Hi all,
I'm new to this kind of stuff. Could you please help me with this?
I'm trying to establish the signaling connection between 2 simple phones which connect to my PIC18F4550.
First, if the phone is OFF hook or ON hook, what does the PIC read from the portA0 (i.e. assume that the phone will have 9V power supply already) so that when the other end phone will hear a busy tone when it wants to reach me?
Second, when I press a number to call the other end phone, how does the PIC understand these numbers?
If someone has experience on this, please give me some help. I'm really appreciate it. Thank you all!
Tom
I'm new to this kind of stuff. Could you please help me with this?
I'm trying to establish the signaling connection between 2 simple phones which connect to my PIC18F4550.
First, if the phone is OFF hook or ON hook, what does the PIC read from the portA0 (i.e. assume that the phone will have 9V power supply already) so that when the other end phone will hear a busy tone when it wants to reach me?
Second, when I press a number to call the other end phone, how does the PIC understand these numbers?
If someone has experience on this, please give me some help. I'm really appreciate it. Thank you all!
Tom
