The idea behind GHs is to have control over the variables that make for optimal growth. This means you can prevent bad things & make good things happen. But it also means YOU, rather than nature, has to make sure all these things are in place & in balance, juggling multiple variables & interplays. Some of the variables are Temp, Water, light, nutrients, Ventilation, Pollination, Pest control. These requirements are different for different plants, & timing is important also.
GREENHOUSE DESIGN----1 2 3 4
TEMP--MAX--need some heat source with auto-regulation, because I'm not able to be there all the time, or may forget. When it gets too hot, Hoop houses can be regulated by removing/rolling up the cover. This is made less critical with row cover instead of plastic, because it is more forgiving, but ideally there needs to be a way to automatically vent hot air.
--Automatic Vent Openers $30-50
Integrated Greenhouses/Aquap, etc
1--3 BoysFarm in Florida--hydro
2--Living Fresh Lettuce--hydro
3--City Roots--Aqua+ Micro
4-- 5 6
LittleBits --easy arduino = $200
This kind requires no electricity & operates on a gas cylinder--knob sets opening at 59-77F.
--Louvered Fan =$65-250--
To connect these sensors to Arduino, we suggest to use our IO expansion shield V5 which has color coded pins that provides a much easier way to link sensors to microcontroller.
SENSORS
--ArduinoTemp/Humidity Sensor=$4
LM35 Analog Linear Temperature Sensor (DFR0023).
Need vent at bottom of GH + fan at top, or one in peak of ea end. There's gotta be a cheaper way.------DeskFan or ClipFan
--Soil Moisture Sensor (SEN0114).
--Digital Infrared motion sensor (SEN0018).
--Analog Carbon Monoxide Sensor (MQ7) (SEN0132).
--Raindrops module
--
4.7" =1200 RPM>>44 CFM--should be enough for small GH, but have to figure out how to wire it into 110v.--but it should work especially well w/ Arduino.
THERMOSTAT-- for max & for Min
--Tstat outlet=$12-20--simplest way-- keeps it 45-70, but doesn't give any control in between
The Cooling outlet supplies power at 78° and cuts off at 70° and works great for all types of fans including exhaust, circulation, window, attic, and ceiling fans. The Heating outlet supplies power at 35° and cuts off at 45°
--Heat/Cool Thermostat=$35
This is more precise, but you have to break into the back & wire it to fan/heater, etc.
--Arduino--see Arduino heading
FAN+LOUVRES on Thermostat