Environmental Monitor

• Environmental Monitor
  • Data captured
  • Sensors
  • Dependencies
    • Python version
    • Arduino
      • Config
  • Publishing to MQTT
  • Add as sensors to Home Assistant
    • q
    • python
  • Adding sensors to Lovelace Dashboard

Data captured

Data is published to serial bus once per second as a comma delimited string.

Example:

26.70,35,736,1013,-5.91,26421

• Temperature - Celsius
• Humidity - Percent
• Light - Analog value between 0 and 100
• Pressure - Pa
• Altitude - m (Not accurate)
• CRC-16 - checksum of data fields

Sensors

• DHT11 - temperature + humidity
• BMP085 - temperature + pressure
• LDR - light

Dependencies

Python version

pip3 install -r requirements.txt

Arduino

• DHT sensor library
• Adafruit BMP085 Unified

Config

• Serial - 9600
• LDR - A0
• DHT11 - 4

Publishing to MQTT

serToMQTT.py takes the data published by the Arduino and forwards it to an MQTT broker.

It takes the name of the serial port and name of the room it is in as parameters.

python3 serToMQTT.py "192.168.1.111" "/dev/ttyACM0" "livingroom"

An alternative to python is the q version serToMQTT.q

q serToMQTT.q -q "192.168.1.111" "/dev/ttyACM0" "livingroom"

You can subscribe from the command line to confirm your data is publishing to your broker:

mosquitto_sub -h 192.168.1.111 -t "homeassistant/#"

mosquitto_sub -h 192.168.1.111 -t "EnvironmentalMonitor/#"

Add as sensors to Home Assistant

q

MQTT discovery will automatically add these sensors to Home Assistant for you.

python

Discovery is not enabled, you will need to add to configuration.yaml:

sensor:
  platform: mqtt
  name: "livingroomtemperature"
  state_topic: "EnvironmentalMonitor/livingroom/state"
  value_template: "{{ value_json.temperature }}"
  qos: 0
  unit_of_measurement: "ºC"

sensor 2:
  platform: mqtt
  name: "livingroomhumidity"
  state_topic: "EnvironmentalMonitor/livingroom/state"
  value_template: "{{ value_json.humidity }}"
  qos: 0
  unit_of_measurement: "%"

sensor 3:
  platform: mqtt
  name: "livingroompressure"
  state_topic: "EnvironmentalMonitor/livingroom/state"
  value_template: "{{ value_json.pressure }}"
  qos: 0
  unit_of_measurement: "hPa"

sensor 4:
  platform: mqtt
  name: "livingroomlight"
  icon: "mdi:white-balance-sunny"
  state_topic: "EnvironmentalMonitor/livingroom/state"
  value_template: "{{ value_json.light }}"
  qos: 0
  unit_of_measurement: "/100"

Adding sensors to Lovelace Dashboard

To add to a Lovelace dashboard:

entities:
  - entity: sensor.livingroomtemperature
  - entity: sensor.livingroomhumidity
  - entity: sensor.livingroompressure
  - entity: sensor.livingroomlight
show_icon: true
show_name: false
show_state: true
title: Living Room
type: glance