1  # Simple demo of reading the MMA8451 orientation every second.
 2  # Author: Tony DiCola
 3  import time
 4  
 5  import board
 6  import busio
 7  
 8  import adafruit_mma8451
 9  
10  
11  # Initialize I2C bus.
12  i2c = busio.I2C(board.SCL, board.SDA)
13  
14  # Initialize MMA8451 module.
15  sensor = adafruit_mma8451.MMA8451(i2c)
16  # Optionally change the address if it's not the default:
17  #sensor = adafruit_mma8451.MMA8451(i2c, address=0x1C)
18  
19  # Optionally change the range from its default of +/-4G:
20  #sensor.range = adafruit_mma8451.RANGE_2G  # +/- 2G
21  #sensor.range = adafruit_mma8451.RANGE_4G  # +/- 4G (default)
22  #sensor.range = adafruit_mma8451.RANGE_8G  # +/- 8G
23  
24  # Optionally change the data rate from its default of 800hz:
25  #sensor.data_rate = adafruit_mma8451.DATARATE_800HZ  #  800Hz (default)
26  #sensor.data_rate = adafruit_mma8451.DATARATE_400HZ  #  400Hz
27  #sensor.data_rate = adafruit_mma8451.DATARATE_200HZ  #  200Hz
28  #sensor.data_rate = adafruit_mma8451.DATARATE_100HZ  #  100Hz
29  #sensor.data_rate = adafruit_mma8451.DATARATE_50HZ   #   50Hz
30  #sensor.data_rate = adafruit_mma8451.DATARATE_12_5HZ # 12.5Hz
31  #sensor.data_rate = adafruit_mma8451.DATARATE_6_25HZ # 6.25Hz
32  #sensor.data_rate = adafruit_mma8451.DATARATE_1_56HZ # 1.56Hz
33  
34  # Main loop to print the acceleration and orientation every second.
35  while True:
36      x, y, z = sensor.acceleration
37      print('Acceleration: x={0:0.3f}m/s^2 y={1:0.3f}m/s^2 z={2:0.3f}m/s^2'.format(x, y, z))
38      orientation = sensor.orientation
39      # Orientation is one of these values:
40      #  - PL_PUF: Portrait, up, front
41      #  - PL_PUB: Portrait, up, back
42      #  - PL_PDF: Portrait, down, front
43      #  - PL_PDB: Portrait, down, back
44      #  - PL_LRF: Landscape, right, front
45      #  - PL_LRB: Landscape, right, back
46      #  - PL_LLF: Landscape, left, front
47      #  - PL_LLB: Landscape, left, back
48      print('Orientation: ', end='')
49      if orientation == adafruit_mma8451.PL_PUF:
50          print('Portrait, up, front')
51      elif orientation == adafruit_mma8451.PL_PUB:
52          print('Portrait, up, back')
53      elif orientation == adafruit_mma8451.PL_PDF:
54          print('Portrait, down, front')
55      elif orientation == adafruit_mma8451.PL_PDB:
56          print('Portrait, down, back')
57      elif orientation == adafruit_mma8451.PL_LRF:
58          print('Landscape, right, front')
59      elif orientation == adafruit_mma8451.PL_LRB:
60          print('Landscape, right, back')
61      elif orientation == adafruit_mma8451.PL_LLF:
62          print('Landscape, left, front')
63      elif orientation == adafruit_mma8451.PL_LLB:
64          print('Landscape, left, back')
65      time.sleep(1.0)