8 Zone HVAC Controller for Home Assistant

I was looking for a solution that replaces a standard zone controller. It takes 24v ac and then sends it out to one of 4 zones to tell them either to open or close.

Sometimes at night I want to disable or enable a zone, so I came up with this:

The components I used:

• 3d printed chassis
• 5v 8 way relay board
• An esp32 running esphome
• An ac to dc converter.

This means that you can add this device to home assistant and end up with something like this:

If you would like any info on this project. Let me know! Or if you would like to purchase a pre made one, please head over to the store.

[Edit] after some interest from the home assistant facebook group https://www.facebook.com/groups/2091834914421201 here is the yaml config for esphome:

esphome:
  name: "esphome-web-436e71"
  friendly_name: zone control
  # Ensure all switches turn on by default on boot
  on_boot:
    priority: 100 # Highest priority, ensures all switches turn on without delay.
    then:
      - switch.turn_on: switch1
      - switch.turn_on: switch2
      - switch.turn_on: switch3
      - switch.turn_on: switch4
      - switch.turn_on: switch5
      - switch.turn_on: switch6
      - switch.turn_on: switch7
      - switch.turn_on: switch8

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "matsgMVvo4ElSqlclQCaLxlKAL1VrRpBOf4LDF+T/cE="

ota:
  platform: esphome
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esphome-Web-9995A0"
    password: "rtyWK8HejFHm"

captive_portal:

switch:
  - platform: gpio
    name: "Switch 1"
    pin: GPIO27
    id: switch1
    inverted: False

  - platform: gpio
    name: "Switch 2"
    pin: GPIO32
    id: switch2
    inverted: true

  - platform: gpio
    name: "Switch 3"
    pin: GPIO25
    id: switch3
    inverted: True

  - platform: gpio
    name: "Switch 4"
    pin: GPIO33
    id: switch4
    inverted: False

  - platform: gpio
    name: "Switch 5"
    pin: GPIO26
    id: switch5
    inverted: True

  - platform: gpio
    name: "Switch 6"
    pin: GPIO19
    id: switch6
    inverted: true

  - platform: gpio
    name: "Switch 7"
    pin: GPIO18
    id: switch7
    inverted: true

  - platform: gpio
    name: "Switch 8"
    pin: GPIO17
    id: switch8
    inverted: true

sensor:
  - platform: internal_temperature
    name: "Internal Temperature"

  - platform: wifi_signal
    name: ${friendly_name} wifi signal
    update_interval: 600s

  # human readable uptime sensor output to the text sensor above
  - platform: uptime
    name: ${friendly_name} Uptime in Days
    id: uptime_sensor_days
    update_interval: 60s
    on_raw_value:
      then:
        - text_sensor.template.publish:
            id: uptime_human
            state: !lambda |-
              int seconds = round(id(uptime_sensor_days).raw_state);
              int days = seconds / (24 * 3600);
              seconds = seconds % (24 * 3600);
              int hours = seconds / 3600;
              seconds = seconds % 3600;
              int minutes = seconds /  60;
              seconds = seconds % 60;
              return (
                (days ? String(days) + "d " : "") +
                (hours ? String(hours) + "h " : "") +
                (minutes ? String(minutes) + "m " : "") +
                (String(seconds) + "s")
              ).c_str();

time:
  - platform: homeassistant
    id: homeassistant_time

# Text sensors with general information.
text_sensor:
  # Expose ESPHome version as sensor.
  - platform: version
    name: $friendly_name Version
  # Expose WiFi information as sensors.
  - platform: wifi_info
    ip_address:
      name: $friendly_name IP
    bssid:
      name: $friendly_name BSSID

  # human readable update text sensor from sensor:uptime
  - platform: template
    name: Uptime Human Readable
    id: uptime_human
    icon: mdi:clock-start