1  # SPDX-FileCopyrightText: 2019 Dano Wall for Adafruit Industries
 2  # SPDX-FileCopyrightText: 2019 Anne Barela for Adafruit Industries
 3  #
 4  # SPDX-License-Identifier: MIT
 5  
 6  # Adafruit Grand Central Robot Xylophone Demo Program
 7  # Dano Wall and Anne Barela for Adafruit Industries
 8  # MIT License
 9  
10  import time
11  import board
12  from digitalio import DigitalInOut, Direction
13  
14  solenoid_count = 8  # Set the total number of solenoids used
15  start_pin = 2       # Start at pin D2
16  
17  # Create the input objects list for solenoids
18  solenoid = []
19  for k in range(start_pin, solenoid_count + start_pin + 1):
20      # get pin # attribute, use string formatting
21      this_solenoid = DigitalInOut(getattr(board, "D{}".format(k)))
22      this_solenoid.direction = Direction.OUTPUT
23      solenoid.append(this_solenoid)
24  
25  STRIKE_TIME = 0.01  # Time between initiating a strike and turning it off
26  TIME_BETWEEN = 0.5  # Time between actions in seconds
27  
28  song = [3, 4, 5, 4, 3, 3, 3, 4, 4, 4, 3, 3, 3, 3, 4, 5, 4, 3, 3, 3, 2, 2, 3, 4, 5]
29  
30  def play(key, time_to_strike):
31      solenoid[key].value = True
32      time.sleep(time_to_strike)
33      solenoid[key].value = False
34  
35  def rest(time_to_wait):
36      time.sleep(time_to_wait)
37  
38  while True:
39      # Play each of the bars
40      for bar in range(solenoid_count):
41          play(bar, STRIKE_TIME)
42          rest(TIME_BETWEEN)
43  
44      time.sleep(1.0)  # Wait a bit before playing the song
45  
46      # Play the notes defined in song
47      # simple example does not vary time between notes
48      for bar in range(len(song)):
49          play(song[bar], STRIKE_TIME)
50          rest(TIME_BETWEEN)
51  
52      time.sleep(1.0)