1  import random
  2  import time
  3  import board
  4  import busio
  5  from digitalio import DigitalInOut
  6  import neopixel
  7  from adafruit_esp32spi import adafruit_esp32spi, adafruit_esp32spi_wifimanager
  8  import adafruit_esp32spi.adafruit_esp32spi_socket as socket
  9  from adafruit_ntp import NTP
 10  
 11  # Get wifi details and more from a secrets.py file
 12  try:
 13      from secrets import secrets
 14  except ImportError:
 15      print("WiFi secrets are kept in secrets.py, please add them there!")
 16      raise
 17  
 18  # ESP32 Setup
 19  try:
 20      esp32_cs = DigitalInOut(board.ESP_CS)
 21      esp32_ready = DigitalInOut(board.ESP_BUSY)
 22      esp32_reset = DigitalInOut(board.ESP_RESET)
 23  except AttributeError:
 24      esp32_cs = DigitalInOut(board.D13)
 25      esp32_ready = DigitalInOut(board.D11)
 26      esp32_reset = DigitalInOut(board.D12)
 27  
 28  spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
 29  esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)
 30  
 31  """Use below for Most Boards"""
 32  status_light = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.2)  # Uncomment for Most Boards
 33  """Uncomment below for ItsyBitsy M4"""
 34  # status_light = dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)
 35  # Uncomment below for an externally defined RGB LED
 36  # import adafruit_rgbled
 37  # from adafruit_esp32spi import PWMOut
 38  # RED_LED = PWMOut.PWMOut(esp, 26)
 39  # GREEN_LED = PWMOut.PWMOut(esp, 27)
 40  # BLUE_LED = PWMOut.PWMOut(esp, 25)
 41  # status_light = adafruit_rgbled.RGBLED(RED_LED, BLUE_LED, GREEN_LED)
 42  wifi = adafruit_esp32spi_wifimanager.ESPSPI_WiFiManager(esp, secrets, status_light)
 43  
 44  print("Connecting to WiFi...")
 45  
 46  wifi.connect()
 47  
 48  print("Connected to WiFi!")
 49  
 50  print("Getting the time...")
 51  
 52  ntp = NTP(esp)
 53  # Wait for a valid time to be received
 54  while not ntp.valid_time:
 55      time.sleep(5)
 56      ntp.set_time()
 57  
 58  print("Time:", str(time.time()))
 59  
 60  # To use Azure IoT Central, you will need to create an IoT Central app.
 61  # You can either create a free tier app that will live for 7 days without an Azure subscription,
 62  # Or a standard tier app that will last for ever with an Azure subscription.
 63  # The standard tiers are free for up to 2 devices
 64  #
 65  # If you don't have an Azure subscription:
 66  #
 67  # If you are a student, head to https://aka.ms/FreeStudentAzure and sign up, validating with your
 68  #  student email address. This will give you $100 of Azure credit and free tiers of a load of
 69  #  service, renewable each year you are a student
 70  #
 71  # If you are not a student, head to https://aka.ms/FreeAz and sign up to get $200 of credit for 30
 72  #  days, as well as free tiers of a load of services
 73  #
 74  # Create an Azure IoT Central app by following these instructions: https://aka.ms/CreateIoTCentralApp
 75  # Add a device template with telemetry, properties and commands, as well as a view to visualize the
 76  # telemetry and execute commands, and a form to set properties.
 77  #
 78  # Next create a device using the device template, and select Connect to get the device connection details.
 79  # Add the connection details to your secrets.py file, using the following values:
 80  #
 81  # 'id_scope' - the devices ID scope
 82  # 'device_id' - the devices device id
 83  # 'key' - the devices primary key
 84  #
 85  # The adafruit-circuitpython-azureiot library depends on the following libraries:
 86  #
 87  # From the Adafruit CircuitPython Bundle (https://github.com/adafruit/Adafruit_CircuitPython_Bundle):
 88  # * adafruit-circuitpython-minimqtt
 89  # * adafruit-circuitpython-requests
 90  from adafruit_azureiot import IoTCentralDevice
 91  
 92  # Create an IoT Hub device client and connect
 93  device = IoTCentralDevice(socket, esp, secrets["id_scope"], secrets["device_id"], secrets["key"])
 94  
 95  # Subscribe to property changes
 96  # Properties can be updated either in code, or by adding a form to the view
 97  # in the device template, and setting the value on the dashboard for the device
 98  def property_changed(property_name, property_value, version):
 99      print("Property", property_name, "updated to", str(property_value), "version", str(version))
100  
101  
102  # Subscribe to the property changed event
103  device.on_property_changed = property_changed
104  
105  print("Connecting to Azure IoT Central...")
106  
107  # Connect to IoT Central
108  device.connect()
109  
110  print("Connected to Azure IoT Central!")
111  
112  message_counter = 60
113  
114  while True:
115      try:
116          # Send property values every minute
117          # You can see the values in the devices dashboard
118          if message_counter >= 60:
119              device.send_property("Desired_Temperature", random.randint(0, 50))
120              message_counter = 0
121          else:
122              message_counter = message_counter + 1
123  
124          # Poll every second for messages from the cloud
125          device.loop()
126      except (ValueError, RuntimeError) as e:
127          print("Connection error, reconnecting\n", str(e))
128          # If we lose connectivity, reset the wifi and reconnect
129          wifi.reset()
130          wifi.connect()
131          device.reconnect()
132          continue
133  
134      time.sleep(1)