adding delay

A customisable delay that you can use to reset the strip (or omit if you don't need it)

examples/flash.py

@@ -2,7 +2,10 @@ import time
 from ws2812b import ws2812b
 
 num_leds = 30
-pixels = ws2812b(num_leds, 0,0)
+pixels = ws2812b(num_leds, 0,0, delay=0)
+
+pixels.fill(10,10,10)
+pixels.show()
 
 while True:
     for i in range(num_leds):

ws2812b.py

@@ -16,12 +16,16 @@ def ws2812():
     nop()                   .side(0)    [T2 - 1]
     wrap()
     
+#delay here is the reset time. You need a pause to reset the LED strip back to the initial LED
+#however, if you have quite a bit of processing to do before the next time you update the strip
+#you could put in delay=0 (or a lower delay)
 class ws2812b:
-    def __init__(self, num_leds, state_machine, pin):
+    def __init__(self, num_leds, state_machine, pin, delay=0.001):
         self.pixels = array.array("I", [0 for _ in range(num_leds)])
         self.sm = rp2.StateMachine(state_machine, ws2812, freq=8000000, sideset_base=Pin(pin))
         self.sm.active(1)
         self.num_leds = num_leds
+        self.delay = delay
 
     def set_pixel(self, pixel_num, red, green, blue):
         self.pixels[pixel_num] = blue | red << 8 | green << 16
@@ -29,9 +33,11 @@ class ws2812b:
     def show(self):
         for i in range(self.num_leds):
             self.sm.put(self.pixels[i],8)
+        time.sleep(self.delay)
             
     def fill(self, red, green, blue):
         for i in range(self.num_leds):
             self.set_pixel(i, red, green, blue)
+        time.sleep(self.delay)