The figure above has the Arduino board containing the micro controller which controls all
sensors in order to respond to stimuli. The temperature sensor detects
temperature in the greenhouse and compares to the preset temperature values. If
the detected temperature is higher than the preset temperature value, then the
cooling system is turned on in order to blow and cause a drop in temperature to
the required or set level. The soil moisture sensor determines the water
content in the soil; if the moisture is reading below the set minimum value
then the irrigation pump is turned on. The humidity sensor determines the
amount of water vapor in the greenhouse’s atmosphere, humidity and temperature
move hand in hand and thus turning on fans to blow out excess moisture. The
photometric sensor or light sensor determines how much light is coming into the
greenhouse, and if the levels are higher than preset then the shades are to
automatically be deployed to block off some sunlight. These shades are also
withdrawn when sunlight is required in the greenhouse.
Readings
from all the installed sensors and control devices will be sent and reflected
onto the Automated Greenhouse System desktop application from which the user
asserts control of the greenhouse.
THE EMBEDDED SYSTEM HARDWARE INTERFACE
It shows how the
different gadgets are arranged and connected with other gadgets on board and
how pins of the microcontroller are being used.
The light sensor detects the presence of
light by generating values as soon as in contact with flux from any light
source.
The humidity sensor determines the amount
of water vapor in the atmosphere and determines whether to optimize or blow out
at a certain percentage humidity.
The pump is used to pump water for
irrigation.
The tank is used to hold water for
irrigation.
The resistors (r1, r2, RV1) are used to
regulate the amount the current that flows through the electronic devices.
The ATmega 2560 board is used to connect
the different sensors through its pins and serial to the desktop application.
The 12 volts power supply powers the pump.
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