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readSpeed

Read current rotational speed

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

Syntax

rpm = readSpeed(encoder)
rpm = readSpeed([encoder1,encoder2])

Description

rpm = readSpeed(encoder) returns the current rotational speed measured by the single quadrature encoder in revolutions per minute.

example

rpm = readSpeed([encoder1,encoder2]) also returns the current rotational speeds measured by the two quadrature encoders in revolutions per minute.

example

Examples

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This example uses:

Open Live Script

Create an Arduino® object with the 'rotaryEncoder' library.

a = arduino('COM4','Uno','Libraries','rotaryEncoder');

Connect to the encoder that is connected to your Arduino board.

encoder = rotaryEncoder(a,'D2','D3',180);

Read the current rotational speed.

rpm = readSpeed(encoder)
rpm = 0

This example uses:

Open Live Script

Create an Arduino object with the 'rotaryEncoder' library.

a = arduino('COM8','Mega2560','Libraries','rotaryEncoder');

Connect to the encoders that are connected to your Arduino board.

encoder1 = rotaryEncoder(a,'D2','D3',180);
encoder2 = rotaryEncoder(a,'D18','D19',180);

Read the current rotational speed.

rpm = readSpeed([encoder1,encoder2])
rpm = 1×2

     0     0

Input Arguments

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Quadrature encoder connection, specified as a single rotaryEncoder object or a vector of rotaryEncoder objects.

Note

Specify pulse per revolution while creating the rotaryEncoder object to use this function.

Output Arguments

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Current rotational speed measured by the quadrature encoder in revolutions per minute, returned as a double or vector of doubles.

Note

The speed measurement interval of 20 ms is used to calculate the rotational speed.

Version History

Introduced in R2017a

See Also

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