Lighting Sensors Not Working

[Alexam]

Went to Maplin today and asked for a garage internal light with sensor that would switch on when doors opened. The salesman sold me a Energiser PIR Sensor Floodlight, 30 watt 90 Lumens, which he said should be good. Took it home and fitted it with the sensor facing the u/o door and light pointed opposite to light the garage. For some reason the sensor will not trigger when the door is opening, which is what I want it for, so that we don't have to get out and switch on a light.
Have I been sold the wrong thing, or are there different types of sensors that will recognise a garage door. Ir will trigger my movement and perhaps it's a 'warm' pickup as against cold? Any help would be appreciated.

 

[Octopus]

Was it dark when you tested it?

30W light will be very bright!

 

[Andy-1960]

Yes, you have been sold the wrong thing, the sensor is looking for a moving heat source such as a human being, but will not detect the cold moving garage door.

 

[Toneyz]

Have you got the sensor in night time mode?

 

[uksrevivor]

He has been sold a PIR spotlight which will only work on detecting a heat source from us humans and as mentioned will not operate with a garage door.

 

[Octopus]

Lots of pir sensors are set off by moving plants and trees

 

[Alexam]

Thanks for replies. So what sensor light should I buy?.
I went to the shop for help but it seems I have not been sold the right thing.

 

[Toneyz]

How do you want it to do.whats the aim would be a starting point.

 

[uksrevivor]

I might be wrong here but i think you can use a tilt sensor for the garage door so when the door opens the tilt sensor will activate and will power up the light in the garage but the light will be one that has no PIR sensor and will be powered from the tilt sensor.

 

[Martyn Fletcher]

The PIR in my bathroom works even when my missus walks in there and there's no body heat in her at all.
Seriously though, the sensor (dependant on the settings you left it on) should work with any movement. There should be a sensitivity dial or time/delay dial and a day/night time dial. If the pir is still not tripping when you set the max settings in either extreme, then I would suggest that it may be faulty.

 

[Alexam]

So, please, is there another light with the correct type of sensor that will switch on ANY movement?

 

[uksrevivor]

As Martyn has posted above try adjusting the PIR sensor to see if that works first set it to maximum and depending on where the light is situated you may need to adjust the angle of the PIR.

 

[Andy-1960]

How a PIR sensor works... When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves

 

[uksrevivor]

Ok so I have just tried this out by waving a lump of wood in front of my neighbours PIR light in the garden attached to his shed while hiding alongside the shed the light did not come on but my neighbour came out thinking i was trying to smash his light lol a bit of explaining to him and he has now gone indoors laughing his n*ts off thinking im mad but the light did not activate until i waved my hand in front of it so im guessing it wont detect a garage door opening either.

 

[Toneyz]

Maybe some sort of door switch.