1  # SPDX-FileCopyrightText: 2018 Limor Fried for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  from digitalio import DigitalInOut, Direction, Pull
 7  from adafruit_seesaw.seesaw import Seesaw
 8  from adafruit_seesaw.analoginput import AnalogInput
 9  from adafruit_seesaw.pwmout import PWMOut
10  from adafruit_motor import motor
11  from busio import I2C
12  import neopixel
13  import audioio
14  import audiocore
15  import board
16  
17  # Create seesaw object
18  i2c = I2C(board.SCL, board.SDA)
19  seesaw = Seesaw(i2c)
20  
21  # built in CPX button A
22  button = DigitalInOut(board.BUTTON_A)
23  button.direction = Direction.INPUT
24  button.pull = Pull.DOWN
25  
26  # NeoPixels
27  pixels = neopixel.NeoPixel(board.A1, 10, brightness=0)
28  pixels.fill((0,0,250))
29  
30  # Analog reading from Signal #1 (ss. #2)
31  foot_pedal = AnalogInput(seesaw, 2)
32  
33  # Create one motor on seesaw PWM pins 22 & 23
34  motor_a = motor.DCMotor(PWMOut(seesaw, 22), PWMOut(seesaw, 23))
35  motor_a.throttle = 0
36  
37  def map_range(x, in_min, in_max, out_min, out_max):
38      # Maps a number from one range to another.
39      mapped = (x-in_min) * (out_max - out_min) / (in_max-in_min) + out_min
40      if out_min <= out_max:
41          return max(min(mapped, out_max), out_min)
42      return min(max(mapped, out_max), out_min)
43  
44  # Get the audio file ready
45  wavfile = "unchained.wav"
46  f = open(wavfile, "rb")
47  wav = audiocore.WaveFile(f)
48  a = audioio.AudioOut(board.A0)
49  
50  time_to_play = 0  # when to start playing
51  played = False  # have we played audio already? only play once!
52  while True:
53      # Foot pedal ranges from about 700 (unpressed) to 50 (pressed)
54      # make that change the speed of the motor from 0 (stopped) to 0.5 (half)
55      press = foot_pedal.value
56      speed = map_range(press, 700, 50, 0, 0.5)
57      print("%d -> %0.3f" % (press, speed))
58      motor_a.throttle = speed
59  
60      if not time_to_play and speed > 0.1:
61          print("Start audio in 3 seconds")
62          time_to_play = time.monotonic() + 3
63      elif time_to_play and time.monotonic() > time_to_play and not played:
64          print("Playing audio")
65          a.play(wav)
66          played = True
67  
68      # turn on/off blue LEDs
69      if button.value:
70          if pixels.brightness < 0.1:
71              pixels.brightness = 1
72          else:
73              pixels.brightness = 0
74          time.sleep(0.5)
75  
76      # loop delay
77      time.sleep(0.1)