Add SPI example

examples/bme680_spi.py

@@ -0,0 +1,27 @@
+import time
+import board
+import digitalio
+from busio import SPI
+import adafruit_bme680
+
+# Create library object using our Bus SPI port
+cs = digitalio.DigitalInOut(board.D10)
+spi = SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
+bme680 = adafruit_bme680.Adafruit_BME680_SPI(spi, cs)
+
+# change this to match the location's pressure (hPa) at sea level
+bme680.sea_level_pressure = 1013.25
+
+# You will usually have to add an offset to account for the temperature of
+# the sensor. This is usually around 5 degrees but varies by use. Use a
+# separate temperature sensor to calibrate this one.
+temperature_offset = -5
+
+while True:
+    print("\nTemperature: %0.1f C" % (bme680.temperature + temperature_offset))
+    print("Gas: %d ohm" % bme680.gas)
+    print("Humidity: %0.1f %%" % bme680.relative_humidity)
+    print("Pressure: %0.3f hPa" % bme680.pressure)
+    print("Altitude = %0.2f meters" % bme680.altitude)
+
+    time.sleep(1)