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This PIR sensor is too sensitive - it keeps turning on even when there's nobody about. A few resistors added to the circuit have reduced the sensitivity.
This PIR sensor is too sensitive - it keeps turning on even when there's nobody about. A few resistors added to the circuit have reduced the sensitivity.
With respect. Wouldn`t it have been a lot easier just to buy a pir with a sensitivity control ?? they`re about £8. 🙂
You said the pin numbers were wrong, but you still put the res between 1 & 3. Or did I get that wrong?
I was watching calm and interested and then a spider walks across the board. As an arachnophobic dude I can't fathom how one couldn't even notice it. I'm scared, can't watch further!
what is the sensitivity of this sensor??? minimum and maximum…
…a thin coat of white candle wax on lens…
This is the wrong PIR for the application. You need a 180 or 120 degree beam rather than the omni sensor you are using.
Leave it out for a couple more weeks in the British weather, it'll quiet down alright. Permanently.
I'm going to reverse engineer the "mask the lens comments"…! lol At the historic railway station that I volunteer at there is an alarm PIR module wired as door announcer that I installed a couple of years ago. It is connected to a nasty shrill beeper that everyone complains about. Although I must admit I do enjoy the way it startles the uninitiated. 😉
It was way too sensitive so I reduced the sensitivity by masking it off with a piece of card. But now having seen this I might do away with that and look at gain reduction. It's a fairly old PIR so it might use a different chip, but I assume it would be a similar circuit.
Wish I had that problem… can't get out PIR to turn on the light until you are tripping trying to find the sidewalk.
For some strange reason, with that title I felt there should have been a wooden mallet in your thumbnail.
Put a shield up so the lights don't set it off.
Job very well done! I liked that!
lol I was thinking of a bit of translucent plastic over the lens
I get the impression the data sheet values in the amplifier chain were arrived at by random fiddling – the upper amp has less than a third the passband of the first for a start. I always used two identical stages.
The lens is an integral part of the detector so testing without it is unlikely to yield reliable results. As such, it's possible to reduce the coverage of the detector by putting electrical tape on the lens (either inside or out) to reduce unwanted trigger events.
looks nice now but check that black sharpie in a week or two – TBH I think it'll degrade quite quickly under the sun, even the weak british sun in november.