Tachometer

Read rotational speed of shaft

• Library:

• Simulink Support Package for Arduino Hardware / Sensors

• 

Description

The Tachometer block reads the rotational speed of the shaft from the tachometer connected to the hardware. The block outputs the speed of rotation as a uint32 value.

If you simulate a model that contains the Tachometer block without connecting the hardware, the block outputs zeros. For more information, see Block Produces Zeros or Does Nothing in Simulation.

Ports

Output

Port_1 — Rotational speed of shaft

scalar

The port outputs the rotational speed of the shaft connected to the hardware.

Data Types: uint32

Parameters

Pin number — Pin number on hardware

16 (default)

Specify the pin number on the hardware to which the tachometer is connected.

Click View pin map to open the Arduino Pin Mapping table .

To know how to assign pins for the block, see Pin Mapping for Arduino Timer Independent Blocks.

For more information about the pins supported on the hardware for interrupts from the tachometer, see Pins With Interrupts.

Interrupt mode — Counting technique of tachometer signal

RISING (default) | FALLING | CHANGE | LOW | HIGH

The interrupt mode specifies how the tachometer counts its output signal. The counting technique is different for different interrupt modes:

• RISING – Counts every rising edge of the signal.

• FALLING – Counts every falling edge of the signal.

• CHANGE – Counts every rising and falling edge of the signal.

• LOW – Counts every low signal.

• HIGH – Counts every high signal.

This figure shows how the tachometer counts its output signal in different interrupt modes.

Pulse count per rotation — Number of interrupts each rotation

1 (default) | any positive integer

Specify the number of interrupts the block receives each rotation.

Sample time — Time interval to read value from tachometer

0.1 (default)

Specify how often the block reads the rotational speed from the tachometer, in seconds.