AUTOMATION OF GREENHOUSES BY USING MICROCONTROLLER

Abstract

In this thesis, microcontroller(Atmega32) based system to monitor and control greenhouse temperature, humidity, and intensity of light is designed. Greenhouse is a kind of place which can change plant growth environment, create the best conditions for plant growth, and avoid influence on plant growth due to outside changing seasons and severe weather. In green houses there are a lot of parameters such as temperature, humidity, etc and it is so hard to monitor all of these parameters by human .And any significant changes in one climate parameter could have an adverse effect on another climate parameter as well as the development process of the plants. Therefore, continuous monitoring and control of these climate factors will allow for maximum crop yield, improve quality, regulate the growth period and improve the economic efficiency. The system comprises of microcontroller(Atmega32), temperature sensor (LM35), humidity sensor (HS1101),light sensor(LDR), LCD(2*16) and actuators(water pumps , heater, fans and lights). When any change in temperature ,humidity or light cross a safety threshold which has to be maintained to protect the crops, the sensors sense the change and the microcontroller read this from the data at its input ports after being converted to a digital form by the analog to digital converter to control the temperature, humidity and intensity of light by actuating water pumps , heater, fans and lights respectively according to the necessary condition of the crops . Parameters level sensed from the sensor will be displayed in the LCD. The result that obtained show that the system performance is quite reliable and has successfully overcome quite 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.