Initial code commit

This program demonstrates playing each note and then hammers out a very simple tune to show the basics of using the xylophone. True music will have a key strike for a time then a defined rest between keys, or even play a couple keys at the same time. The true musical part is up to you. This uses Grand Central pins D2-D9 (8 solenoids) but you can do many more with the right circuit and a bit more amperage to make sure.

Grand_Central_Robot_Xylophone/code.py

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+# Adafruit Grand Central Robot Xylophone Demo Program
+# Dano Wall and Mike Barela for Adafruit Industries
+# MIT License
+
+import time
+import board
+from digitalio import DigitalInOut, Direction
+
+solenoid_count = 8  # Set the total number of solenoids used
+start_pin = 2       # Start at pin D2
+
+# Create the input objects list for solenoids
+solenoid = []
+for k in range(start_pin, solenoid_count + start_pin + 1):
+    # get pin # attribute, use string formatting
+    this_solenoid = DigitalInOut(getattr(board, "D{}".format(k)))
+    this_solenoid.direction = Direction.OUTPUT
+    solenoid.append(this_solenoid)
+
+STRIKE_TIME = 0.01  # Time between initiating a strike and turning it off
+TIME_BETWEEN = 0.5  # Time between actions in seconds
+
+song = [4, 3, 2, 3, 4, 4, 4, 3, 3, 3, 4, 4, 4, 4, 3, 2, 3, 4, 4, 4, 5, 5, 4, 3, 2]
+
+def play(key, time_to_strike):
+    solenoid[key].value = True
+    time.sleep(time_to_strike)
+    solenoid[key].value = False
+
+def rest(time_to_wait):
+    time.sleep(time_to_wait)
+
+while True:
+    # Play each of the bars
+    for bar in range(solenoid_count):
+        play(bar, STRIKE_TIME)
+        rest(TIME_BETWEEN)
+
+    time.sleep(1.0)  # Wait a bit before playing the song
+
+    # Play the notes defined in song
+    # simple example does not vary time between notes
+    for bar in range(len(song)):
+        play(song[bar], STRIKE_TIME)
+        rest(TIME_BETWEEN)
+
+    time.sleep(1.0)