1  import time
 2  
 3  from board import SCL, SDA
 4  import busio
 5  from adafruit_neotrellis.neotrellis import NeoTrellis
 6  from adafruit_neotrellis.multitrellis import MultiTrellis
 7  
 8  # create the i2c object for the trellis
 9  i2c_bus = busio.I2C(SCL, SDA)
10  
11  """create the trellis. This is for a 2x2 array of NeoTrellis boards
12  for a 2x1 array (2 boards connected left to right) you would use:
13  
14  trelli = [
15      [NeoTrellis(i2c_bus, False, addr=0x2E), NeoTrellis(i2c_bus, False, addr=0x2F)]
16      ]
17  
18  """
19  trelli = [
20      [NeoTrellis(i2c_bus, False, addr=0x2E), NeoTrellis(i2c_bus, False, addr=0x2F)],
21      [NeoTrellis(i2c_bus, False, addr=0x30), NeoTrellis(i2c_bus, False, addr=0x31)],
22  ]
23  
24  trellis = MultiTrellis(trelli)
25  
26  # some color definitions
27  OFF = (0, 0, 0)
28  RED = (255, 0, 0)
29  YELLOW = (255, 150, 0)
30  GREEN = (0, 255, 0)
31  CYAN = (0, 255, 255)
32  BLUE = (0, 0, 255)
33  PURPLE = (180, 0, 255)
34  
35  # this will be called when button events are received
36  def blink(xcoord, ycoord, edge):
37      # turn the LED on when a rising edge is detected
38      if edge == NeoTrellis.EDGE_RISING:
39          trellis.color(xcoord, ycoord, BLUE)
40      # turn the LED off when a rising edge is detected
41      elif edge == NeoTrellis.EDGE_FALLING:
42          trellis.color(xcoord, ycoord, OFF)
43  
44  
45  for y in range(8):
46      for x in range(8):
47          # activate rising edge events on all keys
48          trellis.activate_key(x, y, NeoTrellis.EDGE_RISING)
49          # activate falling edge events on all keys
50          trellis.activate_key(x, y, NeoTrellis.EDGE_FALLING)
51          trellis.set_callback(x, y, blink)
52          trellis.color(x, y, PURPLE)
53          time.sleep(0.05)
54  
55  for y in range(8):
56      for x in range(8):
57          trellis.color(x, y, OFF)
58          time.sleep(0.05)
59  
60  while True:
61      # the trellis can only be read every 17 millisecons or so
62      trellis.sync()
63      time.sleep(0.02)