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cover the PIR sensor with transparent plastic with different color (green,red, yellow, orange, white), it can reduce the range of my PIR sensor, but also make it very un-reliable. It’s also less sensitive to light changes, shadow movement, etc, But the best thing is you can position it in a place more isolated and accurate than the camera, which needs power. These battery replaceable sensors are small enough to put anywhere. But then, my PIR experience is somewhat limited. Since the PIR works on temperature differential, you might try making the room cooler- thus a warm body contrasted to the cold room would see more differential signal in the PIR. Move SWITCH for example 5 seconds. Use masking tape around the sensor for a temporary adjustment and locate the area which works for your sensitivity. With sensitivity set to 50%, the false alarm completely went away, while each detects normal human movement every time. Too sensitive PIR detectors - how to reduce sensitivity? I am convinced that the range has something to do with the focal length of the lens, PIR 'lenses' in my experience don't have a focal length: they are simply window facets angled to direct radiation from various angles on to the sensor. [example from Jablotron JA-60V], but of course I can be wrong ... Perhaps. You can find examples of how to do this on the motion trigger Tips & Tricks page here: http://littlebits.cc/tips-tricks/fridays-tips-tricks-the-motion-trigger. Fit a piece of tubing to the font of the sensor and cover all around it. Many PIR sensor modules have a potientiometer for adjusting sensitivity as well as for time on after activation. Thank you very much for proposing a new subject! Just trying to see if there’s a way to use a motion sensor where we don’t want it to go off if you blow on it. Then it will turn on only at dusk. One for LUX (light level) one for sensitivity and one for time that the light stays on. This is a pretty good idea for manufacturing: the PIR sensor and circuitry is fixed and costs a few dollars. Because it is IP20 but the electronics can be hidden in a tin. Hobby Circuits and Small Projects Problems. if your target plate is 2m away, trigger an event when the device reports any distance less than that. How can I bypass my consumer dehumidifier high limit thermal cut out. Too sensitive PIR detectors - how to reduce sensitivity. BTW anyone knows where the suggested sd5410 can be bought? http://dev1.auroralighting.com/Produkt/Innenbeleuchtung/Schrankbeleuchtung/Schrankbeleuchtung-Zubehor/Plastic-Fixed-120°-2m-range-PIR-Detector-Lighting-Control.aspx, ISO current-spike-detector for stepper limit detection, 12V to 12.6V boost with current limit for 1Amps. This could lead to over-sensitivity, and false positives. I'm wondering if the Fresnel lens can be manufactured so it would capture only tiny angle. It seems to me that the basic problem is the detector mounting height. Further to my post #4, u can also remove the freznel lens (which is what I am doing) and place the tube directly around the PIR sensor head. I’m wondering the same thing. Remember Me | New Activation | Forgot Password, This site uses cookies for content and advertising personalization, and to analyze traffic. The lenses are key- try removing the lens and see what happens- no workie any more. One way of increasing the sensitivity is by changing the value of a resistor or capacitor in one of the op-amp stages. Since the PIR works on temperature differential, you might try making the room cooler- thus a warm body contrasted to the cold room would see more differential signal in the PIR. I don’t have one. The longer the tube and the smaller the diameter, the narrower the beam. Doh! I have also tried cover the sensor with combination of different color, and/or multiple layers, same result. Simply put, the fresnel lens has some angular resolution (angular width of the beams) and at such a short distance from the ground, even a blade of grass moved by the wind a few centimeters will cause a reaction. mine picked up snowflakes and turned on and off all night when it snowed …get a spray can of clear matte and shoot one or two very light coats on the sensor …works perfect …if yo mess up you can wipe it off with acetone or paint thinner, Powered by Discourse, best viewed with JavaScript enabled. Electronics tech of 45yrs. JavaScript is disabled. Then for a permanent solution remove the tape and just paint over the area where the masking tape was placed. This could lead to over-sensitivity, and false positives. It is enough that the object (leaf, grass) will have the temperature of the surrounding air, and the soil will be warmer (warmed up during the day).

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