1  import time
 2  import board
 3  import busio
 4  import adafruit_pca9685
 5  import adafruit_rgbled
 6  
 7  # PCA9685 Initialization
 8  i2c = busio.I2C(board.SCL, board.SDA)
 9  pca = adafruit_pca9685.PCA9685(i2c)
10  pca.frequency = 60
11  
12  # PCA9685 LED Channels
13  RED_LED = pca.channels[0]
14  GREEN_LED = pca.channels[1]
15  BLUE_LED = pca.channels[2]
16  
17  # Create the RGB LED object
18  led = adafruit_rgbled.RGBLED(RED_LED, GREEN_LED, BLUE_LED, invert_pwm=True)
19  
20  # Optionally, you can also create the RGB LED object with inverted PWM
21  # led = adafruit_rgbled.RGBLED(RED_LED, GREEN_LED, BLUE_LED, invert_pwm=True)
22  
23  
24  def wheel(pos):
25      # Input a value 0 to 255 to get a color value.
26      # The colours are a transition r - g - b - back to r.
27      if pos < 0 or pos > 255:
28          return 0, 0, 0
29      if pos < 85:
30          return int(255 - pos * 3), int(pos * 3), 0
31      if pos < 170:
32          pos -= 85
33          return 0, int(255 - pos * 3), int(pos * 3)
34      pos -= 170
35      return int(pos * 3), 0, int(255 - (pos * 3))
36  
37  
38  def rainbow_cycle(wait):
39      for i in range(255):
40          i = (i + 1) % 256
41          led.color = wheel(i)
42          time.sleep(wait)
43  
44  
45  while True:
46      # setting RGB LED color to RGB Tuples (R, G, B)
47      print("setting color 1")
48      led.color = (255, 0, 0)
49      time.sleep(1)
50  
51      print("setting color 2")
52      led.color = (0, 255, 0)
53      time.sleep(1)
54  
55      print("setting color 3")
56      led.color = (0, 0, 255)
57      time.sleep(1)
58  
59      # setting RGB LED color to 24-bit integer values
60      led.color = 0xFF0000
61      time.sleep(1)
62  
63      led.color = 0x00FF00
64      time.sleep(1)
65  
66      led.color = 0x0000FF
67      time.sleep(1)
68  
69      # rainbow cycle the RGB LED
70      rainbow_cycle(0.01)