PWM

R2026b

Generate pulse width modulated signal of digital output pin

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PWM block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Raspberry Pi Blockset / Basic

Description

Use the PWM block to vary the power output of a digital output pin. This block enables a digital output to provide a range of different power levels, similar to that of an analog output.

During simulations without the hardware, this block does nothing. See Block Produces Zeros or Does Nothing in Simulation (Simulink).

Note

To generate C/C++ code for this block, you must have an Embedded Coder^® license.

Ports

Input

In — Input value that determines width of square pulses

positive scalar in the range [0, 1]

The block input inherits the data type of the upstream block, and internally converts it to double. The value sent to the block input determines the width of the square wave, called duty-cycle, that the Raspberry Pi^® hardware outputs on the specified PWM pin. The block input accepts a range of values from 0 to 1 (from 0% to 100% of the duty cycle).

For example:

• The maximum input value, 1, sets the duty cycle to 100%, or full power.

• The minimum input value, 0, sets the duty cycle to 0%, or no power.

• An intermediate input value, such as 0.333, sets the duty cycle to 33.3%, or 1/3 power.

• Out of range input values, such as -0.2 or 1.2, output minimum or maximum power.

Data Types: single | double

Parameters

Board — Raspberry Pi hardware board

Pi 4 Model B (default) | Model B Rev1 | Model B Rev2 | Model B+ | Pi 2 Model B | Pi 3 Model B | Pi 3 Model B+ | Pi Zero W | Compute Module 4 | Pi Zero 2 W | Pi 5 Model

Select your Raspberry Pi hardware board. You can find this information on the target hardware, product packaging, or product documentation.

Pin — PWM pin number

21 (default) | 4 | 17 | 27 | 22 | 10 | 9 | 11 | 14 | 15 | 18 | 23 | 24 | 25 | 8 | 7 | 5 | 6 | 12 | 13 | 19 | 16 | 26 | 20 | 21

Select the Raspberry Pi hardware board pin number to which the PWM input signal is connected. To open the pin map of the Raspberry Pi board, click View pin map.

Note

Do not assign the same pin number to multiple blocks within a model.

Frequency — PWM output frequency

500 (default) | 8000 | 4000 | 2000 | 1600 | 1000 | 800 | 400 | 320 | 250 | 200 | 160 | 100 | 80 | 50 | 40 | 20 | 10

Select the output frequency of the PWM signal.

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"raspberrypiBasiclib/PWM"

Example: add_block("raspberrypiBasiclib/PWM","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To generate C/C++ code for this block, you must have an Embedded Coder license. For more information on selecting the right product stack according to your development goals, see Product Stack for Raspberry Pi Blockset.

Version History

Introduced in R2016b