...
Figure 3 AMN31111 sensor
Figure 4 Electrical characteristic from AMN31111 datasheet
Figure 5. AMN31111 sensor digital and analog block diagram
Interface electronic circuits
AMN3111 is has singe-chip IC with built-in amplifier and comparator.
It detects variations in infrared rays. However, it may not detect in the following case: lack of movement, no temperature change in the heat source
Signal can converted to digital by external A/D converter. It also can be connected directly to microcomputer. Signal may not be need to convert to digital if digital version of the sensor is chosen.
It's calibrated to detect differences in the temperature between the background and the object, movement speed and the object(human body).
Some noise is detected in the sensor, typical noise value being 155 m Vp-p to maximum of 300 m Vp-p. A noise filter is recomemded for applications requiring enhanced detection reliability and noise withstanding capability.
Group members:
Mohammad Shahidul Islam, Riku Sorsa
...
http://www.ehow.com/how-does_4596955_motion-sensor-work.html
http://illumin.usc.edu/assets/media/160/1000pxSonar_Principle_EN.svg.png
http://images.machinedesign.com/images/archive/72829sensorsens_00000051108.jpg
http://www3.panasonic.biz/ac/e/control/sensor/thumbnail/amn31111.gif
http://www.panasonic-electric-works.com/cps/rde/xbcr/eu/ds_61804_en_pir_motion_sensor.pdf
