My Set Temperature switch is much more sturdy, and it is now detachable! I would still like a switch that just plugs into the Arduino's headers, so I ordered this one off Adafruit, along with some more wires, headers, and other connectors. My next steps are to figure out how to mount the servo on the sink knob, and to further waterproof the sensor and also mount it on the sink. This way I don't have to hold either of them during testing, and I can hold my computer instead.
I still have to deal with the issue of extending the temperature sensor. The further it gets from the Arduino, the more screwy the readings are. Apparently you have to add a resistor, but even that wasn't giving me great results. My wiring was pretty crappy too though, so I'm hoping that was the main issue. Perhaps CAT5 would help... it's designed to keep the signals as fresh as possible during their travels. I also just ordered a digital temperature sensor and also a pre-waterproofed thermistor temperature sensor. If I can't get the one I have to work, I'm sure one of those two would work great.
I also have an idea that will make use of what I already have going: pivot (slightly)! This is startup language for "change the direction of the product to accomodate current trends". I'm thinking that since I already have one servo mounted on my bathroom sink, I could just mount the other one and then bind them together, which would mount them in place! Then I could turn the project into a sink controller, and have presets for "cold", "hot", and "warm" and maybe a couple others. When someone wants to wash their hands, they can just hit "warm" and take a piss or something while the unit calibrates the water temperature, and then it will beep when it's ready! I can continue later with controlling the shower. Yay!
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