i have provided the Tx and Rx circuit in the attachments.IT is basically the microcontroller 89C51 based Secured Wirless Communication.
This project is used to communicate or transmit a text message from one place to another place through wireless. The text message is encrypted by using the Microcontroller and the encrypted message was transmitted through wireless. At the receiver end the signal was received by the standard receiver and the analog signal was fed to the Microcontroller and it was decrypted by the Microcontroller and the message is displayed over the LCD display. We can use several receivers and the message from the transmitter can be sent to the entire receivers at the same time. Each receiver can be accessed separately by its address.The Microcontroller is used to do the above work. It gets data from the Keyboard and encrypt with a private algorithm and at the receiver end the Microcontroller decrypt it with the same algorithm and display the data over the LCD display.
(in the RX ckt the FM reciever is incorrect its AM reciever- RCR-433 RP )

IN THE CIRCUIT WHAT IS THE USE OF "SEND", "EDIT","RECIEVE" and "READ" pushbuttons ,do you have any idea ? for what purpose are they used ?

Attached Images

	ckt rx.gif (37.6 KB, 10 views)
	ckt tx.gif (36.0 KB, 9 views)

 

They are just signals read by the firmware on the uC. Without the firmware source one can only guess and one guess is a valid as the next.

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