Tuesday, November 11, 2008

Call Filter

I often woke up early, around eight AM in the morning. I have a phone in my bedroom, but the calls in the morning never seem to be for me. So to make an end to these wake up calls I programmed a PIC16F628A and combined it with a DTMF decoder to give me my rest during Sunday and Saturday mornings. The telephone number of the person calling is read and compared with a couple of telephone numbers stored in the PIC, does the number equal one of the stored numbers than the name of the person calling is displayed on the LCD Display, and the phone will ring. If the number does not match one of the known numbers then my phone will not ring as it will be disconnected using a relay.

Movie of the Call Filter in action:

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