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I used the sensor you linked and was able to read the data without issue on Arduino using a thermistor library. My code is posted here: Pool-Controller/Pool-Controller.ino at master · Here-Be-Dragons/Pool-Controller · GitHub

Re: Automating Pump & Solar using Arduino for under 40 bucks The PCB is available via my GitHub in the eagle folder (GitHub - Here-Be-Dragons/Pool-Controller: Cloud-based pump speed, solar collector controls, and temperature monitoring for your pool), or can be ordered directly from...

I'm positive you can find an arduino-compatible relay that can handle as much load as you can possibly throw at it. Look into the SSR-25DA or SSR-40DA.

I did something similar here, maybe some of the code will be helpful to you. Particle now supports the RPi, so you'd be able to use the webhook stuff I used as well. GitHub - Here-Be-Dragons/Pool-Controller: Cloud-based pump speed, solar collector controls, and temperature monitoring for your pool

Wanted to update everyone on version 2 of this project. Improvements: 1. Created a proper printed PCB for the controller. 2. Added solar override on/off to be controllable via Home Automation (SmartThings). 3. Added 3 temperature sensors: Pre-solar, post-solar, and roof temp. Also pulling air...

Edit: See post #3 for the updated controller. Edit 2: Now with full SmartThings integration for both Pump Control, Temperature readouts, and Solar control. See post #9 for a screenshot of the interface. When my single-speed pump failed, I did some research and realized I'd have an issue...