DIY PAR meter, Yeah you heard me - Page 34 - The Planted Tank Forum
 
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post #496 of 733 (permalink) Old 02-12-2013, 10:41 PM
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lol, it's actually pretty easy now. It should go pretty fast. By the way, the meter you build is quality stuff.
Hey thanks! I just keep practicing. Design....build.....re-design.....re-build. I find my mistakes at each design iteration and keep going. Eventually I'm able to create something that actually works.LOL... I really want/need to learn how to write software though, but that may never happen, as this "Old dog" is finding it harder to learn "new tricks".

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post #497 of 733 (permalink) Old 02-12-2013, 11:37 PM
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Whenever I'm free. I still have ~14 more to build. After that, that's it for me.
Start turning a small profit on it I'm sure these would comfortably still sell at $80. Just personal opinion tho hah
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post #498 of 733 (permalink) Old 02-13-2013, 01:24 AM Thread Starter
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Start turning a small profit on it I'm sure these would comfortably still sell at $80. Just personal opinion tho hah
Nah, profit was never the goal. If you add shipping it's up around $80. Oh, I just saw the paypal fee. It's pretty high.


Last edited by mistergreen; 02-13-2013 at 01:38 AM. Reason: --
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post #499 of 733 (permalink) Old 02-13-2013, 02:00 AM
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Very neat project. Thanks for sharing. I began reading this thread a little over a year ago when you first started this project and promptly lost track. After catching up, things have really progressed nicely! I may have to run down to the local RShack to see if I can pick up one of these Arduino things, an LCD display, etc., and build one of your PAR meters myself now! It doesn't seem terribly difficult, but at least I can always come here if I have any questions, I hope. Thanks again for all your hard work, both of you, and for sharing.

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post #500 of 733 (permalink) Old 02-17-2013, 04:26 PM
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missed the sales, sigh......
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post #501 of 733 (permalink) Old 02-25-2013, 01:00 AM
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missed the sales, sigh......
same here. bummed
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post #502 of 733 (permalink) Old 03-02-2013, 09:11 PM
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How much tweaking of the calibration pot are you guys having to do to get the thing calibrated against the real PAR meter? Is the circuit still as the first post, but with a pot inline with the fixed resistor? If so, what's the typical pot setting when in cal?

Peter
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post #503 of 733 (permalink) Old 03-02-2013, 09:35 PM Thread Starter
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DIY PAR meter, Yeah you heard me

Quote:
Originally Posted by Whitebeam View Post
How much tweaking of the calibration pot are you guys having to do to get the thing calibrated against the real PAR meter? Is the circuit still as the first post, but with a pot inline with the fixed resistor? If so, what's the typical pot setting when in cal?

Peter
I just measured the resistance of a calibrated meter. I got 24.7 k ohm.

There's an inline 15k and the pot is 10 or 15k.

Sent from my iPad using Tapatalk HD

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post #504 of 733 (permalink) Old 03-03-2013, 06:17 PM
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I just measured the resistance of a calibrated meter. I got 24.7 k ohm.

There's an inline 15k and the pot is 10 or 15k.
My thanks for that. Any idea how consistent that 24.7 from one meter to the next?

Peter
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post #505 of 733 (permalink) Old 03-03-2013, 06:37 PM Thread Starter
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not sure. I'll measure more when I make them but they all should be around that.

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post #506 of 733 (permalink) Old 03-08-2013, 08:36 PM
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Final build howto?

Mistergreen,

I was wanting to build myself one of these 'good enough par' meters.
But I am having a bit of trouble imagining how you incorporated the diffuser plastic (2447) into the build. Would building an acrylic box out of it and mounting the diode inside be a good plan?

Any chance you can do a writeup of the final build howto including the plastic diffuser?
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post #507 of 733 (permalink) Old 03-08-2013, 09:12 PM Thread Starter
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You just need the light to be filtered. It's up to you how you waterproof it. The black thing is a 1/4" Heyco cord grip. It makes the wire coming into the cup waterproof.




Last edited by mistergreen; 03-09-2013 at 01:10 AM. Reason: -
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post #508 of 733 (permalink) Old 03-15-2013, 03:24 AM
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Thanks for the pictures!
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post #509 of 733 (permalink) Old 03-20-2013, 02:07 PM
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Gents,

I've stumbled across this thread while searching Google for Arduino Quantum Light Sensors. After a pretty thorough read let me extend my congratulations. Your ingenuity inspired me to get on this form and see what other types of neat things are happening.

I'm a hydroponic tomato, cucumber, lettuce, daisy grower. Measuring PAR (400-700nm) is super important, especially with our lettuce. I'm curious, you're measuring PAR underwater or are you utilizing it above, or both? I'm looking to place this sensor 12" above canopy height.

This is going to be my first arduino project as well so wish me luck. Is there a list of the most updated parts that need to be purchased? I noticed a few posts going back and fourth about changing particular things for final production. I have an expensive quantum sensor at the university I can use to calibrate this with as well. Would be happy to post videos and pictures!

CHEERS!
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post #510 of 733 (permalink) Old 04-05-2013, 06:48 AM
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mistergreen,
this is a very interesting read, for that i thank you very much. i have to admit i got about half way threw this thread before posting this but, did you ever find a way to callibrate these without going out and buying/barrowing an off the shelf unit?
i think id hate myself to buy something like this when i enjoy building it myself XD. at this point i just need a way to calibrate anything i come up with....

edit:
i saw you offered to calibrate another member's par meter, is that an open offer? when i build mine would you be willing to do the same for me?

again thanks so much for the great article!!!

Last edited by genocdex; 04-05-2013 at 08:05 AM. Reason: spelling
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