In today’s greenhouses, many parameter measurements are required to monitor and control for the good quality and productivity of plants. But to get the desired results there are some very important factors which come into play like Temperature, Humidity, Light and Water, which are necessary for a better plant growth. Keeping these parameters in mind I have built an Automatic Green House Controlling and Monitoring System over GSM module using Arduino. This system is very efficient for growing good quality plants. The other important part of this project is that it is fully automatic. Arduino automatically turns on and turn offs the appliances. 

Sometimes it is needed that the object should remain inline or in contact with other moving object. For example in satellite tracking system the dish antenna should always point to moving satellite to receive maximum signal. a slight deviation may also reduce the signal strength. In gun barrel position system for military tank or anti-aircraft gun once the target is…