feat: Cycle NeoPixel 0 through red, green, blue, and orange

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

demos/neopixel/neopixel.ino

@@ -11,25 +11,30 @@
 // strandtest example for more information on possible values.
 Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
 
-#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels
+#define DELAYVAL 1000 // Time (in milliseconds) to pause between pixels
 
 void setup() {
   pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
 }
 
 void loop() {
-  pixels.clear(); // Set all pixel colors to 'off'
+  // red
+  pixels.setPixelColor(0, pixels.Color(150, 0, 0));
+  pixels.show();
+  delay(DELAYVAL);
 
-  // The first NeoPixel in a strand is #0, second is 1, all the way up
-  // to the count of pixels minus one.
-  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...
+  // green
+  pixels.setPixelColor(0, pixels.Color(0, 150, 0));
+  pixels.show();
+  delay(DELAYVAL);
 
-    // pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
-    // Here we're using a moderately bright green color:
-    pixels.setPixelColor(i, pixels.Color(0, 150, 0));
+  // blue
+  pixels.setPixelColor(0, pixels.Color(0, 0, 150));
+  pixels.show();
+  delay(DELAYVAL);
 
-    pixels.show();   // Send the updated pixel colors to the hardware.
-
-    delay(DELAYVAL); // Pause before next pass through loop
-  }
+  // orange
+  pixels.setPixelColor(0, pixels.Color(150, 75, 0));
+  pixels.show();
+  delay(DELAYVAL);
 }