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This control system is more advanced than the simple greenhouse control system described previously. As well as keeping the greenhouse warm in the winter it also prevents the greenhouse overheating in hot weather.
The system keeps the temperature of the greenhouse between 20°C and 26°C. If the temperature drops below 20°C then a heater is turned on to warm the greenhouse up. If the temperature rises above 26°C then a fan is turned on to cool the greenhouse down by blowing cold air from outside into the greenhouse.
The important components of this system are :
Input and Output Devices
The control system has these input and output devices :
| Input Devices | Output Devices |
| Temperature Sensor | Heater Fan |
Flowchart
The operation of the system is described by this flowchart :
GCSE ICT Companion 04 - (C) P Meakin 2004