First commit

raspi-color.py

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+#!/usr/bin/env python3
+# rpi_ws281x library strandtest example
+# Initial author: Tony DiCola (tony@tonydicola.com)
+# Author: Damien Broqua (contact@darkou.fr)
+
+import time
+from rpi_ws281x import *
+import argparse
+import RPi.GPIO as GPIO
+
+# LED strip configuration:
+LED_COUNT       = 60      # Number of LED 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
+
+LED_DISPLAY     = True
+BUTTON          = 16
+
+
+def handlePushButton(button):
+    global LED_DISPLAY
+    LED_DISPLAY = not LED_DISPLAY
+    print ('Pushed !')
+
+# Define functions which animate LEDs in various ways.
+def colorWipe(strip, color, wait_ms=50):
+    """Wipe color across display a pixel at a time."""
+    for i in range(strip.numPixels()):
+        strip.setPixelColor(i, color)
+        strip.show()
+        time.sleep(wait_ms/1000.0)
+
+def wheel(pos):
+    """Generate rainbow colors across 0-255 positions."""
+    if pos < 85:
+        return Color(pos * 3, 255 - pos * 3, 0)
+    elif pos < 170:
+        pos -= 85
+        return Color(255 - pos * 3, 0, pos * 3)
+    else:
+        pos -= 170
+        return Color(0, pos * 3, 255 - pos * 3)
+
+def rainbowCycle(strip, wait_ms=20, iterations=5):
+    """Draw rainbow that uniformly distributes itself across all pixels."""
+    for j in range(256*iterations):
+        for i in range(strip.numPixels()):
+            strip.setPixelColor(i, wheel((int(i * 256 / strip.numPixels()) + j) & 255))
+            if LED_DISPLAY == False:
+                break
+        strip.show()
+        time.sleep(wait_ms/1000.0)
+        if LED_DISPLAY == False:
+            break
+
+# Main program logic follows:
+if __name__ == '__main__':
+    global BUTTON
+    # Process arguments
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-c', '--clear', action='store_true', help='clear the display on exit')
+    args = parser.parse_args()
+
+    # Create NeoPixel object with appropriate configuration.
+    strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
+    # Intialize the library (must be called once before other functions).
+    strip.begin()
+
+    GPIO.setmode(GPIO.BOARD)
+    GPIO.setup(BUTTON, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+    GPIO.add_event_detect(BUTTON, GPIO.FALLING, callback=handlePushButton, bouncetime=250)
+
+    print ('Press Ctrl-C to quit.')
+    if not args.clear:
+        print('Use "-c" argument to clear LEDs on exit')
+
+    try:
+
+        while True:
+            if LED_DISPLAY == True:
+                rainbowCycle(strip)
+            else:
+                colorWipe(strip, Color(0,0,0), 10)
+
+    except KeyboardInterrupt:
+        if args.clear:
+            print("Done")
+            colorWipe(strip, Color(0,0,0), 10)

raspi-color.service

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+[Unit]
+Description=RGB leds
+After=
+
+[Service]
+Type=simple
+User=root
+Group=root
+UMask=007
+WorkingDirectory=/home/pi/
+ExecStart=python3 /home/pi/raspi-color.py
+Restart=on-failure
+TimeoutStopSec=300
+
+[Install]
+WantedBy=multi-user.target