ةيسدنهلا مولعلل ةرصبلا ةلجم
-
دلجم
17
ددعلا ،
1
،
2017
62
having to do it manually. Also, the plants may suffer from
bad circumstances like temperature and light. The major
objective of this paper is
to develop practical smart
greenhouse with three intelligent control systems in order to
obtain suitable circumstances. The proposed system has the
ability to monitor and control the greenhouse from any place
in the world. Fig. 1 depicts the block diagram of the entire
system.
The overall designed system could be divided into three
important parts; hardware, software, and IoT structure.
A. Hardware Design:
The system compromises numerous tools that are
utilized to obtain the desired system. The tools are explained
in two sections (Sensing and Actuators):
a) Sensing:
In order to apply the automation process on a given
system, sensors are required. The adopted intelligent control
system is fed by sensor information. Several types of
sensors are used including:
1) Temperature and Humidity sensor (Htd11): is new
advanced temperature moistness
sensor that has many
favorable circumstances, for example, small size, basic
interface, quick reaction, and inexpensiveness[8].
2)
The Soil humidity Sensor uses capacitance: measure
the water in a soil by computing the dielectric tolerance of
the soil, which is a component of the water [9].
3)
A Light Dependent Resistor (LDR) or a photograph
resistor: is a gadget whose resistivity is a component of the
occurrence electromagnetic radiation.
Subsequently, they
are light sensitivity gadgets[10].
b) Actuators:
The actuators could be defined as system that receive
control signal that categorized as low power signal usually
generated by the microcontroller to operate the devices that
require high Energy that may be voltage or currents
Fig. 1 Block diagram of the Greenhouse system.
The first system is Cooling/Heating system, the device
wanted to be controlled is the Thermo-electric cooler
(Peltier). This device operates on 12 VDC, the Peltier gives
warming in a specific direction of current and in opposite
direction gives cooling. The amount
of heating or cooling
depends on the current value and direction that passes to the
Peltier.
In order to satisfy the above conditions a design of
control circuit that was shown in Fig.2. This control circuit
gives suitable polarity and passing the required amount of
current by using Mosfet IRF640N.
The second system is the irrigation system. The DC
pump/Motor required to be controlled in this system. The
pump operates on 12 VDC, but the difference in this system
needs much less current than Peltier. For that purpose, L298
Motor driver are adopted, which provide 2 amperes as a
maximum. Fig. 3 shows the circuit
that used to control the
Pump.
The third system is the Light system. The object should
be controlled is LED board, which operate on 5 VDC. In
this situation is the same voltage of the microcontroller, but
if the LED Board drawing current more than the ability of
microcontroller. To protect the microcontroller, a Mosfet
IRF640N is utilized to drive the LED board. Fig. 4 clarifies
the control circuit for lighting LED board.
Fig. 2 Peltier’s Control Circuit.
Fig. 3 Pump’s Control Circuit.
Fig. 4 Light Control Circuit.
Basrah Journal for Engineering Sciences, vol. 17, no. 1, 2017 63
The prescribed control circuits
have been implemented
in real world. Fig.s (5,6, and 7) have been shown the
complete hardware system.
The irrigation system has been depicted in Fig. 5. Fig. 6
shows the hardware implementation of the light control
system. The temperature control system with actuators and
wiring should be illustrated in Fig.7.
Fig. 5 Irrigation system and sprinklers.
Fig. 6 LED Board and LDR
sensor.
Fig. 7 The Front-side of the implemented system.
B. Software Design (Fuzzy Controllers):
The proposed system uses fuzzy controllers, which is
effective
in numerous control issues, which may have a
problem if managed the system by using direct methods.
The fuzzy logic controllers depend on expert’s knowledge
or trial and error. Because of the linguistic expression of the
fuzzy controller, it has not been anything but difficult to
ensure the stability and robustness of the fuzzy control
frameworks. The Fuzzy controllers
are designed and
programmed in the single microcontroller, the execution
should be sequentially and pass the required information for
each fuzzy controller. In this paper, three fuzzy control
systems are implemented (Temperature Control System,
Irrigation Control System, and Light Control System).
Dostları ilə paylaş: