DTMF use Microphone as a tone receiver

[ikram1991]

Hello guys

Actually I want make automation system using DTMF ( Dual tone multi frequency). there is any possibility microphone can be use as input to send signal tone to DTMF decoder?

Thanks.

 

[(*steve*)]

I can't see why not.

 

[Harald Kapp]

The DTMF decoder doesn't care where the signal comes from as long as it has a sufficient amplitude and good signal to noise ratio. A microphone can be used, you will need a pre-amplifier to boost the microphone's weak signal to a level that is suitable for the decoder.

Note that when you pick up a DTMF signal with a microphone you will pick up noise, to (e.g. environmental sounds). Depending on the level of the noise it may be hard to reliably decode teh DTMF signal.

 

[ikram1991]

Steve :
Thank you Steve! Actually I feel doubt when saw many video in youtube they use handphone directly connect to the control board.

Harald:
Thank you Harald!
The project maybe just use in bedroom. Not to noise. But there any suggestion to counter noise problem?

 

[(*steve*)]

But there any suggestion to counter noise problem?

The best way is to ensure that the DTMF tones are louder than the background noise (preferably significantly louder) and that your DTMF circuit is good at rejecting noise.

 

[ikram1991]

Take noted.
Thank you steve.