Add environmental monitor example (#68)

Author: brentru

Diff for: examples/basics/environmental_monitor.py

@@ -0,0 +1,134 @@
+"""
+'environmental_monitor.py'
+===============================================================================
+Example of sending I2C sensor data
+from multiple sensors to Adafruit IO.
+
+Tutorial Link: https://learn.adafruit.com/adafruit-io-air-quality-monitor
+
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+
+Author(s): Brent Rubell for Adafruit Industries
+Copyright (c) 2018 Adafruit Industries
+Licensed under the MIT license.
+All text above must be included in any redistribution.
+
+Dependencies:
+    - Adafruit_Blinka (CircuitPython, on Pi.)
+        (https://github.com/adafruit/Adafruit_Blinka)
+    - Adafruit_CircuitPython_SGP30.
+        (https://github.com/adafruit/Adafruit_CircuitPython_SGP30)
+    - Adafruit_CircuitPython_VEML6070.
+        (https://github.com/adafruit/Adafruit_CircuitPython_VEML6070)
+    - Adafruit_CircuitPython_BME280.
+        (https://github.com/adafruit/Adafruit_CircuitPython_BME280)
+"""
+
+# Import standard python modules
+import time
+
+# import Adafruit Blinka
+import board
+import busio
+
+# import sensor libraries
+import adafruit_sgp30
+import adafruit_veml6070
+import adafruit_bme280
+
+# import Adafruit IO REST client
+from Adafruit_IO import Client, Feed, RequestError
+
+# loop timeout, in seconds.
+LOOP_DELAY = 10
+
+# Set to your Adafruit IO key.
+# Remember, your key is a secret,
+# so make sure not to publish it when you publish this code!
+ADAFRUIT_IO_KEY = 'YOUR_AIO_KEY'
+
+# Set to your Adafruit IO username.
+# (go to https://accounts.adafruit.com to find your username)
+ADAFRUIT_IO_USERNAME = 'YOUR_AIO_USERNAME'
+
+# Create an instance of the REST client
+aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
+
+try: # if we already have the feeds, assign them.
+    tvoc_feed = aio.feeds('tvoc')
+    eCO2_feed = aio.feeds('eco2')
+    uv_feed = aio.feeds('uv')
+    temperature_feed = aio.feeds('temperature')
+    humidity_feed = aio.feeds('humidity')
+    pressure_feed = aio.feeds('pressure')
+    altitude_feed = aio.feeds('altitude')
+except RequestError: # if we don't, create and assign them.
+    tvoc_feed = aio.create_feed(Feed(name='tvoc'))
+    eCO2_feed = aio.create_feed(Feed(name='eco2'))
+    uv_feed = aio.create_feed(Feed(name='uv'))
+    temperature_feed = aio.create_feed(Feed(name='temperature'))
+    humidity_feed = aio.create_feed(Feed(name='humidity'))
+    pressure_feed = aio.create_feed(Feed(name='pressure'))
+    altitude_feed = aio.create_feed(Feed(name='altitude'))
+
+# Create busio I2C
+i2c = busio.I2C(board.SCL, board.SDA, frequency=100000)
+# Create VEML6070 object.
+uv = adafruit_veml6070.VEML6070(i2c)
+# Create BME280 object.
+bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
+bme280.sea_level_pressure = 1013.25
+# Create SGP30 object using I2C.
+sgp30 = adafruit_sgp30.Adafruit_SGP30(i2c)
+sgp30.iaq_init()
+sgp30.set_iaq_baseline(0x8973, 0x8aae)
+
+# Sample VEML6070
+def sample_VEML():
+    for j in range(10):
+      uv_raw = uv.read
+    return uv_raw
+
+
+while True:
+    print('Reading sensors...')
+    # Read SGP30.
+    eCO2_data = sgp30.co2eq
+    tvoc_data = sgp30.tvoc
+
+    # Read VEML6070.
+    uv_data = sample_VEML()
+
+    # Read BME280.
+    temp_data = bme280.temperature
+    # convert temperature (C->F)
+    temp_data = int(temp_data) * 1.8 + 32
+    humid_data = bme280.humidity
+    pressure_data = bme280.pressure
+    alt_data = bme280.altitude
+
+    print('sending data to adafruit io...')
+    # Send SGP30 Data to Adafruit IO.
+    print('eCO2:', eCO2_data)
+    aio.send(eCO2_feed.key, eCO2_data)
+    print('tvoc:', tvoc_data)
+    aio.send(tvoc_feed.key, tvoc_data)
+    time.sleep(2)
+    # Send VEML6070 Data to Adafruit IO.
+    print('UV Level: ', uv_data)
+    aio.send(uv_feed.key, uv_data)
+    time.sleep(2)
+    # Send BME280 Data to Adafruit IO.
+    print('Temperature: %0.1f C' % temp_data)
+    aio.send(temperature_feed.key, temp_data)
+    print("Humidity: %0.1f %%" % humid_data)
+    aio.send(humidity_feed.key, int(humid_data))
+    time.sleep(2)
+    print("Pressure: %0.1f hPa" % pressure_data)
+    aio.send(pressure_feed.key, int(pressure_data))
+    print("Altitude = %0.2f meters" % alt_data)
+    aio.send(altitude_feed.key, int(alt_data))
+    # avoid timeout from adafruit io
+    time.sleep(LOOP_DELAY * 60)