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Author: TheKitty

Gemma/Gemma_Nano_Ring/Gemma_Nano_Ring.ino

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+// SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Adafruit_NeoPixel.h>
+#define PIN 1
+#define NUM_LEDS 3
+
+Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, PIN, NEO_GRB + NEO_KHZ800);
+
+//                          R   G   B
+uint8_t myColors[][5] = {
+                         {30, 144, 255},   // dodger blue
+                         {232, 100, 255},  // purple
+                         {204, 0, 204},    //  
+                         {200, 200, 20},   // yellow 
+                         {30, 200, 200},   // blue
+                         };
+                               
+// don't edit the line below
+#define FAVCOLORS sizeof(myColors) / 5
+
+void setup() {
+  strip.begin();
+  strip.setBrightness(20);
+  strip.show(); // Initialize all pixels to 'off'
+}
+
+void loop() {
+  flashRandom(10, 1);  // first number is 'wait' delay, shorter num == shorter twinkle
+  flashRandom(10, 3);  // second number is how many neopixels to simultaneously light up
+  flashRandom(10, 2);
+}
+
+void flashRandom(int wait, uint8_t howmany) {
+ 
+  for(uint16_t i=0; i<howmany; i++) {
+    // pick a random favorite color!
+    int c = random(FAVCOLORS);
+    int red = myColors[c][0];
+    int green = myColors[c][1];
+    int blue = myColors[c][2]; 
+ 
+    // get a random pixel from the list
+    int j = random(strip.numPixels());
+    
+    // now we will 'fade' it in 5 steps
+    for (int x=0; x < 5; x++) {
+      int r = red * (x+1); r /= 5;
+      int g = green * (x+1); g /= 5;
+      int b = blue * (x+1); b /= 5;
+      
+      strip.setPixelColor(j, strip.Color(r, g, b));
+      strip.show();
+      delay(wait);
+    }
+    // & fade out in 5 steps
+    for (int x=5; x >= 0; x--) {
+      int r = red * x; r /= 5;
+      int g = green * x; g /= 5;
+      int b = blue * x; b /= 5;
+      
+      strip.setPixelColor(j, strip.Color(r, g, b));
+      strip.show();
+      delay(wait);
+    }
+  }
+  // LEDs will be off when done (they are faded to 0)
+}

Gemma/Gemma_Nano_Ring/code.py

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+# SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+
+import board
+import neopixel
+
+try:
+    import urandom as random
+except ImportError:
+    import random
+
+numpix = 3  # Number of NeoPixels
+pixpin = board.D1  # Pin where NeoPixels are connected
+strip = neopixel.NeoPixel(pixpin, numpix, brightness=.1, auto_write=True)
+colors = [
+    [30, 144, 255],  # Dodger Blue
+    [232, 100, 255],  # Purple
+    [204, 0, 204],  # Pink
+    [200, 200, 20],  # Yellow
+    [30, 200, 200],  # Blue
+]
+
+
+def flash_random(wait, howmany):
+    for _ in range(howmany):
+
+        c = random.randint(0, len(colors) - 1)  # Choose random color index
+        j = random.randint(0, numpix - 1)  # Choose random pixel
+        strip[j] = colors[c]  # Set pixel to color
+
+        for i in range(1, 5):
+            strip.brightness = i / 5.0  # Ramp up brightness
+            time.sleep(wait)
+
+        for i in range(5, 0, -1):
+            strip.brightness = i / 5.0  # Ramp down brightness
+            time.sleep(wait)
+        strip[j] = [0, 0, 0]  # Set pixel to 'off'
+
+while True:
+    # first number is 'wait' delay, shorter num == shorter twinkle
+    flash_random(.01, 1)
+    # second number is how many neopixels to simultaneously light up
+    flash_random(.01, 3)
+    flash_random(.01, 2)