I have now got it running, I ended up buying a sensor from erik (on this 
list).  I did not notice any "holes" in my disc so I just monitor the disc 
edge.  seems to work great and positioning was not a problem.

thanks again to owfs list

rob
Australia


----- Original Message ----- 
From: "Nicolas Huillard" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, January 09, 2008 8:13 PM
Subject: Re: [Owfs-developers] Any ideas on how to montior DISC khw meters


Matthias Urlichs a écrit :
> I need to do the same for my own energy meter, except that mine has a
> nice red LED that blinks once per Wh. (*Way* too fast for my taste...)

That's what I did on my meter, but:
* finding a phototransistor sensible to red light is not that easy (most
are sensible to infrared)
* I added a red diode to report the blinks from the watched diode
* I didn't design the sensitivity circuit carefully, and finally had to
cover the whole meter in a black box, because even with electric lights
on, the ambient light level was so high that the red blink was not
noticed (repeater diode always on)

-- 
NH

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