Orcon MVS Ventilation System

Hardware
21

@wietse1
Here’s the setup I use:

esphome:
  name: mvcontroller
  platform: ESP8266
  board: d1_mini


captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "<USETHEONEHACAMEUPWITHONINSTALATION>"

ota:
  password: "<HAWILLSUGGESTONEONINSTALATION>"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Mvcontroller Fallback Hotspot"
    password: "<APASSWORDYOUDECIDE"
i2c:

output:
  - platform: esp8266_pwm
    pin: D6
    frequency: 1000 Hz
    id: orcon_mv_pwm_out
    inverted: true
  - platform: template
    id: dummy
    type: float
    write_action:
      - logger.log: "Something was written to dummy."

switch:
  - platform: gpio
    id: bypass
    name: "Orcon speed bypass"
    pin: 
      number: D8
      inverted: False

fan:
  - name: "Orcon"
    id: "orcon"
    icon: "mdi:hvac"
    platform: speed  # sliding output
    output: dummy

    restore_mode: ALWAYS_ON

    on_turn_on:
      - logger.log: "Turning on Orcon"
    on_turn_off:
      - logger.log: "Turning off Orcon"
      - lambda: "id(orcon).speed = 1;"
    on_speed_set:
      - logger.log: "Speed changed."
      - lambda: |-

            // Set a little margin so we don't keep toggling the relay if
            // the requested and set speeds are very similar.
            int margin = 5;

            // Contains requested speed by the machine (0-100)
            int req = int(id(orcon_mv_requested_speed).state);
            // Contains requested speed by the user (0-100)
            int now = int(id(orcon).speed);
    
            // ESP_LOGD("req", "%d", req);
            // ESP_LOGD("now", "%d", now);

            if (now > (req - margin)) {
                id(bypass).turn_on();

                id(orcon_mv_pwm_out).set_level(
                    float(now / 100.0)
                );

            } else {
                id(bypass).turn_off();
                id(orcon_mv_pwm_out).set_level(0.0);
            }

sensor:
  - platform: pulse_counter
    pin: D5
    name: Orcon Tachometer
    id: orcon_mv_tachometer
    update_interval: 5s
    accuracy_decimals: 0
    internal_filter: 250us
    unit_of_measurement: rpm
  - platform: duty_cycle
    name: "Orcon MV Requested speed"
    id: orcon_mv_requested_speed
    internal: true
    unit_of_measurement: "%"
    accuracy_decimals: 0
    pin:
      number: D7
      mode: INPUT_PULLUP
      inverted: no
    update_interval: 20s
    filters:
      lambda: "return int(x);"

    on_value:
      - lambda: |-
            // Hacky way to trigger the original code instead of duplicating.
            if (id(orcon).state) {
                auto call = id(orcon).turn_on();
                call.set_speed(id(orcon).speed);
                call.perform();
            }

and for the automation to turn it on when the humidity rises in the bathroom:

alias: Bathroom - ventilation on
description: ""
trigger:
  - platform: numeric_state
    entity_id:
      - sensor.humidity_temp_1_humidity
    for:
      hours: 0
      minutes: 1
      seconds: 0
    above: 72
condition: []
action:
  - service: fan.turn_on
    metadata: {}
    data:
      percentage: 100
    target:
      entity_id: fan.orcon
mode: single

and off again on a certain level:

alias: Bathroom - ventilation back to auto
description: ""
trigger:
  - platform: numeric_state
    entity_id:
      - sensor.humidity_temp_1_humidity
    for:
      hours: 0
      minutes: 1
      seconds: 0
    below: 65
condition: []
action:
  - service: fan.turn_off
    data: {}
    target:
      entity_id: fan.orcon
mode: single
1 Like
22

Thank you! I just had this ventilation system installed a few months ago and thought it was broken because it kept running even during the day. Your comment made me realize it’s probably because it’s been raining so much lately.

23

So what is the best way to integrate ORCON ventilation to the home assistant? :slight_smile:

24

I can advise the Open AIR Mini.

25

More than a year later and I finally have an outdoor weather station. So I can finally include my absolute humidity detection.

Just to double-check my assumptions… If I compare the Absolute Humidity (calculated separately for bathroom and outside), then I find the humidity that decides if I should ventilate. If outside is lower, ventilate, if inside is lower, don’t.

Do I have to factor in the fact that outside air is 10 degrees colder than inside? Am I assuming that inside will heat up the air fast enough for the dewpoint to increase?

Thanks!