DTMF Dowbt...

[mytech]

Is there any IC which has FM transmitter inbuild on the same IC itself?..
Thanks..

 

[blueroomelectronics]

Try looking at the keeloq system from Microchip. Have you used a microcontroller before?

 

[mytech]

Thanks for reply, And Not yet using pic, if possible i vl do...
Is there any market IC has that function?..

 

[Nigel Goodwin]

DTMF is 1970's (or earlier?) technology, it hasn't been used for years now in anything new - no one is going to make an IC that's long obselete and no one wants.

Remote controls have been digital for decades.

 

[blueroomelectronics]

A PIC is a market IC.
Any microcontrollerless wireless security system would be fairly easy to crack.

 

[mytech]

Thanks really nice link, but the problem is.. i hav very short time to finish my proj. thats why...

 

[blueroomelectronics]

Well good luck, perhaps you should have chosen a project you understand.

 

[mytech]

Oh really, wat r the ways to crack?...
So that i can built the circuit stronger..

 

[blueroomelectronics]

A microcontroller, a Keeloq one would be a good bet. It's what they use in the automotive industry, my car has a Keeloq PIC in the key.
Like I said, if its for your final University project then pick a subject you know if you want any chance of finishing it on time.
DTMF is for telephones and 1970 security systems.

 

[mytech]

Actually not for telephone dialing.. say
To control 10 doors using 4 digit passwords(wireless) i decided via dtmf to open and close... if you hav any other idea let me know..

 

[Nigel Goodwin]

Actually not for telephone dialing.. say
To control 10 doors using 4 digit passwords(wireless) i decided via dtmf to open and close... if you hav any other idea let me know..

Like we've said all along, that's 1970's technology - digital took over years ago, you should use Keeloq like Bill suggested.

 

[mytech]

Oh thanks.. but where can i find some sample circuits...

 

[mytech]

[To control 10 doors using 4 digit passwords(wireless) i decided via dtmf to open and close...]

Any sample circuits...

 

[blueroomelectronics]

When's it due?

 

[mytech]

Before feb. end...
Also i'm new to pic..

 

[blueroomelectronics]

Before feb. end...
Also i'm new to pic..

What microcontroller do you have experience with? What sort of circuits have you built in the past?

 

[mytech]

Sorry not yet built any circuit using microcontroller..
I am on it.. right now started studying it.. thats why i asked available ICs..
Can you tell me little more about keeloq.. thanks

 

[blueroomelectronics]

Two months to design and submit your design, with no prior microcontroller experience. No real idea either, you're still in the planning / concept stage.
Did you read the Keeloq documents on Microchips site, or try google "keeloq"?
We don't know where you're located, can you readily buy components?

 

[mytech]

Thanks for you kind reply,
Actually we already planned everything..
And i have experienced with some ICs but not with pic..
Like i have done lots of mini projects..

This time for DTMF i thought of using KT8870 and UM91214B..
I asked any other better ICs for this application...
I know pic is a perfect solution, but i hav little afraid bec. i hav to submit within 2 months.. And For me not necessary to complete project using pic... Due to these reasons only i asked available ICs..

 

[Papabravo]

Are you saying that you actually have a source for those obsolete chips?