Hardware

Hardware is a Wemos Mini D1 pro as the brains

4 relay board for lower power controls. Will control heater and high power relay

Controls spa pump (high power relay controlled by smaller relay)

Controls heater using relays (one or two)

Air for jets is controlled by separate air switch not part of automation.

Temperature sensor for heater control.

Air switch by spa to turn pump on off. Also can turn heater on.

Air switch connecter to 115V switch connected to 115V relay. Relay connected to D1 input pin, looking for change of state.

virtual switches to turn on spa, heater. Thermostat to set heater temp.