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Analog Sensor

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class AnalogSensor(port, custom=False)

Generic or custom analog sensor.

Parameters:

  • port (Port) – Port to which the sensor is connected.

  • custom (bool) – Set to True if you are using a custom analog sensor.

Raises:

OSError – If no standard LEGO analog sensor is detected on the port. Only applies if custom=False.

voltage() → int: mV

Measures analog voltage.

Returns:

Analog voltage.

resistance() → int: Ω

Measures resistance.

This value is only meaningful if the analog device is a passive load such as a resistor or thermistor. It is calculated assuming a 10 kΩ internal pull-up resistor forming a voltage divider.

If the circuit is open (no load connected), the maximum integer value is returned.

Returns:

Resistance of the analog device, or the maximum integer value if the circuit is open.

active()

Sets sensor to active mode. This sets pin 5 of the sensor port to high.

This is used in some analog sensors to control a switch. For example, if you use the NXT Light Sensor as a custom analog sensor, this method will turn the light on. From then on, voltage() returns the raw reflected light value.

passive()

Sets sensor to passive mode. This sets pin 5 of the sensor port to low.

This is used in some analog sensors to control a switch. For example, if you use the NXT Light Sensor as a custom analog sensor, this method will turn the light off. From then on, voltage() returns the raw ambient light value.