I'm after someone to build, or at the very least draw up a set of build instructions and code that I can then follow and replicate, for an outdoor all year round sensor.
Message me for further details.
A sensor for ... what?
Message me.
Why not simply tell everyone, and they can decide without wasting any further time?
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Wonder how long the term of this particular NDA is going to be...
For outdoors, of course.
So, something that detects a ceiling / no ceiling.
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No, no,no. It's an elephant detector.
Obviously it's elephants 
that don't fit indoors. Could be buffalo or giraffe rhinos are too rare to need a sensor.
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Outdoors are the ones with "EXIT" signs hung over them.
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Unless you're wearing a raspberry beret.
The kind you find in a secondhand store.
I had to research that one!
That's when I saw her, ooh, I saw her
She walked in through the out door, out door
A round sensor is not an easy thing to find as most PCB ar
He rectangular. It is possible I read it wrong and maybe you are trying to detect round objects then I recommend you use a more powerful system than Arduino as image/video processing is beyond what most Arduinos can handle.
Hope this helps,
wade
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Yes, but is there is a requirement for the sensor to actually 'work'
Most sensors can be made round by using a belt sander.
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3D printed enclosure and cable for DHT-11 or DHT-22 sensor for temp/humidity.
BME-280 mounts with single #4 screw and adds baro.
Weather logger project
But it's not round.
And how would you tell if you're outdoors or not just based on a DHT11 or DHT22? That'll at least require a real good machine learning algorithm.
Is that housing and wiring suited for a sensor that is outside the doors of a low earth orbiting satellite ?