This code is the firmware and python script for an internet connected air quality monitor built on a Spark Core.
The aim of the project is to build a Spark Core device which measures room temperature, humidity and carbon dioxide levels, and logs the data in a database for further analysis.
The core senses temperature from a TMP36. It sets a status led 'green' if the temperature is within a pre-defined comfort zone, red otherwise. It also sets the angle of a servo to drive an analogue temperature display.
A python script reads the sensor and relays it to TempoDB (Example plot)
## Firmware
TEMP_LOW and TEMP_HIGH define the centigrade temperature range of the comfort zone and exposes them as Spark variables of the same name.
TEMP_MIN and TEMP_MAX define the centrigrade temperature range of the servo minimum (0 degrees) and maximum (180 degrees) angle and exposes them as Spark variables of the same name.
TMP36 voltage is converted to centigrade temperature and exposed as Spark variable temperature.
The onboard multicolour LED is set to 'blue' at the lower end of the comfort zone and 'red' at the upper end. This can be disabled.
The device refreshes at interval interval milliseconds. The onboard D7 flashes each loop.
Function program allows device parameters to be altered.
A base class Core.py provides generic Spark Core state information and connection functionality, and exposes variables and functions. API functionality is provided by the Hammock module.
A derived class Temperature.py exposes temperature readings and allows parameters to be set.
A utility script monitor.py establishes a Temperature class instance and a TempoDB client. It reads the temperature, prints it to the terminal, and uploads the data to TempoDB.
A configuration file (not included) provides authentication details for Spark and TempoDB APIs.