Hot Tub Remote

This is a WiFi remote using a Esp8266 in the form of a Wemos D1 mini. It enables remote control of a Lay-z-Spa (3 wire model, #54075) via a Web API.

Features

The following features can be controlled:

• Turn pump, heater and bubbles on / off
• Adjust temperature and max temperature
• View pump, heater and bubbles status
• View current temperature
• Lock temperature setting - revert any changes made by the control panel
• Auto-restart - the pump turns off after 24H, this will re-start the pump automatically

Web API

The following URIs are available:

Uri	Method	Sample data
/autoRestart	POST	{ "state": true }
/pump	POST	{ "state": true }
/blower	POST	{ "state": true }
/heater	POST	{ "state": true}
/temperature/target	POST	{ "value": 37 }
/temperature/limit	POST	{ "value": 40 }
/temperature/lock	POST	{ "state": true }
/status	GET	{ "currentState": { "pumpState": 1, "temperature": 35 }, "targetState": { "pumpState": 3, temperature": 35 }, "autoRestart": true, "temperatureLock": true, "limitTemperature": 40, "errorCode": 0 }

MQTT

The following Topics are available:

Topic	Sample Data
/hottub/cmnd/autoRestart	{ "state": true }
/hottub/cmnd/pump	{ "state": true }
/hottub/cmnd/blower	{ "state": true }
/hottub/cmnd/heater	{ "state": true }
/hottub/cmnd/temperature/target	{ "value": 37 }
/hottub/cmnd/temperature/limit	{ "value": 40 }
/hottub/cmnd/temperature/lock	{ "state": true }

On any state change a message containg the complete status is sent to the following topic: /hottub/state/status

Controller interface schematic

All available commands were recorded using an OLS Logic sniffer and the signals.xml file was created using WaveMe