https://learn.adafruit.com/neopixel-gopro-lens-light/

NeoPixel_GoPro_Lens_Light/NeoPixel_GoPro_Lens_Light.ino

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+#include <Adafruit_NeoPixel.h>
+#ifdef __AVR__
+  #include <avr/power.h>
+#endif
+
+#define PIN 0 //neopixel pin
+
+int POT = A1; //analog pin 1 = Trinket m0 Pin 2
+int val = 0;
+
+// Parameter 1 = number of pixels in strip
+// Parameter 2 = Arduino pin number (most are valid)
+// Parameter 3 = pixel type flags, add together as needed:
+//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
+//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
+//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
+//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
+//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
+Adafruit_NeoPixel ring = Adafruit_NeoPixel(16, PIN, NEO_RGBW + NEO_KHZ800);
+
+void setup() {
+  ring.begin();
+  ring.setBrightness(255); //max brightness available for the pot
+  ring.show(); // Initialize all pixels to 'off'
+}
+
+void loop() {
+  val = analogRead(POT); //will hold analog value sent by pot
+  val = map(val, 0, 1023, 0, 255); //maps analog values to digital so that it can be used by the neopixel
+
+  uint16_t i;
+
+  //sets all 16 pixels to on and only show level of white light defined by analog value of the pot
+  for (i = 0; i < ring.numPixels(); i++) {
+    ring.setPixelColor(i, 0, 0, 0, val);
+  }
+  ring.show();
+}

NeoPixel_GoPro_Lens_Light/NeoPixel_GoPro_Lens_Light.py

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+from analogio import AnalogIn
+import board
+import time
+import neopixel
+
+pot = AnalogIn(board.A1)  # what pin the pot is on
+pixpin = board.D0         # what pin the LEDs are on
+numpix = 16               # number of LEDs in ring!
+BPP = 4                   # required for RGBW ring
+
+ring = neopixel.NeoPixel(pixpin, numpix, bpp=BPP, brightness=1.0)
+
+def val(pin):
+    # divides voltage (65535) to get a value between 0 and 255
+    return pin.value / 257  
+
+while True:
+    # Two lines for troubleshooting to see analog value in REPL
+    # print("A0: %f" % (pot.value / 65535 * 3.3))
+    # time.sleep(1)    
+    
+    # change floating point value to an int
+    ring.fill(0, 0, 0, int(val(pot)))
+    time.sleep(0.01)

NeoPixel_GoPro_Lens_Light/README.md

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+# NeoPixel GoPro Lens Light
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/neopixel-gopro-lens-light/