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The more I think of this... Using a drip system on 4 plants, I'm not sure there would be that much of a reservoir temperature issue to begin with. Maybe with 20 plants and 10K watts of lighting. What sort of lights are you planning to use? My 5 gallon reservoir bucket sits on concrete and...

You are correct.

Mt., My drip system uses some flexible pipe I got at the hydro store along with some small tubing. To make it work i just punched a small hole in the flex pipe and inserted the small tube. Attached the small tube to a plastic holder, hooked the flex pipe to a Harbor Freight fountain pump and...

Here is the drawing outlining the connections. Also attached another pic of the CAI board and a solid state relay. pretty simple stuff.

The board, a 9 volt wall transformer, up to 8 DS18b20 temperature sensors, one Honeywell HIH4000 humidity sensor, one solid state relay per output. I was finding some difficulty finding the latest version CAI boards and am currently checking on becoming a reseller for them. There are some of...

Glad to help you get going if you like. Google CAI Webcontrol to see if this would meet your needs. Based on what you wrote, I think it would.

You have really put some work and thought into this. I'm impressed! I have not experimented with robotic arms, but am disassembling a toy 'robotic dog' that has four of them. You have given me some ideas. Great system!

I had to learn a bit of PLC programming using the CAI manual, and was able to make it work. Glad to share the program if anyone wants it.

Here's another idea. I use a PID controller (eBay) and a RTD sensor to control a relay. Mounted it in a box with an outlet on the back. There is probably about $35 invested. I use it for controlling soil temperature with a seed mat but it is configurable to do refrigeration as well.

Doo, Just read your post. You could use the CAI controller to sense the temperature and switch a solid state relay turning the freezer on and off. This would let you control the temperature exactly where you wanted without fear of getting too cold. With that much water this would be a perfect...

Fletch, It does have additional digital and analog inputs, so any commercial ph sensor should work fine. I found some motion sensors cheap on eBay and they work great, so it is just a question of how the sensor outputs.

That Growtronix stuff is nice!

I am controlling lights, fan, and my drip system pump currently. As I posted earlier, I don't think CO2 would be a problem, but I have not actually done it. Dosing ph could easily be done on a periodic basis, but to do it with a closed loop feedback system would require a ph sensor circuit of...

The humidity sensor is a Honeywell HIH 4000 on mine. I have found that it works best when it is attached to the board instead of to a long run of wiring. The temperature sensors are a little tricky to set up at times as they each have their own address, but once set up they seem to work...

I've been using it for over a year without issue. The solid state relays are the real trick. With a 5 volt signal from the board they will switch 25 amps (in my configuration). I didn't really use plans to build as I am an incurable tinkerer myself. Happy to share anything I can as I would...

Here are some photos I took of my homemade controller. The main piece is a CAI Webcontrol board that hooks to an internet cable. Once hooked to the router, the controller is accessed on any computer attached to the same router by typing 192.168.1.15 in the Internet Explorer (or other browser)...

New to the board and am wondering if folks would have an interest in a web browser controlled system that would turn lights, fan, and pump on/off at predetemined times. I have been experimenting with this system for awhile and am considering buying a number of the PC boards to sell. These...