detect power loss

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i have looked @ openenergyproject site's info measuring voltage , current (and it's stuff).  want simple, boolean/digital input indicating whether there line voltage present or not.

i'll have 240v, split-phase wiring (2 * 120v ac , ground) measure.  interested in using 1 of 2 120v lines (i can safely assume if 1 line dead, other).  arduino uno's power-supply coming different source.

basically want want kind of "reverse relay", 120v available on line holds i/o 1 state , flips when voltage gone.

the openenergyproject uses ac/ac transformer , uses voltage-dropping-resistors drop range 0-5v analog i/o port can measure.  want know if it's present or not.  i'm not interested in whether it's 120v or 110v on line.

is there cheaper/simpler alternative working line-voltage (probably) digital input on arduino?

thanks,
aj


probably cheapest way detect line-voltage use mobile phone charger (usb charger) purchased ebay.


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