server-rack-led/main.py

import time
import requests
from rpi_ws281x import *
import RPi.GPIO as GPIO
import os

# LED strip configuration:
LED_COUNT      = 60      # Number of LED pixels.
LED_PIN        = 18      # GPIO pin connected to the pixels (18 uses PWM!).
#LED_PIN        = 10      # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
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_power = True

try:
    with open('./idle.txt', 'r') as f:
        idle_mode = f.readline()
except:
    with open('./idle.txt', 'w') as f:
        f.write('1')
        idle_mode = 1

def check_internet(url='http://www.google.com/', timeout=5):
    try:
        _ = requests.head(url, timeout=timeout)
        return True
    except requests.ConnectionError:
        return False

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=10, iterations=10):
    """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))
        strip.show()
        time.sleep(wait_ms/1000.0)
    
def setColor(strip, color, iterations=10, wait_ms=10):
    for i in range(strip.numPixels()):
        strip.setPixelColor(i, color)
    strip.show()
    time.sleep(wait_ms/1000.0)

def blink(strip, color1, color2, iterations=10, wait_ms=10):
    for i in range(strip.numPixels()):
        strip.setPixelColor(i, color1)
    strip.show()
    time.sleep(1)
    for i in range(strip.numPixels()):
        strip.setPixelColor(i, color2)
    strip.show()
    time.sleep(1)

def led_power_toggle():
    global led_power
    if led_power == True:
        led_power = False
    else:
        led_power = True

def read_idle():
    with open('./idle.txt', 'r') as f:
        idle_mode = f.readline()

def change_idle_mode():
    with open('./idle.txt', 'w') as f:
        f.write(int(idle_mode) + 1)

if __name__ == '__main__':
    strip = Adafruit_NeoPixel(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
    strip.begin()
    GPIO.setmode(GPIO.BCM)

    GPIO.setup(13, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(19, GPIO.IN, pull_up_down=GPIO.PUD_UP)

    GPIO.add_event_detect(13, GPIO.BOTH, callback=led_power_toggle(), bouncetime=300)
    GPIO.add_event_detect(19, GPIO.BOTH, callback=change_idle_mode(), bouncetime=300) 

    try:
        while True:

            try:
                with open('./idle.txt', 'r') as f:
                        idle_mode = f.readline()
            except:
                with open('./idle.txt', 'w') as f:
                    f.write('1')
                with open('./idle.txt', 'r') as f:
                    idle_mode = f.readline()

            if led_power == False:
                setColor(strip, Color(0,0,0))
            else:
                if check_internet() == False:
                    blink(strip, Color(255,0,0), Color(255,255,255))
                else:
                    if idle_mode == '1':
                        rainbowCycle(strip)
                    elif idle_mode == '2':
                        setColor(strip, Color(255,0,0))
                    elif idle_mode == '3':
                        setColor(strip, Color(0,255,0))
                    elif idle_mode == '4':
                        setColor(strip, Color(0,0,255))
                    elif idle_mode == '5':
                        setColor(strip, Color(125,245,255))
                    else:
                        blink(strip, Color(255,0,0), Color(0,0,0))

    except KeyboardInterrupt:
        setColor(strip, Color(0,0,0))