A highly compact PIR sensor housed in a TO5 package fitted with a zoned fresnel lens. The sensor detects infra-red radiation in the low infrared spectrum (10µm wavelength) which is emitted by human movement.
The sensors are able to detect a change in temperature from object to ambient from as little as 3°C. Changes in the level of detected emission are evaluated by a window comparator and if the change exceeds the upper or lower threshold the output level of the sensor goes high and can be used to trigger external circuitry.
Wednesday, January 30, 2013 Question by: Kev F
| Product code: 61-1504
Q. Can this be used to replace a low voltage switch in a electronics project - so to switch on a backlight on a clock (for example) instead of pressing a button?
A. Hi Kev. Thank you for your question. You may be able to modify assuming that you have the correct connection voltage and room, these only send a pulse signal when movement is detected I would suspect it will not be a case of just exchange for the original switch as requires a circuit to operate the PIR sensor (see data sheet).