First, define what you mean by "motion detector." A device to detect motion can be as simple as a string...or as complicated as an international network of gigawatt radars and supercomputers. If you refer to yard lights that are activated by "motion" in front of their…
Read the full replyHi,
Two questions about motion detectors.
2) Are there motion detectors sensitive enough to detect the motion of a common house fly ?
Can you provide any sites that discuss such devices ?
Thank, Jim
First, define what you mean by "motion detector." A device to detect motion can be as simple as a string...or as complicated as an international network of gigawatt radars and supercomputers.
If you refer to yard lights that are activated by "motion" in front of their detectors: These are called PIR (passive infra red). The sensors inside (disassemble one!) are often a single IC in a transparent package with an integrated lens, sensor, and processing circuitry. Given the right power and a few resistors and caps to set levels and times, it will drive a small relay directly.
Detect a fly? Probably, if it is close enough. Easy enough to test. webpa
Yeah, at 3" a normal PIR minus the lens will work . :) With a beam stopper of course .
-A
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