Weis Guy
Member level 4
any ideas on how to interface Telephone with PIC? I've been thinking of using DTMF decoder like MC145436 (DTMF Decoder)..and I will be using also coin slot for this.Anyone?!
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For this you need to monitor the telephone line and check for line reversal. Line reversal occurs when the called party picks up the phone. One more method is to monitor the line for the ring tone. If the ring tone stops, then the called party has picked up the phone.Weis Guy said:this would be my concept..i want to determine that my input on the coin slot would be accepted if the party that i would be calling picked up the call and the display will be counting on a certain time for example "0:05.00"..that concept be the same as a prepaid phone booth.