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