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readBeaconProximity

Read distance and heading from infrared sensor to beacon

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Add-On Required: This feature requires the MATLAB Support Package for LEGO MINDSTORMS EV3 Hardware add-on.

Syntax

[proximity,heading] = readBeaconProximity(myirsensor,channel)

Description

[proximity,heading] = readBeaconProximity(myirsensor,channel) measures the relative proximity and heading from the infrared sensor to the infrared beacon. The function returns the proximity as a value from 0 to 100 (near to far), and returns the heading as a value from -25 to 25 (left to right). The maximum range from the sensor to the beacon is approximately 200 cm (79 inches).

example

Examples

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Measure the relative distance from an infrared sensor to an EV3 IR beacon.

Create a connection to the EV3 brick called myev3.

myev3 = legoev3
myev3 = 

  legoev3 with properties:

      FirmwareVersion: 'V1.03E'
           HardwareID: []
            IPAddress: []
    CommunicationType: 'USB'
         BatteryLevel: 0
     ConnectedSensors: {'touch'  'infrared'  'color'  'sonic'}

The sensor appears in the list of connected sensors.

Create a connection to an infrared sensor.

myirsensor = irSensor(myev3)
myirsensor = 

  irSensor with properties:

      Channel: 1
    InputPort: 2

Read the relative distance and heading from the infrared sensor to an IR beacon that is using channel 2.

[proximity,heading] = readBeaconProximity(myirsensor,2)
proximity =

 -128


heading =

    0

These values indicate that no one is pressing a button on the IR beacon.

Press a button on the IR beacon and try again.

[proximity,heading] = readBeaconProximity(myirsensor,2)
proximity =

   26


heading =

  -14

The IR beacon is 26 distance units away from, and 14 heading units to the left of, the sensor.

Input Arguments

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Connection to infrared sensor, specified as a string that represents the object created using irSensor.

Data Types: char

The channel number that the IR beacon uses, specified as a double. The red switch on the beacon has four positions that determine the channel number. The forward position is channel 1.

Example: 2

Data Types: double

Output Arguments

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Relative distance from the sensor to the IR beacon, returned as an int8 value, from 0 to 100 (near to far).

Relative heading from the infrared sensor to the IR beacon, returned as an int8 value, from -25 to 25 (left to right).

See Also

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