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Make: Action by Simon Monk

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Chapter 12. Control Loops

Although this is a book primarily about actuators (motors, heaters, lights, and other “outputs”), many systems that use actuators will also use sensors to monitor the actuator. A typical example of this is a thermostatically controlled heater, where the power to the heating element would be controlled in response to readings from a temperature sensor. This can be as simple as on/off control or a more advanced technique such as proportional-integral-derivative (PID) control.

This chapter looks at how sensors and actuators are combined to make a control system; we’ll apply this technique to expand the beverage cooler project we completed in Chapter 11.

The Simple Thermostat

Perhaps the best starting point for understanding ...

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