Matrix Frequencies

[Mridul Agarwal]

I have got a 4*4 matrix keypad and I have a confusion that it will produce DTMF frequencies or not.

Can someone help me out in telling that will it produce DTMF frequencies or not?

For convenience I have attached my keypad’s photo:-

 

Front View

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Back View

Side View

[Mridul Agarwal]

You mean to say a DTMF decoder

[AJISH ALFRED]

Hi Mridul,

You need a DTMF encoder IC to be connected with the keypad to produce DTMF frequencies. You can use a DTMF decoder IC to decode the same.

[Mridul Agarwal]

So sir any DTMF encoder you can tell.

[AJISH ALFRED]

Suggest you to use UM91214 as DTMF encoder and MT8870 as DTMF decoder.

[Author]

Posts