The system monitors and controls greenhouse parameters like temperature, humidity, soil moisture, and sunlight using sensors, an analog-to-digital converter, microcontroller, and actuators. The sensors continuously sense the parameters and send the data to the microcontroller via the ADC. The microcontroller then takes corrective actions like turning on the water pump, cooler, or lights if a parameter exceeds its threshold. An LCD displays the parameter readings and status of the control actions. Test results found the system provides reliable and accurate monitoring and control with low power consumption.

1. DIGITALLY GREENHOUSE
MONITORING AND
CONTROLLING OF SYSTEM
BASED ON EMBEDDED
SYSTEM

2. OBJECTIVE
 To monitor and control the greenhouse environment parameters
effectively, it is to design a simple, easy to install, microcontroller-
based circuit to monitor and record the values of
Temperature,
Humidity,
Soil moisture &
Sunlight
of the natural environment to achieve maximum plant growth and yield.

3.  Introduction
 Features
 Basic model of the system
 Hardware description
Transducers
ADC
Microcontroller
LCD
Relays & Power supply
 Software
Keil software & Preload programming software
 Result analysis
 Conclusion
Contents

4. Low power
Low cost
Efficient chip
8K bytes of on-chip flash memory
An economical,
Portable and
A low maintenance solution
Features

5.  The system comprises of sensors, Analog to Digital Converter,
microcontroller and actuators. To eliminate the difficulties involved
in the agriculture by reducing human intervention to the best, the
sensors sense the change and the microcontroller reads this from
the data at its input ports after being converted to a digital form by
the ADC . The microcontroller then performs the needed actions by
employing relays until the strayed-out parameter has been brought
back to its optimum level. As the system also employs an LCD
display for continuously alerting.
Introduction

6. Basic model of the system
Sensors>>>ADC>>>Microcontroller>>>Interface>>>water
pump>>>sprayer>>>cooler>>artificial lights>>>LCD

7. HARDWARE:
Transducers
A transducer is a device which measures a physical quantity and converts it
into a signal which can be read by an observer. It can also be read by an
instrument.
1. Light Sensor (LDR (Light Dependent Resistor))
2. Humidity Sensor
3. Temperature Sensor
Analog to Digital Converter
We need an analog to digital converter (ADC), which is an electronic
circuit that converts continuous signals into discrete form so that the
microcontroller can read the data. Analog to digital converters are the most
widely used devices for data acquisition.
Microcontroller (AT89C51):
It constantly monitors the digitized parameters of the various sensors and
verifies them with the predefined threshold values . It checks if any corrective
action is to be taken for the condition at that instant of time.

8. Liquid Crystal Display:
Each monochrome pixels consists of a column of liquid crystal
molecules suspended between two transparent electrodes, and two polarizing
filters, the axes of polarity of which are perpendicular to each other.
Relays:
Because a relay is able to control an output circuit of higher power than
the input circuit, it can be considered to be, in a broad sense, a form of an
electrical amplifier.
Power Supply Connection:
The power supply section consists of the +5V and +12V power supplies
respectively.

9. SOFTWARE
KEIL SOFTWARE:
Keil Micro Vision is an integrated development environment
It is used to create software to be run on embedded systems (like a
microcontroller).
It allows for such software to be written either in assembly or C
programming languages.

10.  A unique feature of the Keil µVision3 IDE is the Device Database
 It contains information about more than 400 supported
microcontrollers.
Peripheral Simulation:
 The µVision3 Debugger provides complete simulation for the CPU and
on- chip peripherals of most embedded devices.
Device Database:

11. The programmer used is a powerful programmer for the Atmel 89 series of
microcontrollers.
Atmel 89 includes 89C51/52/55, 89S51/52/55 and many more.
Major parts of this programmer are Serial Port, Power Supply and
Firmware microcontroller.
Serial data is sent and received from 9 pin connector and converted to/from
TTL logic/RS232 signal levels by MAX232 chip.
A Male to Female serial port cable, connects to the 9 pin connector of
hardware and another side connects to back of computer.
Programmer:

12.  Preloads’ is a software
 It working as a user friendly interface for programmer boards from Sunrom
Technologies.
 The programmer connects to the computer’s serial port (Comm 1, 2, 3 or 4)
with a standard DB9 to DB9 cable.
 Baud Rate - 57600, COMx Automatically selected by window software.
 No PC Card Required
Preload ProgrammingSoftware:

13. Readings taken at room temperature of 270C
TRANSDUCER’S READINGS
 SOIL MOISTURE SENSOR
Tolerance= ± 0.2 V
 LIGHT SENSOR
Tolerance = ±0.1V
 HUMIDITY SENSOR
Tolerance= ±0.1V
FORMULA:
RH = ((Vout / Vcc) – 0.16)/0.0062, typical at 25°C where, Vsupply
= 4.98V
RESULT ANALYSIS

14. While designing the microcontroller based system for measurement and
control of the four essential parameters for plant growth, i.e. temperature,
humidity, soil moisture, and light intensity.
The results obtained that the system performance is quite reliable and
accurate.
A few shortcomings of the existing systems by reducing the power
consumption, maintenance and complexity.
At the same time providing a flexible and precise form of maintaining the
environment.
conclusion