Chapter 2. Basic Sensors
Get ready to wire a few more sensors and learn a bit more theory. The circuits you will build in this chapter do not need to be programmed, which is to say, they will not use an Arduino or a Raspberry Pi. The sensor’s data will be “interpreted” by the electrical properties of each component in the circuit design.
A sensor is a physical input to a circuit. Sensors are transducers. The process of converting sensed energy into another form is called transduction. For example, a light sensor transduces luminosity into resistance.
Another type of transducer is an actuator. Rather than reacting to something in the environment, an actuator makes something happen. An actuator is a physical output of a circuit. An LED, for example, ...
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