Add Sqlite logging of readings

.travis.yml

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+language: python
+python:
+  - "2.7"
+# command to install dependencies
+# install:
+#  - pip install -r requirements.txt
+#  - pip install pytest
+# command to run tests
+# script:
+#  - pytest # or py.test for Python versions 3.5 and below
+script:
+  - python test.py

README.md

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+[![Build status](https://travis-ci.org/kai/raspberry-bme680.svg?master)](https://travis-ci.org/kai)
+
 # BME680
 
 https://shop.pimoroni.com/products/bme680

examples/read-all-sqlite.py

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+#!/usr/bin/env python
+
+import bme680
+import time
+import sqlite3
+
+def main():
+
+    sensor = bme680.BME680()
+
+    database = "~/sensordata.db"
+
+    # create a database connection
+    conn = create_connection(database)
+
+    # These calibration data can safely be commented
+    # out, if desired.
+
+    print("Calibration data:")
+    for name in dir(sensor.calibration_data):
+
+        if not name.startswith('_'):
+            value = getattr(sensor.calibration_data, name)
+
+            if isinstance(value, int):
+                print("{}: {}".format(name, value))
+
+    # These oversampling settings can be tweaked to
+    # change the balance between accuracy and noise in
+    # the data.
+
+    sensor.set_humidity_oversample(bme680.OS_2X)
+    sensor.set_pressure_oversample(bme680.OS_4X)
+    sensor.set_temperature_oversample(bme680.OS_8X)
+    sensor.set_filter(bme680.FILTER_SIZE_3)
+    sensor.set_gas_status(bme680.ENABLE_GAS_MEAS)
+
+    # print("\n\nInitial reading:")
+    # for name in dir(sensor.data):
+    #    value = getattr(sensor.data, name)
+
+    #    if not name.startswith('_'):
+    #        print("{}: {}".format(name, value))
+
+    sensor.set_gas_heater_temperature(320)
+    sensor.set_gas_heater_duration(150)
+    sensor.select_gas_heater_profile(0)
+
+    # Up to 10 heater profiles can be configured, each
+    # with their own temperature and duration.
+    # sensor.set_gas_heater_profile(200, 150, nb_profile=1)
+    # sensor.select_gas_heater_profile(1)
+
+    try:
+        while True:
+            if sensor.get_sensor_data():
+                reading = "{0:.2f},{1:.2f},{2:.2f}".format(sensor.data.temperature, sensor.data.pressure, sensor.data.humidity)
+
+                if sensor.data.heat_stable:
+                    reading = "{0},{1} Ohms".format(reading, sensor.data.gas_resistance)
+
+                # else:
+                #    print(output)
+
+                with conn:
+                    task_id = create_entry(conn, reading)
+                    print(task_id)
+
+            time.sleep(30)
+
+    except KeyboardInterrupt:
+        pass
+
+def create_connection(db_file):
+    """ create a database connection to the SQLite database
+        specified by db_file
+    :param db_file: database file
+    :return: Connection object or None
+    dbfile = sensordata.db
+    """
+    try:
+        conn = sqlite3.connect(db_file)
+        return conn
+    except Error as e:
+        print(e)
+
+    return None
+
+def create_entry(conn, entry):
+    """
+    Create a new project into the projects table
+    :param conn:
+    :param project:
+    :return: project id
+    """
+    sql = ''' INSERT INTO bme680readings(temp,pressure,humidity,resistance)
+              VALUES(?,?,?,?) '''
+    cur = conn.cursor()
+    cur.execute(sql, entry)
+    return cur.lastrowid
+
+if __name__ == '__main__':
+    main()

test.py

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+print("Hello world!")