1  # SPDX-FileCopyrightText: 2018 phillip torrone for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  import array
 7  import math
 8  from busio import I2C
 9  from adafruit_seesaw.seesaw import Seesaw
10  from adafruit_seesaw.pwmout import PWMOut
11  from adafruit_motor import motor
12  import audiobusio
13  import board
14  
15  print("Sound sensor motor!")
16  
17  # Create seesaw object
18  i2c = I2C(board.SCL, board.SDA)
19  seesaw = Seesaw(i2c)
20  
21  # Create one motor on seesaw PWM pins 22 & 23
22  motor_a = motor.DCMotor(PWMOut(seesaw, 22), PWMOut(seesaw, 23))
23  motor_a.throttle = 0 # motor is stopped
24  
25  
26  ##################### helpers
27  
28  # Maps a number from one range to another.
29  def map_range(x, in_min, in_max, out_min, out_max):
30      mapped = (x-in_min) * (out_max - out_min) / (in_max-in_min) + out_min
31      if out_min <= out_max:
32          return max(min(mapped, out_max), out_min)
33      return min(max(mapped, out_max), out_min)
34  
35  # Returns the average
36  def mean(values):
37      return sum(values) / len(values)
38  
39  # Audio root-mean-square
40  def normalized_rms(values):
41      minbuf = int(mean(values))
42      return math.sqrt(sum(float(sample-minbuf)*(sample-minbuf) for sample in values) / len(values))
43  
44  
45  # Our microphone
46  mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
47                         sample_rate=16000, bit_depth = 16)
48  samples = array.array('H', [0] * 200)
49  mic.record(samples, len(samples))
50  
51  while True:
52      mic.record(samples, len(samples))
53      magnitude = normalized_rms(samples)
54      print(((magnitude),))
55      motor_a.throttle = map_range(magnitude, 90, 200, 0, 1.0)
56      time.sleep(0.1)