Editing LED Ring NeoPixel

= Description =
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= How to connect it electrically =
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= 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>

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= Related Tutorial Videos =
change to the right video

<youtube>0KGgYsEZcZM</youtube>


= Background =
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 = 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.
+Text
-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).
+Image(s)
-[[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.
+Text
-[[File:Neopixel3.PNG|400px]]
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-[[File:LedRing.PNG|x400px]]
-[[File:RingSetup.jpg|x400px]]
 = How to control it in MicroPython =
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 = 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>
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+image(s)
 = Related Tutorial Videos =