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Raspberry Pi Home Automation with Arduino by Andrew K. Dennis

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Introducing the thermostat

A thermostat is a control device that is used to manipulate other devices based upon a temperature setting. This temperature setting is known as the setpoint . When the temperature changes in relation to the setpoint, a device can be switched on or off.

For example, let's imagine a system where a simple thermostat is set to switch an electric heater on when the temperature drops below 65 degrees Fahrenheit.

Within our thermostat, we have a temperature-sensing device such as a thermistor that returns a temperature reading every few seconds. When the thermistor reads a temperature below the setpoint (65 degrees Fahrenheit), the thermostat will switch a relay "on", completing the circuit between the wall plug and our electric ...

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