ESP32 Custom Spa Controller

Control a custom hot tub using a bunch of relays and sensors.

This is work-in-progress.

Design Goals

• Control (via relays) of (at least):
  • 2-speed pumps
  • blower
  • heater
  • lights
  • (TBD) Valve actuators with smart power-off
• Reading temperature sensor data and tying it to controls (eg heater)
• Sheduling on/off behavior
• Overriding said schedule briefly (eg pump to high for 20 minutes)
• (TBD) Overriding said schedule in the future (eg heater up 10 degrees for the weekend)
• Web UI
• Touchscreen UI using wireless display/ESP32 boards via ESP-NOW protocol
• OTA updates

Hardware design

• Simple controls use single relays
• 2-speed controls use two SPDT relays (1 for on, 2 for speed), wired in series.

Installation on a new ESP32

1. Copy secrets.h.sample to secrets.h and edit for your settings

Controller

In controller/ subdirectory:

2. Build and upload the controller code using either:

• Arduino IDE (ensure you have ESP32 board support installed)
• arduino-cli, if installed (try make upload)

3. Reboot the board and check that it's on the network and listening on port 80
4. Upload the web interface using either:

• Arduino IDE: Use this plugin
• Command Line: try make upload-spiffs-via-http

See README.md in that directory

Display

Instructions are similar to Controller See README.md in that directory