1  # SPDX-FileCopyrightText: 2019 Anne Barela for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import board
 6  import pulseio
 7  import adafruit_irremote
 8  
 9  IR_PIN = board.D2  # Pin connected to IR receiver.
10  
11  # Expected pulse, pasted in from previous recording REPL session:
12  pulse = [9144, 4480, 602, 535, 600, 540, 595, 536, 599, 537, 600, 536,
13           596, 540, 595, 544, 591, 539, 596, 1668, 592, 1676, 593, 1667,
14           593, 1674, 596, 1670, 590, 1674, 595, 535, 590, 1673, 597, 541,
15           595, 536, 597, 538, 597, 538, 597, 1666, 594, 541, 594, 541, 594,
16           540, 595, 1668, 596, 1673, 592, 1668, 592, 1672, 601, 540, 592,
17           1669, 590, 1672, 598, 1667, 593]
18  
19  print('IR listener')
20  # Fuzzy pulse comparison function:
21  def fuzzy_pulse_compare(pulse1, pulse2, fuzzyness=0.2):
22      if len(pulse1) != len(pulse2):
23          return False
24      for i in range(len(pulse1)):
25          threshold = int(pulse1[i] * fuzzyness)
26          if abs(pulse1[i] - pulse2[i]) > threshold:
27              return False
28      return True
29  
30  # Create pulse input and IR decoder.
31  pulses = pulseio.PulseIn(IR_PIN, maxlen=200, idle_state=True)
32  decoder = adafruit_irremote.GenericDecode()
33  pulses.clear()
34  pulses.resume()
35  # Loop waiting to receive pulses.
36  while True:
37      # Wait for a pulse to be detected.
38      detected = decoder.read_pulses(pulses)
39      print('got a pulse...')
40      # Got a pulse, now compare.
41      if fuzzy_pulse_compare(pulse, detected):
42          print('Received correct remote control press!')