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Air quality sensing device for Murdoch Library

Kamarudin, Nazirul Haziq (2017) Air quality sensing device for Murdoch Library. Honours thesis, Murdoch University.

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This thesis project is concerned with building a device that measures the concentration of Particulate Matter (PM) in the Murdoch Library’s air. The particles measured are PM 2.5 which have diameter less than 2.5 μg and PM10 with a particle diameter less than 10 μg. This data then was collected using a NOVA SDS011 sensor which connected to a Arduino Mega. In order to communicate with the library’s building system management, a 16-bit resolution Pulse Width Modulation (PWM) signal was produced by the Arduino Mega, which varied from 0 to 5V and is directly proportional to the concentration number for both PM2.5 and PM10. These values can be monitored through an LCD embedded within this device and a SD Card Data logger used to store the data onto an SD Card. A Real-Time Clock (RTC) break out board was used in order to provide a timestamp when the data was logged onto the SD Card. PWM signals were successfully generated, however the signals were noisy due to the cable used. The noise can be reduced by using a shielding cable and other options can be considered to transmit the data to the building system such as MODBUS or by using a Wi-Fi connection.

Item Type: Thesis (Honours)
Murdoch Affiliation(s): School of Engineering and Information Technology
Supervisor(s): Lee, Gareth
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