Step 13: Dowload PDF of Materials & Fabrication Plans

A circuit diagram might be helpful, especially for the connections to the Arduino board. These connections are described in words, but a picture, or diagram, would make this more clear. BTW, looking a the code in Step 9, it looks like you are expecting the pH sensor, or rather the parallel combination of pH sensor and 10K resistor, to give integer values between 0 and 15, which correspond to an actual sensor voltage of about 0 to 4.88*15=73.2 mV. I am guessing that you figured out these levels empirically, by testing the thing with different known samples of water. Is this right? Also from the code in Step 9, I am wondering if this sensor is capable of detecting alkaline water? The levels seem to be set at, normal, medium acid, and high acid.

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