neopixel example taken from MicroPython docs

examples/20-neopixel/main.py

@@ -1,14 +1,49 @@
+# https://docs.micropython.org/en/latest/esp8266/tutorial/neopixel.html
+
 from machine import Pin
 from neopixel import NeoPixel
 import time
 
-n_leds = 60
-data_pin = 25
+def demo(np):
+    n_leds = np.n
+    print(f"{n_leds} LEDs")
+
+    print("cycle")
+    for i in range(1 * n_leds):
+        for j in range(n_leds):
+            np[j] = (0, 0, 0)
+        np[i % n_leds] = (255, 255, 255)
+        np.write()
+        time.sleep_ms(125)
 
-np = NeoPixel(Pin(data_pin), n_leds)
+    print("bounce")
+    for i in range(1 * n_leds):
+        for j in range(n_leds):
+            np[j] = (0, 0, 128)
+        if (i // n_leds) % 2 == 0:
+            np[i % n_leds] = (0, 0, 0)
+        else:
+            np[n_leds - 1 - (i % n_leds)] = (0, 0, 0)
+        np.write()
+        time.sleep_ms(60)
 
-for i in range(n_leds):
-    np[i] = (255, 0, 0)
+    print("fade in/out")
+    for i in range(0, 4 * 256, 8):
+        for j in range(n_leds):
+            if (i // 256) % 2 == 0:
+                val = i & 0xff
+            else:
+                val = 255 - (i & 0xff)
+            np[j] = (val, 0, 0)
+        np.write()
+
+    print("clear")
+    for i in range(n_leds):
+        np[i] = (0, 0, 0)
     np.write()
-    print(f"LED #{i}")
-    time.sleep_ms(250)
+
+# Vcc
+# GND
+# 15/A4 (FireBeetle v2)
+np = NeoPixel(Pin(15), 60)  # 60 LEDs
+demo(np)