Home Assistant is an open source home automation software which tracks the state of the smart-devices in your home so you don't have to. It easily integrates with most smart-devices (Google Cast, Philips Hue, Nest, Sonos, etc) and even interfaces with smart-assistants like Alexa or Google Assistant. 

Adafruit sells a lot of different types of sensors. Following this guide will let you quickly connect them to Home Assistant using an Adafruit Feather.

We're going to set up an Adafruit Feather ESP8266 with a BME280 sensor to create a temperature, pressure, and humidity logging node. Then we'll install, set up, and configure Home Assistant on a Raspberry Pi.

We'll configure the Feather to broadcast its sensor data to both Home Assistant and Adafruit IO using ESPHomeYAML.

While Home Assistant is fantastic at displaying data in real-time, you might want to manipulate and log the data. We'll be using Adafruit IO to perform real-time and long-term logging for visualization of data, and export the data from sensor feeds.


Angled shot of rectangular microcontroller with headers.
Feather is the flagship development board from Adafruit, and like its namesake, it is thin, light, and lets you fly! We designed Feather to be a new standard for portable...
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Note: While you can run HassOS on a Pi Zero W, we do not suggest using one with this guide. The process of flashing firmware from a Pi Zero W is difficult. Compiling and uploading the Feather's firmware from a Pi Zero W takes significantly more time than a Pi 3B+. 

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NOTE: Due to stock limitations we may only be able to offer refunds or store credit for Pis that are defective, damaged or lost in transit.The Raspberry Pi...
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Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor
Bosch has stepped up their game with their new BME280 sensor, an environmental sensor with temperature, barometric pressure and humidity! This sensor is great for all sorts...
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You'll need the items below for this project. If you do not have them already, grab them from the Adafruit Store:

1 x Switching Power Supply with MicroUSB
5V 2.5A Switching Power Supply with 20AWG MicroUSB Cable
1 x Micro USB Cable
USB cable - USB A to Micro-B - 3 foot long
1 x Breadboard
Half-size breadboard
1 x Wire Bundle
Breadboarding wire bundle

Make the following connections between the Feather Huzzah ESP8266 and the BME280:

  • Feather 3V to BME280 VIN
  • Feather GND to BME280 GND
  • Feather SCL to BME280 SCK
  • Feather SDA to BME280 SDI

You may also want to connect a LiPo battery to the JST connector on the Feather Huzzah for wire-free logging. This one is ideal for Feathers:

Slim Lithium Ion Polymer Battery 3.7v 400mAh with JST 2-PH connector and short cable
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This...
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If you do not already have an Adafruit IO account set up, head over to io.adafruit.com to link your Adafruit.com account to Adafruit IO.

Navigate to the feeds page on Adafruit IO. Then click Actions -> Create New Feed, and name this feed humidity

Then, create a temperature and pressure feed for the BME280's temperature and pressure sensors.

Also, create an additional feed named statusWhen your Feather turns on or off, it'll broadcast its connection status to this feed.

We're also going to need our Adafruit IO username and secret API key.

Navigate to your profile and click the View AIO Key button to retrieve them. Write them down in a safe place, we'll need them for later.

With Adafruit IO set up, we'll move on to installing HassOS

We'll be installing Home Assistant locally on a Raspberry Pi using Hass.io, an All-in-One image which turns your Pi into a home assistant hub.

The process of installing and configuring HassOS takes a while. Luckily, you only have to do it once.

First, download the latest Hass.io image for your device from the home assistant downloads page.

Then, unzip the .img.gz file. You should now have a .img file.

Burn the OS image to a fresh SD card (Home Assistant's website suggests a 32GB SD card or larger). 

WiFi Configuration

If you want to connect your Pi over WiFi, you'll need to configure Hass first. HassOS uses NetworkManager to control the host network and defaults to ethernet. 

HassOS uses a USB Drive to load configuration files like WiFi onto the Pi. The capacity of the stick does not matter - we'll be adding one file to the drive. 

We'll be overwriting the contents of the USB Drive, so back up the contents of the drive before you proceed further. 

Plug the USB drive into your computer and reformat it with the following settings:

  • Rename the drive to CONFIG
  • Format the drive as MS-DOS (FAT32)

Once reformatted, make a folder on the drive named network

Then, create a new file called my-network inside the network folder we just created.

Copy and paste the following into the file:


# Uncomment below if your SSID is not broadcasted




In the configuration, change ssid to your network's ssid and change psk to the password of your network.

If you don't want the IP address of your Pi to change on every bootup - visit this page to generate a UUID and replace uuid in the configuration with the value from the website.

Save the file to the USB drive and eject the drive from your computer. Safely eject the SD card from your computer at this time, too.

HassOS Setup

Make sure the Pi is unplugged from power.

Insert the SD card with HassOS into the Pi. Then, plug the USB drive into one of the Pi 3B+'s USB ports.

Plug the Pi in to the power supply to power it on.

Home Assistant will take from 15-20 minutes to load up on first boot. Grab a  coffee and browse adafruit.com for awhile.

Once some time has passed, navigate to hassio.local:8123.


You'll eventually be greeted with a welcome screen. Set up a new user account (this is a local account on the Raspberry Pi) and click Create Account.

After setup, you'll be directed to the Home Assistant login page. Remove the USB drive from the Raspberry Pi.

Next, we'll configure Home Assistant to be used with the Feather.

HassOS requires a bit of configuration before it's ready to be used with the Feather.

From the Home Assistant sidebar, click on Hass.io

Home Assistant uses a YAML file named configuration.yaml for each component used by Home Assistant. Previously, editing this file involved setting up SSH or SAMBA sharing on the Raspberry Pi.

We're going to use an add-on which lets us edit this file right from our browser.

From the Hass.io screen, click Add-on Store. Click Configurator.

On the configurator page, click Install. 

The installation takes a while depending on your internet speed. Once the loading circle over installs disappears, the add-on is installed.

Next up, we need to install ESPHomeYAML. Since we're using a community project, ESPHomeYAML, we'll want to add the ESPHome repository to Hass.io.

Under Repositories -> Add new repository by URL, add the ESPHome repository

After the repository has been added, scroll down the page and click on esphomeyaml

From the esphomeyaml add-on page, click Install

Once installed, esphomeyaml should appear on the Hass.io dashboard page along with the configurator we installed earlier. 

Configuring Add-ons

While the Configurator and esphomeyaml add-ons are installed, they need some configuration. We'll start with the Configurator add on. 

From the Dashboard, click the Configurator add-on. You'll be presented with its description, some settings (such as when it updates, when it starts) and the configuration. We'll want to change the password from null to a value enclosed by quotes. 

For example, change password from:

"password": null,


"password": "feather",

Then, click save

Next, we'll need to add our IP address to the allowed_networks section of the configuration file. 

Under the two preconfigured IP addresses, add your computer's IP under allowed_networks enclosed in quotations. 

Then, Click Save

After you've configured both the IP and the password, click Start. A button to Open Web UI will appear when the Configurator successfully starts.

Click Open Web UI

From the new tab, enter the username and password we specified in the Config.

In the Configurator editor, make sure the file you are editing is /config/configuration.yaml.

Then, add an entry in the configuration.yaml file to enable MQTT Discovery:

# MQTT Discovery
  discovery: true
  discovery_prefix: homeassistant

and Click Save.

After saving, navigate back to the Home assistant dashboard

From the sidebar, click Configuration

From Configuration, click General.

Since we changed the configuration.yaml, we'll want to validate the file to make sure nothing goes wrong when we restart Home Assistant. 

Click Check Config

If everything checks out, a message will pop up displaying Configuration valid!

After checking the configuration, we'll want to restart the server. We don't need to SSH into the Raspberry Pi and issue a restart command - Home Assistant lets us do this from within the Configuration page.

From the Configuration page, scroll down to Server Management and click Restart.

If you refresh the page, you'll encounter a Connection lost. Reconnecting... message. Since we restarted the server, it'll take a few minutes to get itself back online.

After a few minutes, refresh the page.

Once we're connected back to HassOS, we'll proceed to configuring the Feather with ESPHomeYAML.

Flashing firmware with Raspberry Pi

ESPHomeYAML is a tool which creates custom firmware for ESP8266/ESP32 boards and sensors from a Yet-Another-Markup-Language (YAML) file. We're going to be using the official Home Assistant add-on for ESPHomeYAML to help generate firmware for the Feather. Then, we'll upload the firmware directly to the board.

Note: If you are using any single-board computer slower than a Pi 3, such as a Pi Zero, expect to wait a significant amount of time while the firmware compiles and uploads to the Feather Huzzah. 

Plug the Feather into a USB Cable, and then into one of the Raspberry Pi 3B+'s USB ports.

Since we'll be compiling and uploading the firmware directly from the Pi to the Feather, we'll connect the two before we begin.

Plug the Feather into a Micro-USB Cable, and then into one of the Raspberry Pi 3B+'s USB ports.

From the esphomeyaml add on page, click Start.

Once ESPHomeYAML is finished installing, a new button will appear Open Web UI.

Click Open Web UI

From the ESPHomeYAML dashboard, click the Plus Icon to launch the ESPHome Setup Wizard. 

The ESPHomeYAML wizard will walk you through setting up a ESP-powered device using ESPHome. 

  • First, name your device. If you're hooking up a lot of smart-devices to Home Assistant - make it as descriptive as possible.
  • Then, select Adafruit HUZZAH ESP8266 as the Device Type
  • Enter the WiFi SSID and password for your network.
    • You can also configure a password for performing Over-the-Air (OTA) updates at this step. This'll allow you to connect to the Feather Huzzah from Home Assistant without connecting a USB cable, and flash firmware to it. 
  • You're done with setup! Click Submit

After the setup wizard completes, a new node will appear on the ESPHome dashboard. We're not ready to upload the settings yet.

Click Edit

The feather_bme280.yaml file below is based off of the template provided in Boris Hajduk's guide `Using adafruit.io MQTT with esphomeyaml`

Copy and paste the file below into the ESPHome Dashboard file editor:

# ESPHomeYAML Configuration
# for Home Assistant and Adafruit IO

  device_name: feather_bme280
  update_interval: 30s

  name: ${device_name}
  platform: ESP8266
  board: huzzah

# WiFi Configuration
  ssid: 'YOUR_SSID'
  password: 'YOUR_SSID_PASSWORD'
  # Uncomment this for Static IP Configuration
    # Set this to the IP of the ESP
    # Set this to the IP address of the router. Often ends with .1
    # The subnet of the network. works for most home networks.

# Adafruit IO MQTT Setup
  broker: 'io.adafruit.com'
  username: ${io_username}
  password: ${io_key}
  topic_prefix: '${io_username}/feeds'
    topic: ${io_username}/feeds/status
    payload: Online
    topic: ${io_username}/feeds/status
    payload: Offline

# Enable Home Assistant API

# Enable OTA Access

# Enable verbose logging over serial

# Create BME Sensor on I2C
  sda: SDA
  scl: SCL
  scan: False
    - platform: status
      name: "BME280 Status"
      id: status
      internal: True
  - platform: bme280
    address: 0x77
      name: "BME280 Temperature"
      id: temperature
      state_topic: ${io_username}/feeds/temperature
      discovery: False
      filters: []
      name: "BME280 Pressure"
      id: pressure
      state_topic: ${io_username}/feeds/pressure
      discovery: False
      filters: []
      name: "BME280 Humidity"
      id: humidity
      state_topic: ${io_username}/feeds/humidity
      discovery: False
      filters: []
    update_interval: ${update_interval}

Before uploading the file, we'll need to make the following adjustments to the YAML file under substitutions:

  • Change device_name to reflect the name of the device you created in the ESPHome Wizard.
  • Set io_username to your Adafruit IO Username
  • Set io_key to your Adafruit IO Key
  • Change update_interval to the frequency (in seconds) which you'd like the feather to read the sensor and send its data to Home Assistant and Adafruit IO.

We'll also need to configure the WiFi network:

  • Set ssid to your network's ssid
  • Set password to your network's password

After configuration of the YAML file is complete, click save.

After uploading, we'll need to check the YAML configuration. From the ESPHome Dashboard, click Validate

If everything is OK, the dialog will display INFO Configuration is Valid!

Finally, we'll move onto uploading the firmware to the ESP8266. 

On the top right corner of the ESPHome Dashboard, make sure you have selected the USB to UART Bridge Converter and not OTA (over-the-air).

The ESPHome Add-On is not capable of discovering new USB ports after the Add-On has started. If you started the application before plugging in the Feather, restart the Add-On before proceeding with this step.

Under the settings for the Feather, click UPLOAD.

This will compile the firmware for the Feather and upload it over USB.

Since we're compiling firmware from the Raspberry Pi, this process will take a while to complete.

If everything compiles and uploads successfully, the Feather on the ESPHomeYAML dashboard will display as Online.

Flashing firmware using the Command Line

You can also flash firmware from the command line by following the instructions on the esphomeyaml Getting Started documentation

Note: To use the PlatformIO Python dependency required by esphomeyaml CLI - you'll need to install Python 2.7.9. If you don't want to mess with multiple installations of Python on your computer - you can install this version through PyEnv.  

Viewing data with Home Assistant 

From the Home Assistant sidebar, click Configuration

Then, click Integrations.



Scroll down to Set up a new integration, find ESPHome and click Configure 

Set the Host to the device_name you configured during the YAML configuration and set the Port to 6053 (default for ESPHomeYAML).

Home Assistant should attempt to connect to the Feather.

After connecting, the feather with BME280 will appear under Configured with three icons for the three types of data the BME280 sensor produces - humidity, pressure, and temperature.

Navigating to the Home page should bring up the dashboard with the BME280 temperature, pressure, and humidity displayed. 

Logging Sensor Data with Adafruit IO

Data from the Feather Huzzah sensor is also sent to Adafruit IO every updated_interval seconds.

You can view this data in real-time from the Adafruit IO monitor page:

You can also create an Adafruit IO Dashboard with line graphs to visualize the data from the sensor over multiple weeks.

Exporting Adafruit IO Data

If you would like to download all of the stored data from a feed (the BME280's temperature data, for example), you can do so by following this guide.

This guide was first published on Feb 07, 2019. It was last updated on Feb 07, 2019.