Hello
I discovered an easy way to get the data of an BME680 air quality sensor to the openHAB system. The nice thing about this sensor is that it has a gas sensor which can give you an indication how good the air quality is. The higher the resistance of the sensor, the better the quality.
Here I want to share the solution how it can be done:
Prerequisites:
- Sonoff Basic flashed with tasmota(sensors). I testet R1 and R2. R1 might be the better choice because the sensor went offline after some time when I tried it with R2.
- BME680 Sensor
- minimal soldering skills
- running MQTT broker
- OpenHAB MQTT binding and JSONPATH transformation
Prepare your Sonoff Basic
#1 flash the device with tasmota-sensors Firmware
You can use the tasmota webinstaller.
#2 connect your BME680 with the Sonoff Basic device
See here: BME680 wiring
Configure your Sonoff Device
#1 module parameters
When everything is working, it should look like this.
#2 mqtt settings (you have to costomize the host and userdata to your needs)
OpenHAB configuration
#1 create MQTT Thing
Bridge mqtt:broker:mosquitto "Mosquitto" [ host="localhost", port=1883, secure=false, username="youruser", password="yourpassword" ]
// Sonoffs
mqtt:topic:tasmota_5545AD_Test "Sonoff Basic" (mqtt:broker:mosquitto) {
Channels:
Type switch : power "Power" [ stateTopic="stat/tasmota_5545AD/POWER", commandTopic="cmnd/tasmota_5545AD/POWER" ]
Type number : rssi "WiFi Signal Strength" [ stateTopic="tele/tasmota_5545AD/STATE", transformationPattern="JSONPATH:$.Wifi.RSSI"]
Type number : temperature "Temperature" [ stateTopic="tele/tasmota_5545AD/SENSOR", transformationPattern="JSONPATH:$.BME680.Temperature"]
Type number : humidity "Humidity" [ stateTopic="tele/tasmota_5545AD/SENSOR", transformationPattern="JSONPATH:$.BME680.Humidity"]
Type number : pressure "Pressure" [ stateTopic="tele/tasmota_5545AD/SENSOR", transformationPattern="JSONPATH:$.BME680.Pressure"]
Type number : gas "Gas" [ stateTopic="tele/tasmota_5545AD/SENSOR", transformationPattern="JSONPATH:$.BME680.Gas"]
}
#2 create items
Group gSonoff_Sensor "Sonoff" ["Sensor"]
Switch GF_Sonoff_Sensor_Power "Power" (gSonoff_Sensor) {channel="mqtt:topic:tasmota_5545AD_Test:power"}
Number:ElectricResistance GF_Sonoff_Sensor_RSSI "WiFi Signal Strength [%d %%]" (gSonoff_Sensor) {channel="mqtt:topic:tasmota_5545AD_Test:rssi"}
Number:Temperature GF_Sonoff_Sensor_Temperature "Temperature [%.1f]" (gSonoff_Sensor) {channel="mqtt:topic:tasmota_5545AD_Test:temperature"}
Number:Dimensionless GF_Sonoff_Sensor_Humidity "Luftfeuchte [%.1f %]" (gSonoff_Sensor) {channel="mqtt:topic:tasmota_5545AD_Test:humidity"}
Number:Pressure GF_Sonoff_Sensor_Pressure "Luftdruck [%d hPa]" (gSonoff_Sensor) {channel="mqtt:topic:tasmota_5545AD_Test:pressure"}
Number GF_Sonoff_Sensor_Gas "Gas [%.1f]" (gSonoff_Sensor) {channel="mqtt:topic:tasmota_5545AD_Test:gas"}
#3 widget template:
widget code
uid: bme680
tags:
- community
- bme680
props:
parameters:- description: The name of the sensor
label: Title
name: title
required: false
type: TEXT - context: item
description: The Sonoff equipment group (prefix of the point item names)
label: Item
name: gitem
required: false
type: TEXT
parameterGroups: []
timestamp: Sep 18, 2022, 12:41:22 PM
component: f7-card
config: {}
slots:
default: - component: f7-block
config:
style:
align-items: start
border-radius: var(–f7-card-expandable-border-radius)
box-shadow: 5px 5px 10px 1px rgba(0,0,0,0.1)
background-color: ‘= (Number.parseFloat(items[props.gitem + “_Gas”].state) < 100) ? “rgba(139,0,0,0.5)”:(Number.parseFloat(items[props.gitem + “_Gas”].state) < 150) ? “rgba(255,69,0,0.5)”: (Number.parseFloat(items[props.gitem + “_Gas”].state) < 200) ? “rgba(255,165,0,0.5)”: (Number.parseFloat(items[props.gitem + “_Gas”].state) < 250) ? “rgba(238,238,0,0.5)”: (Number.parseFloat(items[props.gitem + “_Gas”].state) < 350) ? “rgba(173,255,0,0.5)”: “rgba(0,255,0,0.5)”’
display: flex
flex-direction: column
min-height: 150px
slots:
default:
- component: Label
config:
style:
color: black
font-weight: bold
margin: 5px
text-shadow: 0px 0px 3px white
text-transform: uppercase
text: =props.title
- component: oh-link
config:
action: analyzer
actionAnalyzerItems: =[props.gitem + ‘_Gas’]
color: black
iconF7: chart_bar_circle
iconSize: 24
style:
font-size: 24px
text-shadow: 0px 0px 3px white
text: ‘= (Number.parseFloat(items[props.gitem + “_Gas”].state) < 100) ? “very bad”:(Number.parseFloat(items[props.gitem + “_Gas”].state) < 150) ? “bad”: (Number.parseFloat(items[props.gitem + “_Gas”].state) < 200) ? “ok”: (Number.parseFloat(items[props.gitem + “_Gas”].state) < 250) ? “good”: (Number.parseFloat(items[props.gitem + “_Gas”].state) < 350) ? “very good”: “excellent”’
- component: oh-link
config:
action: analyzer
actionAnalyzerItems: =[props.gitem + ‘_Temperature’]
color: black
iconF7: thermometer
style:
text-shadow: 0px 0px 3px white
text: =items[props.gitem + ‘_Temperature’].state
- component: oh-link
config:
action: analyzer
actionAnalyzerItems: =[props.gitem + ‘_Humidity’]
color: black
iconF7: drop
style:
margin-left: 2px
text-shadow: 0px 0px 3px white
text: =items[props.gitem + ‘_Humidity’].state
- component: oh-link
config:
action: analyzer
actionAnalyzerItems: =[props.gitem + ‘_Pressure’]
color: black
iconF7: speedometer
style:
margin-left: 2px
text-shadow: 0px 0px 3px white
text: =items[props.gitem + ‘_Pressure’].state
- description: The name of the sensor
Thanks to the open source community 
Feedback welcome.
BR
flash it and take a look, get back to us afterwards:)