This device is intended to provide the user with a cost-efficient means of determining air quality. Our sensor focuses on the five components of the Environmental Protection Agency’s Air Quality Index: ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrous oxide. This device detects all of these pollutants except sulfur dioxide. The device also includes a town gas sensor to alert the user to gas leaks or the presence of flammable gases. Furthermore, a temperature and humidity sensor is included as these conditions can impact the performance of the gas sensors.
We have yet to fully calibrate our device, but we have extracted data from sensor data sheets to make some preliminary estimations. The sensors used are relatively inexpensive and vary greatly from component to component so they need to be calibrated with known concentrations of the target gasses. We have not yet had the opportunity do so.
Control and Power
• Arduino Uno
• 5V power supply
• RGB 16×2 LCD shield
• Shinyei PPD42 Particulate Matter Detector
• MQ-2 Gas Sensor
• MQ-9 Gas Sensor
• MiCS-2714 Gas Sensor (NO2)
• MiSC-2614 Gas Sensor (Ozone)
• Keyes DHT11 Temperature and Humidity Sensor
Box and Assembly
• Access to 3D printer
• Solder Board
• 5V fan
• 10 to 15 wires of gauge 24
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