Well I am Working on a PIR occupancy sensor project and the issue is, it is having false detection on occasions like when an air conditioner or a fan is turned on, well I can't figure what to do?
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\$\begingroup\$ Does the false detection also happen if the sensor is made blind, e.g. inside an enclosure? If yes, there is an EMI problem. \$\endgroup\$– JensCommented Apr 4 at 15:18
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As there is no physical difference between the heat from a human body and the heat from the heating system (they both emit electromagnetic waves at the same wavelength), PIR sensors cannot distinguish the two. There is one difference, though: a human moves about the room. Therefore, what you need to do is prevent the heat from the heating system from moving around the room. Or, better yet, switch to a different motion detector, such as ultrasound or microwave.
answered Apr 4 at 12:51
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\$\begingroup\$ The problem is that the sensor is creating noise every time when a ceiling fan or AC is turned on. And it is very difficult to differentiate between the signal caused by human detection and the signal caused by these external factors. \$\endgroup\$ Commented Apr 6 at 4:54