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Please play nicely.  No one wants to listen/read a keyboard warriors rants....

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Author Topic: That moment......  (Read 2972 times)

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Gaffers

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That moment......
« on: 05 January 2015, 15:45:01 »
....when a fault has been bugging you for a while and you could not understand it.  Then you have a eureka moment while you calm down and realise how silly and obvious it was..... :-[

I installed a little PIR sensor for the light on the porch.  Fitted a 4th line so that I can over ride it with a switch.  All very simple and tested in twilight all ok.

Then it was constantly on every night regardless of the settings I tried.  During the day it functionned as it should (ie stay off) Convinced I had a duff PIR I was about to send it back for a replacement until I had a theory which I tested and proved correct.  So simple I nearly smacked my head against a wall.

What do you think was wrong?  Just for the record, the PIR and settings were completely fine.  Let's see how clever you are ;D
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Auto Addict

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Re: That moment......
« Reply #1 on: 05 January 2015, 16:32:34 »
It's that obvious, it's not worth mentioning ::)
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05omegav6

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Re: That moment......
« Reply #2 on: 05 January 2015, 16:34:00 »
Switch was on the wrong side of the sensor... :-\
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Terbs

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Re: That moment......
« Reply #3 on: 05 January 2015, 16:37:09 »
I've read it, and re read it. turned it over in my head a dozen times. I am having to give up.........I don't know what a PIR is  ???
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Wrong Switch Tony......flicking the wrong bit for 50 years

Webby the Bear

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Re: That moment......
« Reply #4 on: 05 January 2015, 16:49:19 »
Need to remove the cellophane from the sensor  ;D

Thats also just a guess cos ive no idea what a PIR sensor is either  ;D
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RIP Paul Lovejoy

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Re: That moment......
« Reply #5 on: 05 January 2015, 17:00:15 »
PIR = Passive InfraRed sensor (although that might give it away ::))

The type that knows if you walk in front of it. :y
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Re: That moment......
« Reply #6 on: 05 January 2015, 17:00:26 »
Passive infrared sensor.

Beat me to it! ;D
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Gaffers

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Re: That moment......
« Reply #7 on: 05 January 2015, 17:00:57 »
Quote from: Taxi Al on 05 January 2015, 16:34:00
Switch was on the wrong side of the sensor... :-\

Nope, wiring at the switch was fine as was the wiring at the PIR and the light.
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Re: That moment......
« Reply #8 on: 05 January 2015, 17:01:40 »
Quote from: Monsieur Guffer on 05 January 2015, 17:00:57
Quote from: Taxi Al on 05 January 2015, 16:34:00
Switch was on the wrong side of the sensor... :-\

Nope, wiring at the switch was fine as was the wiring at the PIR and the light.

Still obvious ::)
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Gaffers

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Re: That moment......
« Reply #9 on: 05 January 2015, 17:11:21 »
Quote from: Auto Addict on 05 January 2015, 17:01:40
Quote from: Monsieur Guffer on 05 January 2015, 17:00:57
Quote from: Taxi Al on 05 January 2015, 16:34:00
Switch was on the wrong side of the sensor... :-\

Nope, wiring at the switch was fine as was the wiring at the PIR and the light.

Still obvious ::)

Clearly not ;D
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TheBoy

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Re: That moment......
« Reply #10 on: 05 January 2015, 17:16:56 »
The light (or a.n.other heat source) pointing towards it
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05omegav6

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Re: That moment......
« Reply #11 on: 05 January 2015, 17:56:37 »
Either next to porch light or boiler exhaust...
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TheBoy

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Re: That moment......
« Reply #12 on: 05 January 2015, 18:18:55 »
Quote from: Monsieur Guffer on 05 January 2015, 15:45:01
I installed a little PIR sensor for the light on the porch.  Fitted a 4th line so that I can over ride it with a switch.  All very simple and tested in twilight all ok.

I thought virtually all PIRs had an override by turning on-off-on in quick succession
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plym ian

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Re: That moment......
« Reply #13 on: 05 January 2015, 20:52:52 »
The pir wasnt connected to the light  ::) ::)
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Entwood

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Re: That moment......
« Reply #14 on: 05 January 2015, 20:58:00 »
Plants, trees or bushes moving within the line-of-sight ??
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