Add WiFi mailbox notifier code

WiFi_Mailbox_Notifier/code.py

@@ -0,0 +1,146 @@
+# SPDX-FileCopyrightText: 2022 Kattni Rembor for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""CircuitPython WiFi Mailbox Notifier"""
+
+import time
+import ssl
+import alarm
+import board
+import digitalio
+import analogio
+import wifi
+import socketpool
+import microcontroller
+import adafruit_requests
+from adafruit_io.adafruit_io import IO_HTTP
+
+# Get WiFi/Adafruit IO details from secrets.py
+try:
+    from secrets import secrets
+except ImportError:
+    print("Please create secrets.py and add your WiFi and AIO credentials there!")
+    raise
+
+# Update to True if you want metadata sent to Adafruit IO. Defaults to False.
+METADATA = False
+
+# Initialise metadata.
+if alarm.wake_alarm:
+    print("Awake", alarm.wake_alarm)
+    # Increment wake count by 1.
+    alarm.sleep_memory[0] += 1
+else:
+    print("No wake up alarm")
+    # Set wake count to 0.
+    alarm.sleep_memory[0] = 0
+    # Set error count to 0.
+    alarm.sleep_memory[2] = 0
+
+# Set up battery monitoring.
+voltage_pin = analogio.AnalogIn(board.VOLTAGE_MONITOR)
+# Take the raw voltage pin value, and convert it to voltage.
+voltage = ((voltage_pin.value * 2) * 3.3) / 65536
+
+# Set up red LED.
+led = digitalio.DigitalInOut(board.LED)
+led.switch_to_output()
+
+# Set up the alarm pin.
+switch_pin = digitalio.DigitalInOut(board.D27)
+switch_pin.pull = digitalio.Pull.UP
+
+
+# Send the data. Requires a feed name and a value to send.
+def send_io_data(feed, value):
+    """
+    Send data to Adafruit IO.
+
+    Provide an Adafruit IO feed name, and the value you wish to send.
+    """
+    return io.send_data(feed["key"], value)
+
+
+# Print wake count to serial console.
+print("Wake count:", alarm.sleep_memory[0])
+
+# Connect to WiFi
+try:
+    wifi.radio.connect(secrets["ssid"], secrets["password"])
+    print("Connected to {}!".format(secrets["ssid"]))
+    print("IP:", wifi.radio.ipv4_address)
+
+    pool = socketpool.SocketPool(wifi.radio)
+    requests = adafruit_requests.Session(pool, ssl.create_default_context())
+# WiFi connectivity fails with error messages, not specific errors, so this except is broad.
+except Exception as e:  # pylint: disable=broad-except
+    print("Failed to connect to WiFi. Error:", e, "\nBoard will hard reset in 30 seconds.")
+    time.sleep(30)
+    microcontroller.reset()
+
+# Set your Adafruit IO Username and Key in secrets.py
+# (visit io.adafruit.com if you need to create an account,
+# or if you need your Adafruit IO key.)
+aio_username = secrets["aio_username"]
+aio_key = secrets["aio_key"]
+
+# Initialize an Adafruit IO HTTP API object
+io = IO_HTTP(aio_username, aio_key, requests)
+
+# Print battery voltage to the serial console. Not necessary for Adafruit IO.
+print(f"Current battery voltage: {voltage:.2f}")
+
+# No data has been sent yet, so the send-count is 0.
+alarm.sleep_memory[1] = 0
+
+# Turn on the LED to indicate data is being sent.
+led.value = True
+
+# While the switch is open...
+while not switch_pin.value:
+    # Adafruit IO sending can run into issues if the network fails!
+    # This ensures the code will continue to run.
+    try:
+        # Send data to Adafruit IO
+        print("Sending new mail alert and battery voltage to Adafruit IO.")
+        send_io_data(io.create_and_get_feed("new-mail"), "New mail!")
+        send_io_data(io.create_and_get_feed("battery-voltage"), f"{voltage:.2f}V")
+        print("Data sent!")
+        if METADATA:
+            print("Sending metadata to AdafruitIO.")
+            # The number of times the board has awakened in the current cycle.
+            send_io_data(io.create_and_get_feed("wake-count"), alarm.sleep_memory[0])
+            # The number of times the mailbox/battery data has been sent.
+            send_io_data(io.create_and_get_feed("send-count"), alarm.sleep_memory[1])
+            # The number of Adafruit IO errors that has occurred.
+            send_io_data(io.create_and_get_feed("error-count"), alarm.sleep_memory[2])
+            print("Metadata sent!")
+        time.sleep(30)  # Delay included to avoid data limit throttling on Adafruit IO.
+        alarm.sleep_memory[1] += 1  # Increment data send count by 1.
+        led.value = False  # Turn off the LED to indicate data sending is complete.
+
+    # Adafruit IO can fail with multiple errors depending on the situation, so this except is broad.
+    except Exception as e:  # pylint: disable=broad-except
+        print("Failed to send to Adafruit IO. Error:", e, "\nBoard will hard reset in 30 seconds.")
+        alarm.sleep_memory[2] += 1  # Increment error count by one.
+        time.sleep(30)
+        microcontroller.reset()
+
+# Deinitialise the alarm pin.
+switch_pin.deinit()
+
+# Turn off the NeoPixel/I2C power for deep sleep.
+power_pin = digitalio.DigitalInOut(board.NEOPIXEL_I2C_POWER)
+power_pin.switch_to_output(False)
+
+# Turn off LED for deep sleep.
+led.value = False
+
+# Create an alarm on pin D27.
+pin_alarm = alarm.pin.PinAlarm(pin=board.D27, value=False, pull=True)
+
+print("Entering deep sleep.")
+
+# Exit and set the alarm.
+alarm.exit_and_deep_sleep_until_alarms(pin_alarm)