1  # SPDX-FileCopyrightText: 2020 John Edgar Park for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  # Magic Light Bulb remote color mixer
 6  # Sends RGB color values, read from three faders on CPB to the bulb
 7  # https://www.magiclightbulbs.com/collections/bluetooth-bulbs
 8  
 9  import adafruit_ble
10  from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
11  from adafruit_ble_magic_light import MagicLightService
12  import _bleio
13  import board
14  from analogio import AnalogIn
15  from adafruit_circuitplayground import cp
16  
17  
18  def find_connection():
19      for connection in radio.connections:
20          if MagicLightService not in connection:  # Filter services
21              continue
22          return connection, connection[MagicLightService]
23      return None, None
24  
25  radio = adafruit_ble.BLERadio()
26  
27  
28  def scale(value):
29      # Scale a value from 0-65535 (AnalogIn range) to 0-255 (RGB range)
30      return int(value / 65535 * 255)
31  a4 = AnalogIn(board.A4)  # red slider
32  a5 = AnalogIn(board.A5)  # green slider
33  a6 = AnalogIn(board.A6)  # blue slider
34  
35  cp.pixels.brightness = 0.1
36  dimmer = 1.0
37  
38  active_connection, bulb = find_connection()  # In case already connected
39  
40  while True:
41      if not active_connection:  # There's no connection, so let's scan for one
42          cp.pixels[0] = (60, 40, 0)  # set CPB NeoPixel 0 to yellow while searching
43          print("Scanning for Magic Light...")
44          # Scan and filter for advertisements with ProvideServicesAdvertiesment type
45          for advertisement in radio.start_scan(ProvideServicesAdvertisement):
46              # Filter further for advertisements with MagicLightService
47              if MagicLightService in advertisement.services:
48                  active_connection = radio.connect(advertisement)
49                  print("Connected to Magic Light")
50                  cp.pixels[0] = (0, 0, 255)  # Set NeoPixel 0 to blue when connected
51                  # Play a happy tone
52                  cp.play_tone(440, 0.1)
53                  cp.play_tone(880, 0.1)
54                  print("Adjust slide potentiometers to mix RGB colors")
55                  try:
56                      bulb = active_connection[MagicLightService]
57                  except _bleio.ConnectionError:
58                      print("disconnected")
59                      continue
60                  break
61          radio.stop_scan()  # Now that we're connected, stop scanning
62  
63      while active_connection.connected:  # Connected, now we can set attrs to change colors
64          # Toggle slide switch to go to half or full brightness
65          if cp.switch:
66              cp.red_led = True
67              dimmer = 0.5
68          else:
69              cp.red_led = False
70              dimmer = 1.0
71  
72          # Press the 'A' button to momentarily black the bulb
73          if cp.button_a:
74              dimmer = 0.0
75  
76          r = scale(a4.value * dimmer)
77          g = scale(a5.value * dimmer)
78          b = scale(a6.value * dimmer)
79  
80          # Press the 'B' button to momentarily white the bulb
81          if cp.button_b:
82              r, g, b = (255, 255, 255)
83  
84          color = (r, g, b)
85  
86          try:
87              bulb[0] = color  # Send color to bulb's color characteristic
88          except _bleio.ConnectionError:
89              print("disconnected")
90              continue
91          cp.pixels[2] = (r, 0, 0)
92          cp.pixels[3] = (0, g, 0)
93          cp.pixels[4] = (0, 0, b)
94          cp.pixels[7] = (color)
95  
96      active_connection = None  # Not connected, start scanning again
97      cp.pixels[0] = (60, 40, 0)