enrico,
I have made a software
that could play a *.wav file (a 1 minute song) in my PC at the time
when trouble occurs. I wish I could make a hardware (connect from PC
speaker to a phone) that able to call my home phone number at that
time.
Why not create software that dials your home phone, then all you have need is
hardware that switches the phone to hands free mode.
The concept is: while my PC speaker plays a song, the signal
will generate the hardware to switch the phone's handsfree on.
The problem with that is that the speaker creates various sounds so the
hardware would have to distinguish among them. If the computer dials the
phone the dialing program could also send a signal to a port, you might need
a second parallel port to make things simplest. The program would output to
that port, say 'FF' and the hardware then would only need to sense a 1 at one
of the port bits. At the end of the song the software would clear the bits at
that port.
What kind of hardware requirements would the phone require to put it into
hands free mode?
Jim
