Definitely, you had me at "tennis ball green" and to top it off you went on to mention automation.
First my thoughts:
- Looks excellent man, very clean setup.
- I use a chiller, to get it down to 65 (and then it warms up to 68 before it starts chilling again). I wouldn't make much of an effort to get it cooler, I'm already happy when it stays on 68 or lower.
- I wouldn't go with an NFT in any case. That's oldskool hydroponics and not really fit for MJ imo. The F stands for film, which is millimeters (opposed to inches in my system) and to get that to cover all roots you'd have to spread them out. My system is basically an RDWC, the tubes are the buckets, the res is the brain/control bucket FWC, flowing water culture? . The advantage of the latter is that you can add and mix nutes and PH control without throwing it on roots directly. In my case it also separates the air stones from the roots (air stones in res not tubes), hence easy to replace and clean.
I'm currently working 2 jobs. Spare time is a luxury I don't have. So, over the course of this run, I'll be adding quite a bit of automation. Automatic pH control, timed res fill/drain, a float valve to keep water levels stable, and maybe a chiller when I have extra cash. I'm working on hooking up a live streaming webcam, and remote wifi switch to the AC that will control heat and humidity from my phone.
Sounds a lot like some posts I made a few days ago in dutch grow forum. One of the members there hooked up blumat tensiometers to an arduino. The blumat tensiometers (artificial root from ceramic) are extremely popular here. I mentioned them several times in my earlier posts at RIU, referring to it as the magic wand for soil growers. I highly recommend it to both beginners (no more under/overwatering) and pros (better insight in water need optimize yields). It has a small display that shows the pressure in mBar. The guy basically turned it into a central wireless monitoring system (lv, lux, air temp, soil temp, and soil humidity) and is working on automating watering based on the info.
It's in dutch, but the pics tell a lot:
http://www.wietforum.nl/Zelf-digitale-Tensiologgers-maken-t103667.html (I usually don't link to other forums but it's dutch no competition for RIU - in case any mod starts cringing at the link.)
I bought an Arduino months ago but apart from some tutorial projects I haven't done much with it yet. Thanks to that guy above I'm motivated again to finish the project. Too many ideas to list, main points are measuring water uptake under different circumstances (after removing leaves, after feeding PK13/14, after temp changes etc, etc). Instead of using such tensio meters for soil I'm going to use a sonar sensor to measure distance from ceiling inside res to a floater in a tube, so I can calculate water use based on that. I got an unused PH probe from a defective Hanna meter I got to keep after getting a new set, which I'm going to hook up to
this one. So I will have lux, lv, air temp, temp in rez, temp in tubes, water level, and ph. I had a webcam taking shots every X minutes on a soil run last year, with glass from sunglasses in front of it. Problem for me is that I'm in such a small space now I can't get a decent wide view with the cheap webcam I used in my small closet.
I considered several automation options:
- Emergency shutdown via phone
- Open flame sensors and gsm modules to send text message to my phone if my house is on fire
- Solenoid pumps to alternate the sprayers/tubes.
- Dosing pumps for PH up/down
Decided not to pursue the last option because:
- ph drift is good, will allow the plant to feed on all elements (google PH nutrient uptake chart for hydro)
- when you feed them what they want and no more and no less, the PH will remain fairly stable. If it doesn't, something else needs to be fixed (often a matter of adding either more water or nutes), not the PH.
I am still considering those dosing pumps, but only to be able to add pH up/down with an up and down button on the outside of my closet. Basically set it to 5.8 and it will automatically, slowly, adjust the pH in the res till the measurement of the pH probe matches what I entered on the display - and 'not' to keep it leveled after that initial setting.
Working on my new closet first, new setup next, and then I'll definitely finish the monitoring part of the project this year. As for automating, I switched to hydro to spent some 'more' time on growing, turns out that once you got it dialed in and stable, there's not much to do. Top off with water sometimes, which in turn can require adjusting ph and nutes (unless nutes where to high and ph too low, which usually goes together). Point is, without controlling the water level there's not much point in automating ph and nutes either. Regardless of the water level in the rez, the water level in my tubes is always the same, dictated by the dam at the end of the tube. You specifically do want to control the water level, so it makes more sense to automate the rest too.
So... if you ever want to exchange thoughts about it feel free to post it here. It'll be totally on-topic in Sativied's Indoor Garden thread sooner or later anyway
Have fun with your new grow setup, I look forward to seeing big plants with big buds with big calyxes with big trichs in it!