Check out Microchip application note AN236 : "X-10R Home Automation =
Using
the PIC16F877A"

I have a copy if you can't find it on the microchip website.

Cheers,

Dave Challis

-----Original Message-----
From: pic microcontroller discussion list =
[mailto:PICLIST@MITVMA.MIT.EDU] On
Behalf Of Ishaan Dalal
Sent: Thursday, January 15, 2004 7:07 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE:] interfacing to and powering logic from AC power line/X10


I'm trying to build a PIC based X10 transmitter, at this point basically =
an
IR make/break based "toggler" for a light. I know that there are modules
that will do the AC interfacing for you, and all you do is send serial =
data,
but I'd like to build this.

It's maddeningly impossible to find a schematic, and from what I =
understand,
you use a transformer tuned with a proper cap that rejects 60 Hz on the =
AC
end, and connect your 120 KHz oscillator to one end of the other side of =
the
transformer.

Does anybody know of a datasheet, etc., that provides a coherent =
explanation
of interfacing low-voltage DC to the power line? Something X10 specific
would be icing on the cake.

Also, what would be the best option to power the IR LED/receiver and PIC
*without* using a transformer from AC?

Cheers,
Ishaan

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