I was given an old hot tub and spa pack.
Spa pack is from early 90’s with mechanical timer and mechanical temperature control.
Timer no longer spins and there is no manual temperature control.
So i’m using an RPI3 for this now.
I’m using one-wire temp sensors in place of mechanical thermostat switches.
Interfacing the main contactor with a relay board attached to the PI is no issue either.
setting up a not being used temp range is again easy.
I want to have 4 temp ranges.
How do I control the upper temp limit?
If I have trigger to kill the heater at 101 f won’t that stop the 102 and 103 buttons/triggers from working?
any ideas on how I can do this and still be able to control it via tablet?