PIR Sensor Trouble

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i bought pir sensor (http://www.sparkfun.com/products/8630) intention of making little arduino burglar alarm.
for whatever reason wouldn't work went lecturer , between 2 of us, got work using analog pin instead of digital , having battery connected usb.

when reassembled when got home won't work again. know i'm close, missing resistor or that, can't life of me figure out.

picture of wiring: http://imgur.com/xqzlx

the 3 wires on right left there earlier attempt.

can post schematic? pictures hard see have done.

quote
and having battery connected usb.

you should not have this, sensor work off 5v.


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