The document describes an automatic cellphone detector system that uses a frequency sensing coil to monitor an area for cellphone frequencies when SMS messages or calls are received. When a cellphone frequency is detected, the system sends a command to a controller displaying information about the cellphone user to the operator. This allows for detection of theft or unwanted interruption from cellphones in silent mode.

1. AUTOMATIC CELLPHONE DETECTOR
ABSTRACT
Restrictions are placed in everywhere, but it is the habit to break them. The size of mobile
phones is much more compact in recent trends. So it is easy to carry them everywhere. These
cannot be detected if they are operated in silent mode. A system is necessary to automatically
detect them when they are operated by identify its frequency.
In this project a method to find cell phones using the frequency sensing coil is implemented
here. The cell phones have a particular frequency while communicating these is activated
when a SMS or call is preceded. The frequency sensing coil monitors the frequency of a
particular area and produces a command to the controller which displays the information of
the cell phone user to the operator with this help the theft or unwanted interruption can be
detected. The detection of cell phone is informed to the controller room by using RF
communication. Hence the examiner can know about the situation from his room itself.

2. BLOCK DIAGRAM
TRANSMITTER
RECIEVER