[Blogs] jwilson56's Now Playing Blog - Detecting when the receivers are on question

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I have been asked this a couple times through PM so I figured I would answer it here for others to see also.

"I have a question if you don't mind about how you were able to tell if your stereo receivers are turned on. Would it be possible to find out how you used the Ocelot to do that?

Thanks for any help you could provide....

Jim"

There are two ways you can do this. First is by using a Current Switch that you use with one leg of the power cord that switches a relay on and off. I use this method for one of my receivers. I use this for my dryer status also. They are very handy devices that can be found on Ebay for a decent price now and then.

Typical one : http://www.mod-tronic.com/mod_pdf/veris/h708_908_d.pdf

Second (which is the way I chose for most of my receivers) is to use the 'switched' AC power outlet on them. I purchased some cheap low voltage (under 5) wall wart type power supplies from a surplus company cheap. I then wired these into the Ocelot SECU16i and used the analog input to detect for an on and off condition. I also went through some optical couplers but if you make sure the on voltage is not over 5 volts then you can hook them directly to the Ocelot's inputs.

You can see more details on my Ocelot interface in the showcase. I need to draw up the schematic diagram for it someday as well.


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