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AquaticTechTank.net • View topic - DIY PAR meter

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mistergreen
 Post subject: DIY PAR meter
PostPosted: Mon Jan 21, 2013 6:49 pm 
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Joined: Fri Nov 30, 2012 1:54 pm
Posts: 279


Attachments:
PAR_diagram.jpg
PAR_diagram.jpg [ 47.29 KiB | Viewed 17791 times ]
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mistergreen
 Post subject: Re: DIY PAR meter
PostPosted: Mon Jan 21, 2013 6:52 pm 
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Joined: Fri Nov 30, 2012 1:54 pm
Posts: 279
The project started very humbly with a photodiode with a wide range that wasn't up to reading PAR.





I then found other projects out there.
http://www.colorado.edu/eeb/facultysite ... niel03.pdf
http://citeseerx.ist.psu.edu/viewdoc/do ... 1&type=pdf
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mistergreen
 Post subject: Re: DIY PAR meter
PostPosted: Mon Jan 21, 2013 6:57 pm 
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Posts: 279
I then found the VTB8441BH and thought about userbility and things went under way for building a nifty gadget.
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mistergreen
 Post subject: Re: DIY PAR meter
PostPosted: Mon Jan 21, 2013 7:01 pm 
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Joined: Fri Nov 30, 2012 1:54 pm
Posts: 279
I soon realized I needed a PAR meter to make calibrations with and can't rely on readings from other people. Light bulb, and reflector vary in output. The 27K resistance needed to be flexible too for calibration purposes. So a pot is in place of the 27K. It's easier than messing with the code with every unit.
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mistergreen
 Post subject: Re: DIY PAR meter
PostPosted: Mon Jan 21, 2013 7:06 pm 
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Posts: 279
With the help of O2Surplus, we went ahead and made the sensor more easy to produce if anybody wants one.



The final product.
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JairunCaloth
 Post subject: Re: DIY PAR meter
PostPosted: Tue Jan 22, 2013 4:21 am 
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Joined: Mon Jan 14, 2013 11:36 pm
Posts: 9
Any chance at getting the pcb file uploaded so that anyone can get the board made who wants one?
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mistergreen
 Post subject: Re: DIY PAR meter
PostPosted: Tue Jan 22, 2013 9:48 am 
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O2Surplus
 Post subject: Re: DIY PAR meter
PostPosted: Tue Jan 22, 2013 10:46 am 
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Joined: Mon Dec 10, 2012 5:46 pm
Posts: 4


Attachments:
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CLOSE ENOUGH PAR METER.zip [128.33 KiB]
Downloaded 1751 times
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JairunCaloth
 Post subject: Re: DIY PAR meter
PostPosted: Tue Jan 22, 2013 5:34 pm 
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Joined: Mon Jan 14, 2013 11:36 pm
Posts: 9
Awesome, thanks a bunch O2Surplus.
When I find a new job and have a bit of spare cash I will probably get a few boards made.
FYI: Anyone who attempts to use this in Ubuntu 12.04. The version of eagle in the repo is too old to work with these files. You will want to download and install the latest version manually.
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mogg851
 Post subject: Re: DIY PAR meter
PostPosted: Sun Jan 27, 2013 12:37 am 
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Joined: Sun Jan 27, 2013 12:03 am
Posts: 5
I was watching this over on TPT. Awesome work and great idea!
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