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This water quality probe was mine, and three others, senior project in computer engineering that we worked on during our final year at Elizabethtown College. We meant to produce the probe as simply as possible, more as a proof of concept, instead of proving how small or cheapily the device could be made. Most of the electronics were off-the-shelf parts from Adafruit and Sparkfun, all contained in a 3D-printed casing we designed. …

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