Design Caller ID using DTMF decoder MT8870


Posted on Feb 4, 2014

It`s very simple circuit using DTMF decoder MT8870 (or CM8870). As shown in the circuit, u`ll receive an interrupt ( if NAND output is connected to INT of the microcontroller) whenever u receive a call or make a call and then u can use yr program to read the digits coming out of pin 11 to 14 of the MT8870. I designed the circuit with additional features like seperating received calls, missed calls, dialled numbers along with telephone directory.


Design Caller ID using DTMF decoder MT8870
Click here to download the full size of the above Circuit.




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