1  // SPDX-FileCopyrightText: 2018 Limor Fried for Adafruit Industries
 2  //
 3  // SPDX-License-Identifier: MIT
 4  
 5  #include <Adafruit_NeoPixel.h>
 6  #ifdef __AVR__
 7    #include <avr/power.h>
 8  #endif
 9  
10  #define PIN 0 //neopixel pin
11  
12  int POT = A1; //analog pin 1 = Trinket m0 Pin 2
13  int val = 0;
14  
15  // Parameter 1 = number of pixels in strip
16  // Parameter 2 = Arduino pin number (most are valid)
17  // Parameter 3 = pixel type flags, add together as needed:
18  //   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
19  //   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
20  //   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
21  //   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
22  //   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
23  Adafruit_NeoPixel ring = Adafruit_NeoPixel(16, PIN, NEO_RGBW + NEO_KHZ800);
24  
25  void setup() {
26    ring.begin();
27    ring.setBrightness(255); //max brightness available for the pot
28    ring.show(); // Initialize all pixels to 'off'
29  }
30  
31  void loop() {
32    val = analogRead(POT); //will hold analog value sent by pot
33    val = map(val, 0, 1023, 0, 255); //maps analog values to digital so that it can be used by the neopixel
34  
35    uint16_t i;
36  
37    //sets all 16 pixels to on and only show level of white light defined by analog value of the pot
38    for (i = 0; i < ring.numPixels(); i++) {
39      ring.setPixelColor(i, 0, 0, 0, val);
40    }
41    ring.show();
42  }