Editing LED Ring NeoPixel

= Description =
The NeoPixel ring has 3 connections: GND, +/VCC, and the signal/IN. The signal is connected to an output pin and given as parameter (in the example pin 0). The chip to decode the protocol - built into the NeoPixel ring - is WS2812. They are also available in different sizes (more or less LEDs) and different shapes (e.g. band). You have to provide the total number of LEDs as parameter.

If you need more than one ring (or other arrangements), you can put them in a row - basically connecting the next ring to the first one (you have to solder it on).

[[File:Neopixel1.PNG|x300px]]
[[File:Neopixel2.PNG|x300px]]

= How to connect it electrically =
You can "chain" them. If you only have one ring, just connect GND, VCC, and In.

[[File:Neopixel3.PNG|400px]]

[[File:LedRing.PNG|x400px]]
[[File:RingSetup.jpg|x400px]]

= How to control it in MicroPython =
<syntaxhighlight lang="python" line='line'>
import neopixel
from machine import Pin

# number of leds
n=8
# connected Pin
p=0

np = neopixel.NeoPixel(Pin(p),n)

# sets color of the led at position 0 to (r,g,b)
np[0] = (255,0,0)
# colors the leds
np.write()
</syntaxhighlight>

= A small Program in MicroPython =
<syntaxhighlight lang="python" line='line'>
# todo 
# code goes here
</syntaxhighlight>



= Related Tutorial Videos =
change to the right video

<youtube>0KGgYsEZcZM</youtube>


= Background =
text

image(s)
@@ Line 35: / Line 35: @@
 = A small Program in MicroPython =
 <syntaxhighlight lang="python" line='line'>
-import neopixel
+# todo
-from machine import Pin
+# code goes here
-from time import sleep
-# number of leds
-n=8
-# connected Pin
-p=0
-np = neopixel.NeoPixel(Pin(p),n)
-# colors the led at position in (r,g,b)
-def color(position, r,g,b):
-  np[position]=(r,g,b)
-  np.write()
-# remove all colors
-def clearAll():
-  for i in range(n):
-    color(i,0,0,0)
-# remove color from led at position
-def clear(position):
-  color(position,0,0,0)
-# the color (r,g,b) should run x times like a cycle
-def cycle(r,g,b,wait,x):
-  # before setting new colors, clear the ring
-  clearAll()
-  # the cycle should run x times
-  for j in range(x):
-    for i in range(n):
-      # clear the previous led
-      if(i==0):
-        clear(n-1)
-      else:
-        clear(i-1)
-      # color the current led
-      color(i,r,g,b)
-      # wait, color is displayed this time
-      sleep(wait)
-cycle(0,255,255,0.5,4)
 </syntaxhighlight>