Eltec 442-3 Near-infrared Pyroelectric detector.
Used to sense body heat or flames. Comes with
1-inch diameter Fresnel lens. Analog output pin
provides information about direction of motion
of heat source.
Extremely simple to use, this sensor requires
no external components, only power and ground
connections. The output is an analog signal
(0-5V) which can be read by any microcontroller
with a spare analog input pin.