🚿 Bathroom Humidity Exhaust Fan

Blacky · October 6, 2023, 11:31am

FAQ - Can you show us your full set up?

Below is one of my bathrooms. I will show all my controllers (ESP32), sensors, setting along with the settings for my sensor light as it all works together. I will try an document as much as possible for you. If you need more information just let us know. It is a big read so maybe make yourself a coffee first.

NOTE: I am waiting on some parts as they have just been released and I am updating my systems. When I receive them I will update this post, so if your interested then maybe check back in in a few weeks.

The Controller And Sensors

All the items are from m5stack. I have spare controllers and sensors if they need to be replaced ASAP.

ATOM Lite ESP32 IoT Development Kit

ENV III Unit with Temperature Humidity Air Pressure Sensor

Dlight Unit - Ambient Light Sensor

PIR Motion Sensor

ATOMIC PortABC Extension Base

I2C Hub 1 to 6 Expansion Unit

The Bathroom

Below is one of my bathrooms. Note, the linear slot diffuser directly above the shower head, this is critical for the automation to work correctly. It is connected to my exhaust fan and sucks air over the sensor when the fan is ON. Inside this linear slot diffuser is my humidity sensor.

Below shows the LED lighting. They are separated into segments… the mirror, under the vanity and in the niche

Inside the linear slot diffuser the cable passes through into the cushion head. This cable is in the ceiling space where the ESP32 is plugged into mains power.

I have cut out one of the slots so the sensor finishes flush with the face of the linear slot diffuser. I also painted the cover of the sensor black to hide it and drilled some small holes in the other side of the sensor cover to allow for good airflow trough it.

Below is the sensor fitted to the linear slot diffuser.

Under the vanity is my LUX and motion sensor.

The code used in the ESP32 (atom light) and esphome

This is for the humidity sensor, temp sensor, LUX sensor, motion sensor, door sensor and the “Manual Fan Switch”.

## "#" = Item - "##" = Note - "###" = DEACTIVATED option

esphome:
  name: bed2-ens
  friendly_name: Bed 2 Ensuite

esp32:
  board: m5stack-atom
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: !secret encryption_key

# Over The Air Password (Stops somone on your network accessing files)
ota:
  password: !secret esphome_secret

# Wifi Information
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

## Optional manual - Static IP
###  manual_ip:
###    static_ip: ?.?.?.?
###    gateway: ?.?.?.?
###    subnet: 255.255.255.0

# Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "bed2-ens"
    password: !secret fallback_ap_password

# Captive Portal
## After 1 minute of unsuccessful WiFi connection attempts, 
## the Atom Lite will start a WiFi hotspot (with the credentials from your fallback).
## Use your AP (Access Point WiFi) SSID & Password to connect then go to http://192.168.4.1/ in your browser.
captive_portal:

# This is for sensors plugged into I2C Hub 1 to 6 Expansion Unit - It can be tricky

i2c:
  sda: 25
  scl: 21
  scan: true

sensor:
  - platform: bh1750
    name: "LUX Sensor"
    address: 0x23
    update_interval: 10s

  - platform: sht3xd ## sht3xd is for a ENV III - sht4x is for a ENV IV
    temperature:
      name: "Bathroom Temperature"
      id: bathroom_temperature
    humidity:
      name: "Bathroom Humidity"
      id: bathroom_humidity
    address: 0x44
    update_interval: 60s

  - platform: qmp6988 ## qmp6988 is for a ENV III - bmp280 is for a ENV IV
    pressure:
      name: "Bathroom Pressure"
    address: 0x70 ## 0x70 is for a ENV III - 0x76 is for a ENV IV
    update_interval: 60s
    iir_filter: 2x

# This is for the physical switch on the wall and to allow for control in a HA dashboard
switch:
  - platform: gpio
    pin: GPIO23
    id: bathroom_manual_control 
    name: "Bathroom Fan - Manual Control" # Link to the binary sensor below
    icon: "mdi:fan-clock"

# The physical switch on the wall
binary_sensor:
  - platform: gpio
    pin: 
      number: GPIO33 ## Wire from this pin to the push button on the wall and back to ground on esp32
      inverted: true
      mode:
        input: true
        pullup: true
    name: "Bathroom Fan - Bypass Wall Button"
    icon: "mdi:gesture-tap-button"
    on_press: ## on_press is for a push button switch. on_state is for a toggle switch. Choose on_state or on_press for the type of wall switch you have, you can only use one or the other.
      then:
        - switch.toggle: 
            id: bathroom_manual_control # Link back to the switch above
    filters:
      - delayed_on: 10ms

# For a motion sensor in bathroom
  - platform: gpio
    pin: GPIO19
    name: "Motion Sensor"
    device_class: motion

## You can add another "gpio" on pin 32. This can be used for a door contact sensor. 
## I am not using a door contact sensor it is just there to show you how to use it if you require one. 
## For me I am using this pin for another motion sensor located in the WIR to turn on lights.
  - platform: gpio
    pin: GPIO32
    name: "Bathroom Door"
    device_class: door

The Bathroom Humidity Exhaust Fan Blueprint Settings

Below are the main sensor settings for the automation. I dont have a fan with different speeds so nothing is entered into the 2 “Input - Fan Speed” selections. If you have a fan with different speeds then you would enter them in here. I do use the “Maximum Humidity” in the settings so I have entered in my humidity sensor into “Input - Bathroom Humidity Sensor”.

Below are the main settings. I refer these setting as “Summer Mode” but the are not labelled like that as it is just easer to read this way.

Below is to enable winter mode. I use it but you don’t have to use it as it is an option.

Below are the winter settings.

Below are the light settings. I dont use them as I use my Sensor Light blueprint to control the lights with the “Automation Link Option”.

Below is the manual fan switch settings. This is the switch I created in the ESP32 code and wired to a physical switch on the wall.

Below is the “Automation Link” settings. This will be referred to later when showing my sensor light set up. I have set this to 2 minutes. This allow us to dry ourselves before the motion sensor is able to detect motion again once we move to the other side of the glass shower screen. I have created a toggle helper for this.

I have entered in a by-pass but realy don’t use it now we have developed the manual fan switch.

The Sensor Light Blueprint Settings

Click here for my Sensor Light blueprint.

Below is the main settings. Trigger is the motion sensor under the vanity and in the ESP32. You can see my 3 LED lights entered in. The main light is controlled manually as we use the LED light most of the time and only turn ON the main lights when needed.

The light settings

The by-pass settings. This is where the automation link in the bathroom humidity exhaust fan blueprint controls and takes over this automation disabling it. I have selected to turn the lights ON as this allows it to work without ever knowing anything is happening. Note the by-pass time delay of 1 minute. This allows for when the by-pass is turned OFF for us to trigger this automation again before turning OFF the lights.