Offering simplified circuitry with a fully integrated Sensor design, Panasonic's EKMB Series requires consumption as low as 1micro A current, which is suitable for battery-driven wireless equipment. Most lenses are available in white, black, or pearl white. The EKMB and EKMC Series lens type options include Standard Detection, Long Distance, Wall Installation, Saturn Lens (Standard and Slight Detection), Wide Field of View, High Density/Long Distance, Slight Motion, Low Profile, Wide Area Detection, Ultra Slight Motion, and Flat Square lens types. Both the EKMB and EKMC Series offer many lens options suitable for various applications, detection distance, ceiling installation height, field of view, and detection zone requirements. Panasonic Passive Infrared or Pyroelectric PIR Motion Sensors are available in a wide variety of current consumption options and offer both digital and analog output options. These change pulses are what is detected.An Available Lens Option For Any Application! When the warm body leaves the sensing area, the reverse happens, whereby the sensor generates a negative differential change. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves. When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. The lens used here is not really doing much and so we see that the two slots can 'see' out past some distance (basically the sensitivity of the sensor). The PIR sensor itself has two slots in it, each slot is made of a special material that is sensitive to IR. To begin explaining how a basic sensor works, we'll use this rather nice diagram PIR sensors are more complicated than many of the other sensors explained in these tutorials (like photocells, FSRs and tilt switches) because there are multiple variables that affect the sensors input and output. A great page on PIR sensors from GLOLAB \\.Parallax Datasheet on their version of the sensor.RE200B datasheet(most likely the PIR sensing element used).BIS0001 Datasheet(the decoder chip used).Power supply: 5V-12V input voltage for most modules (they have a 3.3V regulator), but 5V is ideal in case the regulator has different specs.Sensitivity range: up to 20 feet (6 meters) 110° x 70° detection range.Pulse lengths are determined by resistors and capacitors on the PCB and differ from sensor to sensor. Output: Digital pulse high (3V) when triggered (motion detected) digital low when idle (no motion detected).If there's a datasheet, you'll want to refer to it Nearly all PIRs will have slightly different specifications, although they all pretty much work the same. These stats are for the PIR sensor in the Adafruit shop which is very much like the Parallax one.
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