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 Post subject: New AIR build
PostPosted: Sun Feb 11, 2018 5:27 pm 
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I have the build bug and have been experimenting with a variety of new (to me) sensors lately. The AIR (active infrared) style sensors have my attention at the moment because I am interested in creating more of a trip-wire style sensor, and the heat down here causes the passive infrared units to false trigger like crazy.

The first version I built was based on Stinky's instructable. It works well, but is battery hungry, so I added a PIR sensor to turn the AIR on and off when critters approach. That unit is deployed now, so we'll see if it works. In theory it will.

Meanwhile, I put this unit together. This AIR module fires off a reflector. It is rated for 10-30V, but I hooked it to 4AA Eneloops (5V) and it works fine. It only draws .90 mA. The unit has 3 wires- DC +, - , and OUT. When the beam is interrupted the unit sends a high signal through the OUT wire.

Here's a link to the unit: http://a.co/c3Hxse0

Coupled with an Arduino Pro Mini and a Oppilas wireless transmitter to trigger the camera shutter it draws just under 7 mA. This one is mounted in a basic project box with Ram mount for prototyping, but I plan to put it in a sturdy Nema BUD box.

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 Post subject: Re: New AIR build
PostPosted: Sun Feb 11, 2018 8:33 pm 
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Awesome job. I cannot wait to see the results. The building bug is dangerous, I'm already looking for other active sensors using open source hardware.


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 Post subject: Re: New AIR build
PostPosted: Sun Feb 11, 2018 9:05 pm 
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Great work as usual Casey...!

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 Post subject: Re: New AIR build
PostPosted: Mon Feb 12, 2018 8:30 am 
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Fledgling
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Great work Gartooth .. Thanks for sharing .. just ordered the sensor .. lets see how it goes :)

AIR + the PIR combo looks perfect


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 Post subject: Re: New AIR build
PostPosted: Mon Feb 12, 2018 8:43 am 
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Thanks! I am looking forward to getting this out in the field for testing. My family is getting real tired of having their photo auto-captured every time they walk through the garage. :-)

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 Post subject: Re: New AIR build
PostPosted: Mon Feb 12, 2018 6:56 pm 
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Gartooth wrote:
Thanks! I am looking forward to getting this out in the field for testing. My family is getting real tired of having their photo auto-captured every time they walk through the garage. :-)


Yeh it’s to the point in our house that our long haired chihuahua slowly peaks around each and every corner to see if he can pick out the paparazzi before they get his picture once again.


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 Post subject: Re: New AIR build
PostPosted: Tue Feb 13, 2018 12:27 am 
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Very interesting,
I am prototyping on a similar project with through beam sensors. I also got tired of the 500+ false triggers using PIR technology.

I just connected the camera metering/shutter directly to the NPN out and gnd thats it. But i have a Arduino uno and a rasberry pi at home...

At my first night out the camera hanged after a few frames due to a battery failure in the camera... otherwise this triggering system seems promising for trail type of trap. Here is a sample picture from the first night out, where the second deer triggers the camera. The focus point was boldly put just in front to f the triggering line at f5 line so the first deer is out of focus.


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 Post subject: Re: New AIR build
PostPosted: Tue Feb 13, 2018 1:16 pm 
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Hi Casey another nice build .I picked this sensor up like the one Stinky used.Extremely cheap with free shipping if your prepared to wait.https://www.ebay.co.uk/itm/New-1Pcs-Spe ... 2749.l2649

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 Post subject: Re: New AIR build
PostPosted: Thu Feb 15, 2018 9:20 am 
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Wow, great post! AIR sensors have my attention. You're all making amazing strides! Thank you very much for sharing this valuable information!


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 Post subject: Re: New AIR build
PostPosted: Mon Feb 19, 2018 1:11 pm 
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Ran a test round. Sensor worked well.

These AIR units lack the setup convenience of a PIR, but they are sure nice once you finally get them hammered into the ground and aligned. I am using concrete stakes with Ram ball-socket mounts on them.

D3200, 1/200, f11, ISO 200, 2 SB-28's w/CS triggers, Uxcell AIR reflective sensor

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