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

Syntax

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

Description

example

````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.```

Examples

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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);`

`rpm = readSpeed(encoder)`
```rpm = 0 ```

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);```

`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