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Electrical Fan
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Posts: 438
Joined: Aug 2009
14-12-2009, 07:15 PM

describes the brief operation of a authenticated and multiple coded microcontroller based wireless security system. A system which uses a simple RF without any encoding schemes for transmission can be can be hacked easily. Attackers can use custom made devices which mimic or regenerate the codes of the original device to get their attack done. The idea is to use a unique and a complicated code which will be very difficult to trace and backup. The transmitter and receiver agree on a particular code for the transmission. If that matches then only the next step of desired operation will be performed. In this method unauthorized devices cannot communicate with the receiver without knowing the codes.
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Active In SP

Posts: 291
Joined: Apr 2010
29-04-2010, 05:41 PM

This project and implimentation is designed to to make unattended automatic toll tax collecting stations at check barriers. This system is designed ,using atmel 89c51 micro controller & discrete components. There is ir transmitter and receiver modules at the heart of the system. They transmit 38khz strong ir beam, has a range of more than 15 feet. This is just a simple a simple implementation of the toll collection process automatically in a model form. Much more efforts and research has to be put in to make it a commercially viable project and implimentation.

when light vehicle is detected, one rupee sensor led will glow also the device will speak out " please enter one rupee" in three languages. gate will open when the coin is inserted and when the vehicle crosses other side of the gate the gate will close and the count value on the lcd display will be updated. A higher amount will be asked for heavier vehicles.

for more details, visit this link:

This company has implemented the project and implimentation:
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