4.3V Powered Sensors

  • Michael Gasperi
  • Philippe “Philo” Hurbain


The NXT provides a DC voltage on the sensor input port for sensors that require a power supply. (The LEGO Light Sensors 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 8-1 shows the voltage ranging from 4.6V, when the power supply is lightly loaded, to 4.0V when it’s fully loaded. It is important to note that this plot is for the total current of all the ports put together.
Figure 8-1

4.3V supply voltage versus current


Light Sensor Versus Power Hall Sensor Versus Power Supply Sound Sensor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Michael Gasperi and Philippe “Philo” Hurbain 2009

Authors and Affiliations

  • Michael Gasperi
  • Philippe “Philo” Hurbain

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