Gadgetoid · March 12, 2018 16:10 · Mar 12, 2018
diff --git a/midi.py b/midi.py
@@ -0,0 +1,76 @@
+import unicornhathd
+import time
+from threading import Thread
+import colorsys
+
+MIDI_NOTE_OFF = 0x80
+MIDI_NOTE_ON = 0x90
+MIDI_AFTERTOUCH = 0xA0
+MIDI_CC = 0xB0
+MIDI_PATCH = 0xC0
+MIDI_PRESSURE = 0xD0
+MIDI_PITCH = 0xE0
+
+hues = [0 for _ in range(8)]
+bars = [0 for _ in range(8)]
+pads = [0 for _ in range(8)]
+
+def display_update():
+    while running:
+        for x in range(16):
+            bar = x >> 1
+            hue = hues[bar]
+            r, g, b = [int(c * 255) for c in colorsys.hsv_to_rgb(hue, 1.0, 1.0)]
+            velocity = bars[bar] / 8.0
+            pad = pads[bar] / 8.0
+            for y in range(16):
+                if pad > y and x % 2 == 1:
+                    if int(pad) == y:
+                        br = pad - int(pad)
+                        unicornhathd.set_pixel(x,y,r * br, g * br, b * br)
+                    else:
+                        unicornhathd.set_pixel(x,y,r, g, b)
+                elif velocity > y and x % 2 == 0:
+                    if int(velocity) == y:
+                        br = velocity - int(velocity)
+                        unicornhathd.set_pixel(x,y,r * br, g * br, b * br)
+                    else:
+                        unicornhathd.set_pixel(x,y,r, g, b)
+                else:
+                    unicornhathd.set_pixel(x, y, 0, 0, 0)
+
+        unicornhathd.show()
+        time.sleep(1.0 / 60)
+        for bar in range(8):
+            if pads[bar] > 0:
+                pads[bar] -= 1
+
+running = True
+_t = Thread(target=display_update)
+_t.daemon = True
+_t.start()
+
+with open("/dev/midi1","rb") as midi:
+    while True:
+        command = midi.read(1)
+        command = ord(command)
+        if command == MIDI_NOTE_OFF:
+            key = ord(midi.read(1)) - 36
+            velocity = ord(midi.read(1))
+            print("NOTE OFF: {} {}".format(key, velocity))
+            continue
+        if command == MIDI_NOTE_ON:
+            key = ord(midi.read(1)) - 36
+            velocity = ord(midi.read(1))
+            pads[key] = velocity
+            print("NOTE ON: {} {}".format(key, velocity))
+            continue
+        if command == MIDI_CC:
+            cc = ord(midi.read(1))
+            value = ord(midi.read(1))
+            hues[cc - 1] = value / 127.0
+            bars[cc - 1] = value
+            print("CC: {} {}".format(cc, value))
+
+running = False
+_t.join()