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Extreme NXT: Extending the LEGO MINDSTORMS NXT to the Next Level by Isabelle Hurbain, Philippe Philo Hurbain, Michael Gasperi

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CHAPTER 84.3V Powered Sensors

The NXT provides a DC voltage on the sensor input port for sensors that require a power supply. The LEGO Light and Sound Sensors are examples of sensors powered this way. It's defined as the 4.3V power supply, but the voltage actually varies about 7% with load. The plot in Figure 3-2 shows the voltage ranging from 4.6V, when is the power supply is lightly loaded, to 4.0V when it's fully loaded.

Hall Effect Sensor

The Hall Effect describes a magnetic field phenomenon in semiconducting materials. Without getting overly technical, electrons moving in a semiconductor are deflected by a magnetic field. The amount of deflection depends on the strength and orientation of the field. The deflection becomes a voltage that ...

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