NeoPixel

R2026b

Control color and brightness of RGB and RGBW Adafruit NeoPixel LED strip

Since R2024a

• 

NeoPixel 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:
Simulink Support Package for Arduino Hardware / Common

Description

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

Use the NeoPixel block to control the color and brightness of RGB or RGBW Adafruit^® NeoPixel LED strip. Using the block, you can set the color of individual pixels for a three-color format (red–green–blue) or a four-color format (red–green–blue–white) NeoPixel strip. The block supports configuring a maximum of 1024 pixels on the NeoPixel LED strip.

Limitations

• The NeoPixel block does not support the Arduino^® Nano 33 BLE Sense and ESP32-S3 series of boards currently.

• You can use up to 10 NeoPixel blocks in a Simulink^® model and deploy the model to an Arduino board.

• If you use the NeoPixel block with the Input Capture, Servo Write, Standard Servo Read, SAMD Hardware Interrupt, AVR Hardware Interrupt, External Interrupt, or Encoder blocks in a Simulink model, the NeoPixel block might not behave as expected.

Ports

Input

LEDPosition — NeoPixel LED position to blink

matrix

Use this port to specify the LEDs on the NeoPixel strip to blink. Input the LED positions as an N-by-1 matrix, where N ranges from 0 to (Number of pixels - 1). Ensure that the value you input to this port must lie between 0 to No. of pixel. The block ignores any input values out of this range.

Data Types: uint16

RGBColor — RGB components of NeoPixel LED strip

matrix

Use this port to specify the RGB components of the NeoPixel LED strip. Specify the components an N-by-3 matrix. The values of R, G, and B for each pixel must lie in the range 0 to 255.

Dependencies

To enable this port, set Color format of pixel to either GRB, RGB, RBG, or BRG.

Data Types: uint8

RGBWColor — RGBW components of NeoPixel LED strip

matrix

Use this port to specify the RGBW components of the NeoPixel LED strip. Specify the components as anN-by-4 matrix. The values of R, G, B, and W for each pixel must lie in the range 0 to 255.

Dependencies

To enable this port, set Color format of pixel to either RGBW, RBGW, WRGB, WGRB, WRBG, WBGR, GRBW, GBRW, BRGW, or BGRW.

Data Types: uint8

Brightness — Adjust brightness of each LED pixel

positive integer in the range [0, 255]

Use this port to adjust the brightness of each NeoPixel LED. An input value of 255 indicates maximum LED brightness, while an input value of 0 indicates minimum LED brightness

Data Types: uint8

Reset — Option to reset pixel values of NeoPixel LED strip

0 | 1

Use this port to reset or accept the pixel values of the NeoPixel LED strip.

• 0 — The block accepts the RGB and RGBW components of the NeoPixel LED strip.

• 1 — The block resets all the pixels of the NeoPixel LED strip.

Data Types: Boolean

Parameters

Digital pin (Din) — Digital pin on Arduino board

6 (default) | Arduino board pin number

Specify the digital pin number of the Arduino board to which the NeoPixel strip is connected. Click View pin map to open the Arduino pin mapping table. For more information on how to assign pins or to view the pins for the NeoPixel block, see Pin Mapping for Arduino Timer-Independent Blocks.

No. of pixel — Number of LED pixels

24 (default) | positive integer in the range [0, 1023]

Specify the number of sequential LED pixels in a NeoPixel strip.

Color format of pixel — NeoPixel color format

GRB (default) | RGB | RBG | BRG | RGBW | RBGW | WRGB | WGRB | WRBG | WBGR | GRBW | GBRW | BRGW | BGRW

Set the NeoPixel color order format.

Frequency of pixel — NeoPixel bitstream frequency

800KHz (default) | 400KHz

Select the frequency at which the NeoPixel LED strip receives data from the Arduino board.

Note

For a NeoPixel strip that uses 800 kHz of bitstream frequency, after the Arduino board sends the last pixel data to the strip, the streaming must stop for at least 50 μsec for the new color to latch on to the LED strip.

Version History

Introduced in R2024a