Componenets of a Greenohouse

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User Interface

Computer software program

Greenhouse

Outputs/Actuators

Growscale

Cooling pads

Curtain motors

CO2 Generator

Heaters/Boilers

Fans

Heating pumps

Irrigation/Fertigation pumps/solenoids

Vent motor

Lights

Controller

What is a controller?

- A series of microprocessors that do basic computations and number comparisons

Main topic

Sensors

Weight of crop

pH

EC

CO2

Water Flow

Light

Humidity

Temperature

Thermistors are thermally sensitive resistors that we use in the greenhouse to measure temperature.
There are thermistors in the climate control boxes that are calibrated to 20C and in the hot water supply pipes that are calibrated to 90C.

They work by measuring conductivity through the two pieces of metal...at higher or lower temperatures the resistance changes and the computer translates this info to something understandable to us (degree Celsius).

Pipe/Mixing valve

Leaf

Boiler