# Project: Home Assistant

## Preparing the host

<s>I'll be using a [Raspberry Pi Zero W](https://www.raspberrypi.org/products/raspberry-pi-zero-w/).

To get started, I followed the standard headless-ssh procedure:

### Headless ssh

1. Download the [Raspberry OS image](https://www.raspberrypi.org/software/operating-systems/)
2. Flash using for example [Rufus](https://rufus.ie/) or [balenaEtcher](https://www.balena.io/etcher/)
3. Add a `ssh` file to the boot partition to enable ssh on boot (as per [raspberrypi.org](https://www.raspberrypi.org/documentation/remote-access/ssh/))
4. Idem for `wpa_supplicant.conf` ([docs](https://www.raspberrypi.org/documentation/configuration/wireless/headless.md))

</s>

I wasn't able to get Home Assistant working on the Zero W (ARMv6) and so I switched to a [MinnowBoard Turbot B](https://store.netgate.com/Turbot4.aspx).


### Installing debian

I installed debian using the netinstaller from https://www.debian.org/CD/netinst/

After installation I updated and upgraded the system and installed the openssh-server:

sudo apt update
sudo apt upgrade
sudo apt install openssh-server

Afterwards I added my public key and disable password authentication.

## Docker

To install docker I ran:

sudo apt install \
    apt-transport-https \
    ca-certificates \
    curl gnupg-agent \
    software-properties-common

curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

# Check fingerprint:
sudo apt-key fingerprint 0EBFCD88

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian \
    $(lsb_release -cs) \
    stable"

sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io

## Home Assistant

To install Home Assistant I created a simple docker-compose file as per https://www.home-assistant.io/docs/installation/docker/:

version: '3'
services:
  homeassistant:
    container_name: home-assistant
    image: homeassistant/amd64-homeassistant:stable
    volumes:
      - /home/skippy/hass/config:/config
    environment:
      - TZ=Europe/Brussels
    restart: always
    network_mode: host

To run this on system startup I used a systemd unit:

[Unit]
Description=Home Assistant
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=10s
Restart=no
WorkingDirectory=/home/skippy/hass
ExecStart=/usr/local/bin/docker-compose

[Install]
WantedBy=multi-user.target

On first startup I created a user and I was greated by an empty dashboard:

## MQTT

As the central message broker I chose [Mosquitto](https://mosquitto.org/).

To install it, I simply ran:

apt install mosquitto

And to create the user database and add the relevant users:

mosquitto_passwd -c /etc/mosquitto/passwd hass
mosquitto_passwd /etc/mosquitto/passwd esp_relays
mosquitto_passwd /etc/mosquitto/passwd esp_photoresistor

After registering the MQTT broker with all devices (see below), the topics in a client look something like this:

## Adding some integrations

To add integrations (services Home Assistant can talk to), go to `Configuration > Integrations`:


## ESPHome

Similar to [Tasmota](https://tasmota.github.io/docs/), [ESPHome](https://esphome.io/) is a mini operating system-like firmware for the family of [Arduino](https://www.arduino.cc/), WiFi enabled devices, like the ESP8266 and ESP32. ESPHome uses a python script to craft a custom firmware bin for each of your devices, starting from a yaml config file. Tasmota on the other hand is more of an all-in-one solution. I used ESPHome for this project and created two config files:

`relays.yaml` for an all-in-one relay board:

esphome:
  name: relays
  platform: ESP32
  board: nodemcu-32s

wifi:
  ssid: "<SSID>"
  password: "<PASS>"

  ap:
    ssid: "Desk Fallback Hotspot"
    password: "<PASS>"

captive_portal:

# Enable logging
logger:

mqtt:
  broker: 192.168.1.70
  username: esp_relays
  password: <PASS>

ota:
  password: "<PASS>"


switch:
  - platform: gpio
    name: "Relay 1"
    pin: 33
  - platform: gpio
    name: "Relay 2"
    pin: 25
  - platform: gpio
    name: "Relay 3"
    pin: 26
  - platform: gpio
    name: "Relay 4"
    pin: 27


And `photoresistor.yaml` for an ESP8266 dev board with a photoresistor circuit:

esphome:
  name: dimmer
  platform: ESP8266
  board: thingdev

wifi:
  ssid: "<SSID>"
  password: "<PASS>"

  ap:
    ssid: "Dimmer Fallback Hotspot"
    password: "<PASS>"

captive_portal:

# Enable logging
logger:

mqtt:
  broker: 192.168.1.70
  username: esp_photoresistor
  password: <PASS>

ota:
  password: "<PASS>"

i2c:

ttp229_lsf:

sensor:
  - platform: resistance
    sensor: source_sensor
    configuration: UPSTREAM
    resistor: 32kOhm
    reference_voltage: 1V
    name: Resistance Sensor

# Example source sensor:
  - platform: adc
    id: source_sensor
    pin: A0


I then, after installing ESPHome using pip, uploaded the firmware using:

esphome ... .yaml run

## Dashboard

After adding cards for all the integrations my final [Lovelace dashboard](https://www.home-assistant.io/lovelace/) looks like this: