Merge pull request adafruit#1198 from adafruit/robot_drummer

Adding code for MIDI Solenoid Drum Kit

Author: TheKitty

MIDI_Solenoid_Drum_Kit/code.py

@@ -0,0 +1,53 @@
+import time
+import board
+import digitalio
+import usb_midi
+import adafruit_midi
+from adafruit_midi.note_on import NoteOn
+
+#  pins for the solenoid output signals
+noid_pins = [board.D5, board.D6, board.D9, board.D10]
+
+#  array for the solenoids
+noids = []
+
+#  setup for the solenoid pins to be outputs
+for pin in noid_pins:
+    noid = digitalio.DigitalInOut(pin)
+    noid.direction = digitalio.Direction.OUTPUT
+    noids.append(noid)
+
+#  MIDI note array
+notes = [60, 61, 62, 63]
+
+#  MIDI in setup
+midi = adafruit_midi.MIDI(midi_in=usb_midi.ports[0], in_channel=0)
+
+#  delay for solenoids
+speed = 0.03
+retract = 0
+
+while True:
+
+    #  msg holds MIDI messages
+    msg = midi.receive()
+
+    for i in range(4):
+        #  states for solenoid on/off
+        noid_output = noids[i]
+
+        #  states for MIDI note recieved
+        notes_played = notes[i]
+
+        #  if NoteOn msg comes in and the MIDI note # matches with predefined notes:
+        if isinstance(msg, NoteOn) and msg.note is notes_played:
+            print(time.monotonic(), msg.note)
+
+            #  solenoid is triggered
+            noid_output.value = True
+            #  quick delay
+            retract = time.monotonic()
+
+        #  retracts solenoid using time.monotonic() to avoid delays between notes activating
+        if (retract + speed) < time.monotonic():
+            noid_output.value = False