Hello, I have attached a Parallax PIR detector to digital pin 8 of an Arduino Uno. My simple program looks for the PIR signal and plays some wav files. The detector turns off even when my hand is 6 inches in front of it. Even if I wave my hand it turns off but not as soon. The documentation says for Rev A, "Jumper selects single or continuous trigger output mode" but there is only one jumper and I tried both settings. I believe Rev B jumper sets distance but I am confused. Please help me understand why the detector doesn't stay on. Thank you!