1  """
 2  Read cycling speed and cadence data from a peripheral using the standard BLE
 3  Cycling Speed and Cadence (CSC) Service.
 4  """
 5  
 6  import time
 7  
 8  import adafruit_ble
 9  from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
10  from adafruit_ble.services.standard.device_info import DeviceInfoService
11  from adafruit_ble_cycling_speed_and_cadence import CyclingSpeedAndCadenceService
12  
13  # PyLint can't find BLERadio for some reason so special case it here.
14  ble = adafruit_ble.BLERadio()  # pylint: disable=no-member
15  
16  
17  while True:
18      print("Scanning...")
19      # Save advertisements, indexed by address
20      advs = {}
21      for adv in ble.start_scan(ProvideServicesAdvertisement, timeout=5):
22          if CyclingSpeedAndCadenceService in adv.services:
23              print("found a CyclingSpeedAndCadenceService advertisement")
24              # Save advertisement. Overwrite duplicates from same address (device).
25              advs[adv.address] = adv
26  
27      ble.stop_scan()
28      print("Stopped scanning")
29      if not advs:
30          # Nothing found. Go back and keep looking.
31          continue
32  
33      # Connect to all available CSC sensors.
34      cyc_connections = []
35      for adv in advs.values():
36          cyc_connections.append(ble.connect(adv))
37          print("Connected", len(cyc_connections))
38  
39      # Print out info about each sensors.
40      for conn in cyc_connections:
41          if conn.connected:
42              if DeviceInfoService in conn:
43                  dis = conn[DeviceInfoService]
44                  try:
45                      manufacturer = dis.manufacturer
46                  except AttributeError:
47                      manufacturer = "(Manufacturer Not specified)"
48                  print("Device:", manufacturer)
49              else:
50                  print("No device information")
51  
52      print("Waiting for data... (could be 10-20 seconds or more)")
53      # Get CSC Service from each sensor.
54      cyc_services = []
55      for conn in cyc_connections:
56  
57          cyc_services.append(conn[CyclingSpeedAndCadenceService])
58  
59      # Read data from each sensor once a second.
60      # Stop if we lose connection to all sensors.
61      while True:
62          still_connected = False
63          for conn, svc in zip(cyc_connections, cyc_services):
64              if conn.connected:
65                  still_connected = True
66                  print(svc.measurement_values)
67  
68          if not still_connected:
69              break
70          time.sleep(1)