GPIO Read

Read GPIO pin status

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Libraries:
Raspberry Pi Blockset / Basic

Description

Use the GPIO Read block to read the logical value of a digital pin of your Raspberry Pi^® board.

Warning

You can damage your target hardware by:

• Exceeding the maximum voltage that can be applied to GPIO pins.

• Shorting a GPIO pin to ground.

• Shorting a GPIO pin with high voltage to another GPIO pin with low voltage.

• Connecting a GPIO pin to a voltage source greater than the maximum voltage.

• Exceeding the maximum current by driving multiple GPIO pins high simultaneously.

Note

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

Examples

Detect Motion Using Passive Infra-Red Sensor Interfaced with Raspberry Pi

Use Raspberry Pi® hardware to interface to a motion sensor and control an external LED.

• Open Model

Ports

Output

Port_1 — Output port containing logical value

scalar

The block outputs the logical value of a digital pin.

Data Types: Boolean

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.

GPIO number — GPIO pin of Raspberry Pi hardware board

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

Select a GPIO pin of the Raspberry Pi hardware board to read its logical status. Do not use the same GPIO pin in multiple blocks within the Simulink^® model. For more information on Raspberry Pi GPIO pins, click View pin map.

Sample time — Time interval to read logical status on GPIO pin

0.1 (default) | scalar

Enter the sample time to reading the logical value of the GPIO pin. Smaller values require the processor to complete the same number of instructions in less time, which can cause task overruns. Enter a value greater than zero.

Extended Capabilities

C/C++ Code Generation

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

To generate code 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 R2013a