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Hi Luis and PICERs,

Consider using Hall Effect Sensors. Although a bit more expensive, but at a
later stage you could measure the level of activity also, including on/off.

I attach this document for your perusal.

Regards
Aurangzeb Haque

----------
> From: Luis Fernandez <radiobit@DRAGONET.ES>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Detecting AC power line on/off
> Date: Thursday, April 23, 1998 9:00 PM
> 
> Hi list,
> 
> Would like to know your opinion in how to detect activity (power on) of
> devices connected to mains power supply (220V 50Hz here) in order to
provide
> a clear input into a PIC I/O pin.
> 
> Goals are: Isolation from power line, Reliability, Low cost and low size
> 
> Relays with 240V AC coil are usually big because they are made to switch
> heavy loads, so expensive and the coil can fail. The samallest I could
find
> was a 24V AC relay + resistor, but still not very reliable.
> 
> What about using a neon lamp and some kind of optical detector
> (fototransistor) and may be an RC network to integrate the pulsing light
of
> the neon. What kind of optodetector can be used with this arrangement ?.
> Any other idea ?
> 
> 
> 
> 
> Luis Fernandez Cormenzana
> RadioBit Sistemas, S.L.
>     Sistemas de control de rondas
>                          Patrol presence controllers
>     Control de patrullas y veh’culos
>                          Patrol vehicle fleet control
> http://www.dragonet.es/users/radiobit
> Tel/Fax: +34-96-5856457
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