simple question (probably..)

[quintero]

i have this door opener which has a 2 wires connected to it, basically
if i connect the 2 wires together the door opens.
now i want to connect these wires in some way to the com port in my
computer, so i can control the door with some software. i know how to
set RTS and DTR, but how do i complete the ciruit and connect the 2
wires together?

 

[Bill Bowden]

quintero@walla.co.il (quintero) wrote in message news:<a12a3485.0410050609.21065a26@posting.google.com>...

i have this door opener which has a 2 wires connected to it, basically
if i connect the 2 wires together the door opens.
now i want to connect these wires in some way to the com port in my
computer, so i can control the door with some software. i know how to
set RTS and DTR, but how do i complete the ciruit and connect the 2
wires together?

You can probably use a solid state relay. The relay will
have a LED inside that controls a photo sensitive switch.
They will usually work at 10-20 mA, but I'm not sure how
much current you can get from the com port. Look around
for a SS relay that operates on low current of just a few mA.

-Bill