Software

Architecture

Software is in two parts:

• Code running locally on the MVP's Raspberry Pi
• User Interface (UI) code running on the cloud server

These pages are about the custom MVP code. For generic information about packages, see the following:

Sensors

Standard Sensors

• SI7021 Temperature/Humidity
• TSL2561 LUX sensor

Optional Sensors

• CCS811 CO2 Sensor
• NDIR CO2 Sensor
• OneWire OneWire Temperature sensors
• SCD30 CO2 Sensor

Other

• ADS1115 Analog to Digital Converter

Database and data storage

• CouchDB The database for storing data
• Google Sheets - Using Google Sheets as a database (and charting)

Web Server - Access from the web

• DDNS Getting a stable address on the web
• NGINX Securing your presence on the web

Code Architecture

The MVP code currently consists of three main parts:

• Controller (currently the Linux CRON process): control the timing of events
• Scripts (/home/pi/MVP/scripts): these package the Python code for group operations, and provide separation between the controller and functions.
• Code (/home/pi/MVP/python): most actions are executed through Python code files. This code represents sensors, controllers, utilities (data handling,logging, ...) and reporting.

Releases

• V1
• V2.1
• V3

Coding Standards

Data_Model