PIC16F628 microcontroller and DTMF CM8870 integrated circuits based on the 1, 2, 4 relay has versions with PCB printed circuit drawings ares proteus software prepared by the Picbasic. Source code, the PCB according to... Electronics Projects, CM8870 Remote device control via telephone DTMF pic16f628 "microchip projects, microcontroller projects, pic16f628 projects, picbasic pro examples, " PIC16F628 microco ...

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Telephone operated remote control using PIC16F84A microcontroller

This design controls up to 8 devices using a PIC microcontroller (PIC16F84A) connected to the phone line. The unique feature here is that unlike other telephone line based remote control, this device does not need the call to be answered at the remote end so the call will not be charged. This device depends on number of rings given on the telephone line to activate/deactivate devices. 1. Circuit diagram (de ...

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Two way Simple Very Small Telephone Exchange

This is a very small telephone exchange attached only two ordinary Tele phones. Fully bi-directional facility with an intercom system. When a phone is in off hook condition , Exchange will detect it & send ringing pulse to other phone. When it will be picked up , the connection will be established between both phones. This will be taken place vice-versa. Micro Controller = PIC16F84A Firmware version = 1 ...

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