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Circuit works fine with landline but not a cell phone

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nipun

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need help

i soldered a circuit for dtmf to bcd convertor using CM8870.it works fine with landline telephone.i want to use it with a cellphone.it isnt working with cellphone.i cut the wire to speaker of handsfree of a mobile and connected to the input of ic.still its not working.i intend to use it as a remote control by calling the mobile with another mobile.plz help ,its urgent.
 

e_eja

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Re: need help

dear,
your cellphone should able to produnye DTMF signal caose otherwise it wont't work.
and signal from cellphone should connect to input of MT8870
regards
 

sam_manchali

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Re: need help

hi nipun,

Like e_eja said, I think u should enable the TONE mode for the keypad in the "PHONE settings" for ur mobile, and also set it to 'LONG' tone mode.

I think it should work, we regularly use it for reaching the help desk for automated service for our service providers, they use the same thing.. -:)
This should do it i guess..

Regards
Sam
 

nipun

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Re: need help

today i tried again.but this time i called from another cell,then i received the call,then asked the caller to press any key .it worked perfectly fine.i dont wha twas the problem.at first i used to press the key of the same cell with keypad tone activated.well anyway it worked out fine.
 

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