1 Division of Agricultural Engineering, IARI, New Delhi.
2 Phytotron Facility, IARI, New Delhi.
3 Electronics and Communication Engineering, Netaji Subbash Inst. of Tech. (Delhi University).
4 Electrical Engineering, Delhi College of Engg., (Delhi University), New Delhi.
A microprocessor based environment control system has been envisaged for greenhouses. Light control has been selected for this study. The controller will not only control the solar radiations but also indirectly, achieve a temperature balance inside the greenhouse. The automatic shading curtain has been designed using off the shelf components, with an 8-bit RISC micro-controller. An 8-bit AVR RISC controller with 1K Byte Flash (ATtiny15L) manufactured by ATMBL. The controller is designed to sense the light intensity and based on set limits it actuates a control motor to operate shade curtain open or close. The shade curtain is coupled mechanically with shade cloth mounting system.
