DTMF Dowbt...

[mytech]

Yes i hav both the chips.. Is there any better IC than those?..
Also i need encrypted rf transmission technique..

 

[blueroomelectronics]

Sure plenty of better ways to do it. But since you've got those ICs you might as well try to use them. Good luck.

 

[steev]

https://ashishrd.blogspot.com/2007/07/cell-phone-controlled-door-latch.html

 

[blueroomelectronics]

https://ashishrd.blogspot.com/2007/07/cell-phone-controlled-door-latch.html

Didn't know it was so cheap to leave a cell phone connected to your door.
So anyone who knows the phone number could open the door?

 

[steev]

well i planned to use it for some device control etc.not for security stuff.

i build it yesterday,but it dosen't worked.don't know why.
that circuit he got is meant for another chip.
**broken link removed**
but he used CM8870 instead.is it ok?
shld i do some changes in the circuit?

 

[kingssk]

i am studying BE(EEE) i like to study embedded system which is the best center at coimbatore?send to email-ssk.saravanan08@gmail.com