Some guidelines needed. I have created a bang bang controller with all relevant switches to completely control my Spa. If lower temp is reached circulation pump and heater is turned on and if max reached all turns off. All pumps are controller by normal Hass on/off switches. My problem is that while in a Spa you do not have a cell or similar to control the Spa due to water. I am busy creating push buttons to control the pumps externally but want to display my water temp on a display. can somebody guide me in the right direction.
Ok did find a suitable solution.