Dtmf tones tranmitted via RF

[hassanaftab90]

Hi guyz!

I am making a semester project which includes digital transmition. I have decided to use 8051+mt8880+ RF transceiver!

but i need to know how these DTMF tones can be tranmitted over RF...??
Help plz!

 

[nandhu015]

You can use any dtmf encoder with RF transmitter to transmitt the dtmf.

Nandhu

 

[pranam77]

Just connect the output of the DTMF encoder to modulate the FM transmitter and its done...Thaz all.

 

[hassanaftab90]

thanks guyz for ur help!
can u also provide me with the assebly code of how to use MT8880 as a generator and receiver of DTMf with diagram?
I am very confused with the pin connections!

 

[pranam77]

thanks guyz for ur help! can u also provide me with the assebly code of how to use MT8880 as a generator and receiver of DTMf with diagram?!

Guess there is nothing like assembly code for MT8880 as it is not a microcontroller. If you are refering to the tome generation table, you'll find it in the device datasheet.

I am very confused with the pin connections!

Every detail of the pins are explained in the datasheet. Have a look. There is nothing complicated to get confused...Cheers

 

[sahu]

thanks guyz for ur help!
can u also provide me with the assebly code of how to use MT8880 as a generator and receiver of DTMf with diagram?
I am very confused with the pin connections!

why MT8880 ?
u can use UM94521B for coder & CM 8870 for decoder.it easy avilabal on google.