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caller id project

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callerid

New Member
dear all
i currently doing the caller id with the pic 16f628A. my programming and ic are working very well but my mt8870 decoder is not working. i need some help here. i stay in Malaysia please help if anyone got any idea
this is the schematic i refer to. thks. i need it urgently.

 

JimB

Super Moderator
Most Helpful Member
There are several different standards used for caller ID.
The circuit which you have built uses a DTMF receiver (MT8870), If the Malaysian phone system does not use DTMF for caller ID, your circuit will not work.

Have a look here:
Caller ID FAQ
Look as though there is a good description of whats-what.
I notice that it mentions Singapore, but I did not see Malaysia in there.

JimB
 

callerid

New Member
my country malaysia is using the dtmf system. that is why i build that circuit. do you got any idea to check either the dtmf decoder is working properly? is that all the country use the same dtmf format?

thk for the reply
 

mramos1

Active Member
The program you uploaded is not complete. Hard to help with what you uploaded, I do not see the scan routine.
 

callerid

New Member
i have tested the dtml with the schematic below and it work well. i just dunno why i connect the Q1 to Q4 pin to the pic abut the lcd didnt show any number. please help. thks
 
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