readSpeed

Read current rotational speed

Syntax

rpm = readSpeed(encoder)

rpm = readSpeed([encoder1,encoder2])

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

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

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

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

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.

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.

Introduced in R2017a