Adafruit QT Py SAMD21

What a cutie pie! Or is it... a QT Py?

by Kattni Rembor

published September 30, 2020, last edited January 22, 2025
last major update March 03, 2023

posted in Adafruit Products Microcontrollers Programming/ MicroPython / CircuitPython STEMMA

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105

Beginner

Product guide

NeoPixel Blink

The QT Py does not have an onboard red LED like so many other boards. We just didn't have any room! Instead, though, you get a very tiny RGB NeoPixel which you can use to give visual feedback.

To use it, first install the NeoPixel library

This example will get you started!

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#include <Adafruit_NeoPixel.h>

// create a pixel strand with 1 pixel on PIN_NEOPIXEL
Adafruit_NeoPixel pixels(1, PIN_NEOPIXEL);

void setup() {
    pixels.begin();  // initialize the pixel
}

void loop() {
    // set the first pixel #0 to red
    pixels.setPixelColor(0, pixels.Color(255, 0, 0));
    // and write the data
    pixels.show();
  
    delay(1000);
    
    // turn off the pixel
    pixels.clear();
    pixels.show();
  
    delay(1000);
}

#include <Adafruit_NeoPixel.h>

// create a pixel strand with 1 pixel on PIN_NEOPIXEL
Adafruit_NeoPixel pixels(1, PIN_NEOPIXEL);

void setup() {
    pixels.begin();  // initialize the pixel
}

void loop() {
    // set the first pixel #0 to red
    pixels.setPixelColor(0, pixels.Color(255, 0, 0));
    // and write the data
    pixels.show();
  
    delay(1000);
    
    // turn off the pixel
    pixels.clear();
    pixels.show();
  
    delay(1000);
}

Page last edited March 08, 2024