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ws2812_server.py
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ws2812_server.py
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import asyncio
import websockets
import RPi.GPIO as GPIO
#import time
# Import the WS2812 module.
from neopixel import *
# Configure the count of pixels:
PIXEL_COUNT = 75 # Number of pixels
LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 10 # DMA channel to use for generating signal (try 10)
LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53
# Set the server port
PORT = 8000
# You can set DEBUG to True to receive logging on standard output.
#DEBUG = True
DEBUG = False
# Some WS2812 strips use GRB for the color order. Set the color order using COLOR_ORDER.
#COLOR_ORDER = "RGB"
COLOR_ORDER = "GRB"
async def socketHandler(websocket, path):
pixelCount=PIXEL_COUNT
try:
while True:
cmdLine = await websocket.recv()
cmdList = cmdLine.split(" ")
command = cmdList.pop(0)
if DEBUG:
print("> Received command:", cmdLine)
# Process the command
if command == "init":
# Initialize the led strip.
if DEBUG:
print(">> Initializing WS2812 strip...")
pixels = Adafruit_NeoPixel(PIXEL_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
pixels.begin()
# Clear all the pixels to turn them off.
if DEBUG:
print(">> Clearing all", PIXEL_COUNT, "pixels...")
for pix in range(pixels.numPixels()):
pixels.setPixelColor(pix,0)
pixels.show() # Make sure to call show() after changing any pixels!
# By default, we will automatically show what was sent. This can be overridden with the autoshow command.
autoShow = True
# The init command replies with the number of pixels on the strip.
await websocket.send(str(pixels.numPixels()))
elif command == "clear":
if DEBUG:
print(">> Handling clear command")
for pix in range(pixels.numPixels()):
pixels.setPixelColor(pix,0)
if autoShow:
pixels.show()
elif command == "setpixel":
if DEBUG:
print(">> Handling setpixel command")
pix = int(cmdList.pop(0))
red = int(cmdList.pop(0))
green = int(cmdList.pop(0))
blue = int(cmdList.pop(0))
if pixelCount < PIXEL_COUNT:
# Handle virtual split into multiple strips
while pix < PIXEL_COUNT:
if COLOR_ORDER == "RGB":
pixels.setPixelColorRGB(pix, red, green, blue)
else:
pixels.setPixelColorRGB(pix, green, red, blue)
pix = pix + pixelCount
else:
if COLOR_ORDER == "RGB":
pixels.setPixelColorRGB(pix, red, green,blue)
else:
pixels.setPixelColorRGB(pix, green, red, blue)
if autoShow:
pixels.show()
elif command == "setpixels":
if DEBUG:
print(">> Handling setpixels command")
red = int(cmdList.pop(0))
green = int(cmdList.pop(0))
blue = int(cmdList.pop(0))
for pix in range(pixels.numPixels()):
if COLOR_ORDER == "RGB":
pixels.setPixelColorRGB(pix, red, green,blue)
else:
pixels.setPixelColorRGB(pix, green, red, blue)
if autoShow:
pixels.show()
elif command == "shift":
if DEBUG:
print(">> Handling shift command")
direction=cmdList.pop(0)
if direction == "left":
if DEBUG:
print(">> Shifting left...")
leftmostPixelColor = pixels.getPixelColor(0)
if pixelCount < PIXEL_COUNT:
if DEBUG:
print(">>Handling virtual pixels for", pixelCount, "virtual pixels over",PIXEL_COUNT,"real pixels")
nrIterations = PIXEL_COUNT // pixelCount
for i in range(0, nrIterations):
for pix in range(1, pixelCount):
color = pixels.getPixelColor(i*pixelCount+pix)
pixels.setPixelColor(i*pixelCount+pix-1,color)
pixels.setPixelColor((i+1)*pixelCount-1,leftmostPixelColor)
if PIXEL_COUNT % pixelCount > 0:
i = 0
for pix in range(nrIterations*pixelCount,PIXEL_COUNT):
color = pixels.getPixelColor(i)
pixels.setPixelColor(pix,color)
i = i + 1
else:
for pix in range(1, pixels.numPixels()):
color = pixels.getPixelColor(pix)
pixels.setPixelColor(pix-1,color)
pixels.setPixelColor(pixels.numPixels()-1,leftmostPixelColor)
if autoShow:
pixels.show()
elif direction == "right":
if DEBUG:
print(">> Shifting right...")
rightmostPixelColor = pixels.getPixelColor(pixelCount-1)
if pixelCount < PIXEL_COUNT:
if DEBUG:
print(">>Handling virtual pixels for", pixelCount, "virtual pixels over",PIXEL_COUNT,"real pixels")
nrIterations = PIXEL_COUNT // pixelCount
if PIXEL_COUNT % pixelCount > 0:
for pix in reversed(range(nrIterations*pixelCount,PIXEL_COUNT)):
color = pixels.getPixelColor(pix-1)
pixels.setPixelColor(pix,color)
for i in range(0, nrIterations):
for pix in reversed(range(1, pixelCount)):
color = pixels.getPixelColor(i*pixelCount+pix-1)
pixels.setPixelColor(i*pixelCount+pix,color)
pixels.setPixelColor(i*pixelCount,rightmostPixelColor)
else:
for pix in reversed(range(1,pixels.numPixels())):
color = pixels.getPixelColor(pix-1)
pixels.setPixelColor(pix,color)
pixels.setPixelColor(0,rightmostPixelColor)
if autoShow:
pixels.show()
else:
print(">> Unknown shift direction:", direction)
elif command == "dim":
if DEBUG:
print(">> Handling dim command")
step = int(cmdList.pop(0))
for i in range(pixels.numPixels()):
color = pixels.getPixelColor(i)
red = (color >> 16) & 0xFF
green = (color >> 8) & 0xFF
blue = color & 0xFF
red = int(max(0, red - step))
green = int(max(0, green - step))
blue = int(max(0, blue - step))
pixels.setPixelColorRGB(i,red,green,blue)
if autoShow:
pixels.show()
elif command == "autoshow":
if DEBUG:
print(">> Handling autoshow command")
state = cmdList.pop(0)
if state == "on":
autoShow = True
elif state == "off":
autoShow = False
else:
print(">> Unknown state for autoshow:", state)
elif command == "show":
if DEBUG:
print(">> Handling show command")
pixels.show()
elif command == "getpixelcount":
if DEBUG:
print(">> Handling getpixelcount command")
print(">> Returning pixel count", pixels.numPixels())
await websocket.send(str(pixels.numPixels()))
elif command == "setVirtualPixels":
if DEBUG:
print(">> Handling setVirtualPixels")
nrPixels = int(cmdList.pop(0))
pixelCount = nrPixels
else:
print(">> Unknown command:", command)
except websockets.exceptions.ConnectionClosed:
if DEBUG:
print("> Disconnected.")
except:
print("> Unknown exception encountered.")
raise
print("WS2812 server starting...")
start_server = websockets.serve(socketHandler, '0.0.0.0', PORT)
print("> Websocket initialized. Now entering main loop...")
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()