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Old 03-10-2017, 02:34 AM #41
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This is pretty sloppy, but it's simple. The resistors on the LEDs depend on the LEDs you're using.

I've been using this without the 4.7k-10k resistor without problems, but from what I've read, it's best to use it (I'll eventually find one).
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Old 03-14-2017, 09:45 PM #42
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Finely getting around to testing this. Starting with just an empty box. I have the fogger in the plastic bin with some holes cut out. And for dehumidifying I have a itty-bitty 24V blower (that runs on the same power supply as the fogger).

So far, it's still trying to get up to the proper humidity.
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Old 03-15-2017, 02:48 AM #43
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Nice job assembling that!

You won't get up to the right VPD of the room in that cardboard box.

I've been managing VPD for a few months with a raspi and learned you need to make a TROPICAL RAIN FOREST level of humidity. Right now I am humidifying when <.85 VPD.

You could line the box with a trash bag, but you need to have some ventilation for fresh Co2, so the battle is always on to keep humidity up. Once plants are big enough (think leaf mass) they will humidify your room and you may need to start regulating vent independently to bring down humidity.


Good luck, keep us posted!
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Old 03-15-2017, 04:28 AM #44
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I've very recently discovered the humidity battle now that my plant is big enough and just switched over to flowering yesterday. She alone is keeping my 2x2x5.5ft tent at 57% humidity in a 43% humid room. Looking forward to your findings Bliss.
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Old 03-15-2017, 06:13 AM #45
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I've been managing VPD for a few months with a raspi and learned you need to make a TROPICAL RAIN FOREST level of humidity. Right now I am humidifying when <.85 VPD.
I've got a free raspi 3 coming in with my latest LED driver order. Can you share the code, sensor, and wiring for your raspi VPD manager? Full disclosure: I am a full raspi noob. I know they exist, and that's about it.

Thank you!
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Old 03-15-2017, 10:07 PM #46
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okay i think im going to pull the trigger. wondering what differences i would notice going with an arduino clone versus one that isnt?? I think im gonna just buy all the hardware in post #1?
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Old 03-16-2017, 02:44 AM #47
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okay i think im going to pull the trigger. wondering what differences i would notice going with an arduino clone versus one that isnt?? I think im gonna just buy all the hardware in post #1?
I don't think you'll notice much, if any, difference with a clone vs. a genuine arduino. If you're adventurous enough, you can even build your own arduino.

Buying a genuine arduino will cost a bit more, but you'd be helping the original developer to continue developing.

A cheap clone may have some fit and finish issues but should perform OK. Putting a shield on may require some fiddling with the pins, nothing major. I have a couple of Sainsmart (or something like that) and they've worked for years in continuous duty.
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Old 03-16-2017, 03:03 AM #48
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Right now I am humidifying when <.85 VPD.
Wait, what? If you're talking millibars that's over 95% humidity in most temp ranges. That's way too humid to most peoples standards. Are you using a different pressure unit or am I missing something?
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Old 03-16-2017, 04:14 AM #49
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I've got a free raspi 3 coming in with my latest LED driver order. Can you share the code, sensor, and wiring for your raspi VPD manager? Full disclosure: I am a full raspi noob. I know they exist, and that's about it.

Thank you!
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Old 03-16-2017, 04:16 AM #50
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Wait, what? If you're talking millibars that's over 95% humidity in most temp ranges. That's way too humid to most peoples standards. Are you using a different pressure unit or am I missing something?
From [The ASCE Standardized Reference Evapotranspiration Equation]1
https://physics.stackexchange.com/que...lative-humidit

Given T is temperature in degrees Celsius, and RH is relative humidity:
  1. Saturation Vapor Pressure (es) = 0.6108 * exp(17.27 * T / (T + 237.3))
  2. Actual Vapor Pressure (ea) = RH / 100 * es
  3. Vapor Pressure Deficit = ea - es

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