AUTOMATED POLYHOUSE

Sponsored by:Shriroz polyhouses, Pune

Under the guidance ofProf. C.B. Kadu

INTRODUCTION• Poly House is a climate regulated environment to

increase QUALITY& PRODUCTION of corp. • Microcontroller based system is a economical

option to achieve above requirements.• Manually Controlled System or Semi Automatic

Controlled System requires a lot of attention and care.

• Microcontroller based Control System is the solution to come over this problem and to maximize returns.

BASIC REQUIREMENTS OF POLYHOUSE

• Starting and closing of Micro Irrigation System.• Application of Liquid Fertilizer or Water Soluble

Fertilizer (N:P:K) and other Nutrients to the plant.• Operation of Misting System as required.• Opening and closing of ventilators and side wall

roll up curtains as needed.• Operation of cooling pad and fan.• Climate Control, Temperature, Humidity, Heat

Radiation, Control PH level in irrigation water etc. as required to the plant.

BLOCK DIAGRAM

PARAMETERS & CONTROLLING ACTION

Sr.No.

Parameter Control Action Description

1 Humidity(Air)

Sprinkler motor

Humidity drops below the set point then sprinkler motor turns ON. Droplets maintains Humidity

2 Wetness(Soil)

Drip system motor As water contain in soil decreases drip system takes control action according to schedule.

3 Temperature(Atmosphere)

Fan & Pad system Balanced environmental temperature inside the poly house.

4 Light Intensity(Photo synthesis)

Curtains Intensity of light is maintained by either curtain movement or auxiliary light source.

5 pH electrode (Liquid fertilizer)

Valve Actuator

Balances the % of water & fertilizer mixture.

SENSOR SELECTION

• Temp – RTD (PT-100)• Humidity – HS-220• Soil moisture – Metal probes• Light – LDR (LM-35)• pH- pH electrode

FAN & PAD SYSTEM

• Evaporative cooling is a process that reduces air temperature by evaporation of water into the airstream

• Fan and pad systems consist of exhaust fans at one end of the greenhouse and a pump circulating water through and over a porous pad installed at the opposite end of the greenhouse.

• Typical fan and pad greenhouse arrangement. The coolest area of the greenhouse is adjacent to the evaporative cooling pads. As this cooled air moves along the width of the greenhouse it picks up heat so that the exhaust air is warmer than the inlet air.

• Evaporative cooling pad. Water flows along the distribution pipe and drains down into the pad material.

Humidity Control

Set point

Light Intensity Control

Set point

pH Control

Se

t poi

nt

Temperature Control

Set point Set point

ADVANTAGES• Yield increases by 5 - 15 times or even more.• Reduction in labour cost• Less fertilizer requirement, thus reduction in fertilizer cost.• Low water requirement thus saving in water.• Less chances of disease attack, thus reduction in disease

control cost.• Higher Efficiency of Water & Fertilizer Use.• Cultivation in problematic topography.• Cultivation in problematic soil conditions.• Cultivation in problematic climate conditions.• Requires less area to get yield and benefits.• Easy to operate, maintain & control

FUTURE SCOPE

1)The Status of the different parameters can be displayed on the computer using serial interface with PC with the help ofRS232 Protocol.

2) The Records for the different readings can be maintained by adding memory chip in the system. It can be also stored in PC.

3) The Status of the different parameters can be send on Mobile through SMS to the concern person.

BIBLIOGRAPHY• www.srirozpolyhouse.com• www.jains.com• www.atmel.com• www.dallassemi.com

1) The 8051 micro controller -Kenneth J. Ayala2) The 8051 micro controller and embedded system – M.

Mazidi and J. Mazidi3) Atmel data book4) Operational Amplifier -Ramakant Gaikwad5) Basic Electronics -V.K. Mehta