the LCD
monitor only. Additionally, the research conducted
by Kittiphong Niamnok, et al. (2009), has developed
a climate control system to be used inside straw
mushroom farm. The system would be able to
automatically control temperature and humidity and
ventilation. There is also system controlling water
turning on and off the water pump to reduce the
temperature inside the greenhouse.
Piyada Thonsungnoen (2017) Majoring in
Medical Devices, King Mongkut's University of
Technology North Bangkok has developed
temperature testing and sensor device that is able to
set the temperature through monitor and LCD
monitor. The displayed is on the LCD monitor. The
temperature is measured and stored in the SD
memory card with alarm being through light signaling
when the temperature inside the medicine cabinet is
abnormal.
Sirodom Ramang (2011), a student in Business
Information Technology Faculty of Information and
Communication Technology, Silpakorn University
has developed a climate control system with a case
study on Ban Het Sung Men by designing the system
to be able display the temperature and humidity
through the systemม display alerts when temperature
and humidity changes. The system can control the
operation of mushroom greenhouse equipment such
as ventilation fan, and water sprayer or turn off and
on the device to stop or work to control temperature
and humidity. The annual temperature and humidity
reports can be viewed daily in the form of
comparative graphs. Moreover, Thirayot Wangthong