... becomes too hot for plants to survive. The specification that they have given me is as follows: * The temperature sensor should be able to detect when the temperature drops bellow 20°C and when the temperature rises above 30°C. The optimum temperature for growing plants is about 25°C. The company have a series of heaters in the greenhouses and underneath the soil, which could be used to raise the temperature within the greenhouses, when the growing conditions become too cold. The greenhouses that the company use also have windows that could be opened when the temperature inside the greenhouse becomes too hot. Ways to measure temperature. Ways to measure temperature can include; * A thermocouple * A thermistor * Wheatstone bridge * A Resistance temperature Detector (RTD) A thermocouple uses two pieces of dissimilar metals that have a contact potential between them, and this contact potential changes as the temperature changes. The problem with using a ...

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