1  # SPDX-FileCopyrightText: 2020 Carter Nelson for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  import board
 7  import adafruit_lsm6ds.lsm6ds33
 8  from adafruit_ht16k33 import matrix
 9  import matrixsand
10  
11  DELAY = 0.05 # overall update rate
12  
13  # the accelo
14  accelo = adafruit_lsm6ds.lsm6ds33.LSM6DS33(board.I2C())
15  
16  # the matrices
17  m1 = matrix.Matrix8x8(board.I2C(), 0x70)
18  m2 = matrix.Matrix8x8(board.I2C(), 0x71)
19  
20  # the sand
21  sand1 = matrixsand.MatrixSand(8, 8)
22  sand2 = matrixsand.MatrixSand(8, 8)
23  
24  # simple helper
25  def update_matrix(m, s):
26      for x in range(8):
27          for y in range(8):
28              m[x,y] = s[x,y]
29  
30  # fill up some sand
31  for sx in range(8):
32      for sy in range(8):
33          sand1[sx, sy] = True
34  sand1[0,0] = sand1[0,1] = sand1[1,0] = False
35  sand1[0,2] = sand1[1,1] = sand1[2,0] = False
36  
37  update_matrix(m1, sand1)
38  update_matrix(m2, sand2)
39  
40  updated1 = updated2 = False
41  
42  while True:
43      # read accelo
44      ax, ay, az = accelo.acceleration
45      # rotate coords
46      xx = -ax - ay
47      yy = -ax + ay
48      zz = az
49  
50      # move grain of sand from upper to lower?
51      if yy > 0 and sand1[7,7] and not sand2[0,0] and not updated2:
52          sand1[7,7] = False
53          sand2[0,0] = True
54          updated1 = updated2 = True
55      # move grain of sand from lower to upper?
56      elif yy <= 0 and sand2[0,0] and not sand1[7,7] and not updated1:
57          sand2[0,0] = False
58          sand1[7,7] = True
59          updated1 = updated2 = True
60      # nope, just a regular update
61      else:
62          updated1 = sand1.iterate((xx, yy, zz))
63          updated2 = sand2.iterate((xx, yy, zz))
64  
65      # update matrices if needed
66      if updated1:
67          update_matrix(m1, sand1)
68      if updated2:
69          update_matrix(m2, sand2)
70  
71      time.sleep(DELAY)