ESPHome Thermostat HVAC Controller (ESP32-S3-Relay-6CH) This project configures an ESPHome-based thermostat and HVAC controller using the Waveshare ESP32-S3-Relay-6CH board. It provides dual-point climate control, system runtime protections, Home Assistant integration, and visual relay feedback using an onboard WS2812 RGB LED.
Note: This configuration requires ESPHome version 2025.4.0 or newer. It may work on earlier versions, but it is untested.
The information on the Waveshare ESP32-S3-Relay-6CH board can be found at : https://www.waveshare.com/wiki/ESP32-S3-Relay-6CH It can be found on Amazon for a decent price, Or Waveshare directly.
Features 
Dual-point thermostat with heat/cool mode
Runtime protection (minimum on/off times)
Preset modes (Home, Comfort, Sleep, Away, OverCool, Warm Up)
Integration with Home Assistant
Web UI and OTA updates
RGB LED status indicator
Remote temperature & humidity sensors from Home Assistant
Hardware 
Board: ESP32-S3-Relay-6CH Processor: ESP32-S3
Relays: 6 isolated relays (10A 250V AC / 10A 30V DC)
LED Indicator: WS2812 RGB LED on GPIO38
Connectivity: Wi-Fi + USB-C
Power: 7–36V DC (via terminal) or 5V via USB-C
Enclosure: DIN rail mountable ABS case
GPIO Pin Mapping Relay Function Channel GPIO Pin Fan CH1 GPIO1 Low Heat (W1) CH2 GPIO2 High Heat (W2) CH3 GPIO41 Cool (Y1) CH4 GPIO42 Unused CH5 GPIO45 Unused CH6 GPIO46 RGB Status LED - GPIO38 
Diagrams & Resources 
Wiring Diagram & Dimensions
Schematic PDF
ESPHome Devices Page
YAML Features Overview Wi-Fi & API Static IP support
OTA updates
Improv Serial and AP fallback
Climate Control Dual-point thermostat (heat/cool)
Configurable temperature step size
Minimum run/off times for safety
Preset modes with default temps
Fan-only, heat, cool, idle actions mapped to relays
RGB LED feedback for each HVAC mode
Diagnostics Wi-Fi signal strength (dBm and %)
Connected SSID, IP, MAC address
Firmware version
Relay Control Individual GPIO-based relay controls
Status binary sensor
Restart, Safe Mode, and (disabled) Factory Reset buttons
Installation Flash the device using ESPHome or ESPHome Web.
Add Wi-Fi credentials using Improv or YAML.
Integrate into Home Assistant via the ESPHome integration.
Adjust the climate entity settings in Home Assistant as needed.
Credits YAML maintained and tested by [Your Name or Handle]
Hardware by Waveshare
Built using ESPHome
License MIT License
Happy automating! 