Since so many people can't seem to unzip these files, here they are. Rename santral.HEX.txt to santral.HEX
I uploaded it this way because a *.HEX cannot be uploaded even though it is a text file anyway. Don't ask me about this project as it belongs to Wasp, who hasn't been here for a long time.
Device is too complex for only one subscriber and Phone Switch Board.
Yes one phone is subscriber and another is Switch Board.
When subscriber pick up phone, buzzer start ringing and when Phone switch board pick up phone , buzzer stop buzz and conversation can start. End conversation when any part in this situation hang phone.
For me and such limited functionality this is too much complex unnecessary
circuit. (Why use PIC it is possible solve in both way only much more simple).
ATX sarı uç: AT computers power supply yellow wire (+12V)
ATX siyah uç: AT computers power supply black wire (GND)
ATX kırmızı uç: AT computers power supply red wire (+5V)
THIS CIRCUIT AND ITS FIRMWARE IS MY OWN PROJECT AND IT CAN BE FREELY CONTRIBUTE UNDER GNU LICENCE.