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Simple Arduino based controller for the pump and heater of Bestway Lay-Z-Spa.
This is a basic module to replace the brain of the factory unit in order to achieve better temperature control and to automatically keep the spa hot without the pump running 24/7.
Temperature is preset at 38.5 degrees celsius and is not user adjustable. Simply power on the unit to automatically heat the spa. This version has no user controls, only outputs to indicate status.