REMOTE TEMPERATURE CONTROL SYSTEM FOR GREENHOUSE ENVIRONMENT

This study proposes a monitoring and control system of ventilation and temperature for greenhouse environment with both local and remote interface. For process control a Simatic S7-300 PLC is used. The control algorithms are based on conventional PID controller, positional control algorithm, and fuzzy logic controller. The final part of the paper highlights the obtained performances of each of the three control algorithms. The remote monitoring and control of the process are delivered through a web server implemented on Arduino Duemilanove microcontroller board with Ethernet capabilities that is connected to S7-300 PLC via analogical inputs and outputs of the specific modules SM331 and SM332. This is a solution that combines the advantages of both PLCs and microcontrollers.