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Preliminary CO2 sensor testing. At this stage of development, many different CO2 sensors were tested to find the one most suitable for our array.
All of our SCD-30 sensors connected to a breadboard. Although Scenic, this is not representative of our final design. The SCD-30 sensor was the best for our system, being that it provided the most accurate and timely measurement given the price.
Shown above is the multiplexer connected to our Arduino. Much research and effort went into coding these multiplexers to ensure perfect connection. These are vital, distributing special addresses to each CO2 sensor, allowing one microcontroller to read from multiple sensors.
The completed sensor array. Connected to each breadboard is a fully calibrated SCD-30 sensor. Each sensor connects to the central multiplexer, allowing the Arduino microcontroller to communicate with every CO2 sensor at the same time.
CONTAM CO2 room sensor test. From simulation, a CO2 source and a pressure differential activate to mimic a human heavily blowing across CO2 sensors. This was before we had CO2 canisters to mimic human breath for us.
Description of our first experiment. CO2 sensors were placed 30cm apart from the edge of a desk to observe CO2 concentrations away from a source of CO2. In this test, Colton blew over the sensors from the left hand side of the image.
An image of all of the tools needed to build our CO2 sensor array.
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