Re: X10 Interference from the Cellet Cellphone Charger

[nobody@xxxxxxxxxxxx (Dave Houston)]

"Jeff Volp" <JeffVolp@xxxxxxx> wrote:

>> "Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
>> news:46fec395.31012406@xxxxxxxxxxxxxxxx

>>> The X10 Good LED only checks for 9 ones and 9 zeros so something like
>>> 1110111111111000000000 or 1110000000000111111111 might cause it to light.
>
>Thinking more about the ESM1 rather than the XTB-II, I believe that uses
>envelope detection.  I guess it depends on where it samples the envelope.
>If the ESM1 ZCD is slightly skewed to one polarity, it might catch
>alternating 1's and 0's.  That doesn't explain why that green LED stayed on
>most of the time, since the start pattern needs three 1's in a row.

If you look at the screenshots at http://davehouston.net/ESM1-TEST.htm,
you'll see the ZC signal is skewed. It just uses the 12VAC signal on a PIC
pin (through a 33K current limiting resistor), relying on the PIC clamping
diodes to limit the voltage. It's really not terribly sophisticated.