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DTMF interface for decoder

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ewandeur

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Hi,

I'm looking for a schematic for interfacing telephone line to a DTMF decoder (HT9172 Holtek), in order to build a remote control activated by phone.

Tkx.
 

Please take a look at attached schematic.
It build with AT89C2051 microcontroller and MT8870 DTMF Encoder/Decoder chip
 
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    ewandeur

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    brm

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hi budhy,

have you written code in C?? if yes, pl post here.
 

hi.May i know what kind of relay it need to be used in that circuit?Is it that any type of relay will do?i'm doing a project almost the same as this.i have my own circuit.but from that circuit,what i know is i need to use a 5V dry reed relay.In a circuit,is it that any relay which serves the 5V can be used?
 

Would you please post the source code?
 

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