== Home Assistant, ESPHome, BMP285 - temperature and pressure monitoring. ==


== List:==
  * raspberry PI 3 or newer [[https://en.wikipedia.org/wiki/Raspberry_Pi|raspberry pi]] - cost about €43.09
  * ESP32 [[https://en.wikipedia.org/wiki/ESP32|esp32]] - cost about €3.5
  * microSD card - cost about €10
  * sensor BMP280 - temperature, pressure [[https://www.bosch-sensortec.com/products/environmental-sensors/pressure-sensors/bmp280/|bmp028]] - cost about €1.5
  * wires to connect ESP32 with BMP280
  * cable to power ESP32 micro usb
  * ethernet cable
  * wifi dongle
  * optional case for esp32 and sensor, I've made one - you can look here https://github.com/karcio/stls/blob/main/esp32_sensor_bottom_v1.scad

Raspberry Pi 3
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ESP32 controller
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BMP280 sensor
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ESP32 custom case
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== Prepare image HAOS: ==
  * download HAOS for your rpi from https://github.com/home-assistant/operating-system/releases/tag/13.0
<code>
https://github.com/home-assistant/operating-system/releases/download/13.0/haos_rpi2-13.0.img.xz
</code>
  * unpack image
<code>
unxz haos_rpi2-13.0.img.xz
</code>
  * insert sd card to your device and check how your machine recognize it - in mine case it is /dev/mmcbkl0
<code>
sudo fdisk -l
</code>
  * flash your sdcard
<code>
sudo dd if=Downloads/haos_rpi2-13.0.img  of=/dev/mmcblk0 status=progress bs=1M
</code>

== First run HA ==
  * insert sd card to RPI
  * connect Ethernet cable
  * insert WIFI dongle to usb port
  * connect power to RPI and wait while for HA to run
  * on your router check your rpi Ip address
  * in web browser insert rpi Ip address with port 8123,  http://your_rpi_ip:8123
  * first create account

== Setup wifi connection on first run:==
  * go to Settings > System > select Network and then wifi tab
  * in ip4 select automatic
  * in WI-FI scan network to find your network and insert SSID and password. Save after that
  * reboot rpi to set up wifi

== Install Add-ons:==
  * go to : Settings > Add-ons
  * click in add and install esphome and File editor
  * esphome allows you to use esp32
  * file editor allows you to edit config files and check syntax

== HA config structure ==
  * configuration.yml
  * automation.yml
  * secrets.yml

== Connect BMP280 to ESP32 ==
  * BMP280 sensor has 6 pins but we use just 4: VCC, GRN, SCL, SDA
  * connet  pins as following:
    * BMP280 VCC -> ESP32 3V
    * BMP280 GRN -> ESP32 GRN
    * BMP280 SCL -> ESP32 D22
    * BMP280 SDA -> ESP32 D21

ESP32 and BMP280 final photos.

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== Connect esp32 to rpi for first initial flash ==
  * connect esp32 using usb cable to rpi do RPI
  * open ESPHome tab
  * click on add new device

this is sample of config file:

<code>
esphome:
  name: esp32-01
  friendly_name: esp32-01

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "xxx"

ota:
  - platform: esphome
    password: "xxx"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Esp32-01 Fallback Hotspot"
    password: "xxx"

captive_portal:

i2c:
  sda: 21
  scl: 22
  scan: True

sensor:
  - platform: bmp280_i2c
    temperature:
      name: "bedroom temperature"
      oversampling: 16x
    pressure:
      name: "bedroom pressure"
    address: 0x76
    update_interval: 60s
</code>

This is how looks sample of automation config

<code>
alias: "Temperature"
description: low temperature level
trigger:
  - platform: state
    entity_id:
      - sensor.temperature
    to: null
    for:
      hours: 0
      minutes: 30
      seconds: 0
condition:
  - condition: or
    conditions:
      - condition: numeric_state
        entity_id: sensor.temperature
        above: 25
      - condition: numeric_state
        entity_id: sensor.temperature
        below: 5
      - condition: numeric_state
        entity_id: sensor.temperature
        below: 0
action:
  - data:
      message: "Temperature is: {{ states('sensor.temperature')}} C"
      title: "Warning: temperature is {{ states('sensor.temperature')}} C"
    action: notify.email_notification
mode: single
</code>

Whole documentation is here: https://www.home-assistant.io/installation/raspberrypi