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I will keep all posted.

I'm wondering if you agree with Dr. Who about VPD swings. With my system, I am running up and down between 1.0 and 1.3 or so. This doesn't seem horrid to me. I cannot maintain a true constant with the equipment/environment I have. Besides, I'm holding with my theory that if plants respirate...

I wrote software to do this (I'm a programmer). It's on GitHub for the sharing. I am using SensorPush sensors. They have a gateway that allows my software to poll the device via an API. I am using TLink Smart Plugs to control my devices. These also have an API that allows my software to turn the...

https://github.com/stuartmayhew/TentControlVPDMonitor I'm not sure that will work

I'm still tweaking it. I live in a hot, humid climate, esp. during the summer. With (xxx) plants and a handful of SF 4000 LEDs going, there's no telling what will happen. Im growing no til organic so dont worry about nute burn in theory. but thats an intersting point.

I have a thought (because this is what mine does) that if you cycle between 1.0 and 1.5 you get the best of both worlds.

thats an explantion that makes sense. thanks man

heres the result

So a couple months ago, I asked the question here What is VPD and why should I care? Got some good info. Did a shit load of research. A software engineer, I wrote some. See my screen shot. I test a probe from my friends at Sensor Push, and use that to control smart plugs to AC, Humidifier and...

Here's my soil testers waiting for me to setup their new tent. They look EXTREMELY pleased with my formula! It's no till.

that's part of my additives. And I got worm compost. Love some worm shit don't they?

at 40-50 bucks a bag I'm good with the peat/perlite/compost suggestion.

Disjointed on Netflix if you haven't seen it. I recounted. It's more like 50 years. I'm 63. I've earned the right to be a mean old fuck, and I enjoy it immensely.

dope will get you through times of no money, better then money will get you through times of no dope fabulous furry freak brothers I've been saying that for 40 years.

This is my base mix. What would you guys replace that biobiz with? growing no til. Base mix: 5 gal BioBiz light 5 gal Cow Manure 5 gal Peat Moss 5 gal Perlite 1 shovel full of AL dirt with ground cover

@ Yeah, I'm seeing the same in my 5 week old Gelato. Keeping my VPD in the .9 - 1.1 range with my software (see other post)

I am using SensorPush. $200 and you have all you need to read temp and humidity. It reports VPD but it's calculated. They provide a pretty simple API that you can use to poll the sensors (they read every 60 seconds). I have an IR thermometer that I use to read leaf temp. I do that at various...

I have a small AC unit, $225 at walmart. U don't want a fan that big in a tent that size.

OK, thanks for all the information you guys supplied. I'm all off into this now. I've actually written code to calculate the VPD. It's in C#, it's attached. The Leaf Temp is what throws me. It APPEARS that my leaf temp difference is about -2 with light and -4 without. That seems consistent...

I went and got my own chart maker. These values are wider than the chart I have. Thanks~