Raspberry pi gas sensor data collection

This program is written in Python 2. It collects and stores sensor data (O2, CO2, and Humidity) attached to a Raspberry Pi. It also controls a motor pump through a relay switch. By running AnalyzeGasSample class, you can begin an experiment where a pump pushes desired gas towards sensors and sensor data is collected and appended to a text file.

Sensors:

• COZIR CM-0123 (CO2 sensor)
• KE-25 (O2 sensor)
• DHT22 (Humidity sensor)

Dependencies:

• Adafruit_ADS1x15 library (it's an analog to digital converter for reading the O2 sensor)
• Adafruit_DHT library (for reading the humidity sensor values)

Examples:

By default, the program assumes that the relay switch is connected to pin 7, while the humidity sensor is connected to GPIO27. Remember to change those settings if your setup varies.

To start a gas collection and composition analysis experiment, run the code below.

AnalyzeGasSample().begin_experiment()

To view raw sensor outputs:

Sensors().print_o2_co2_humidity_values()