first off: this is not an openHAB-related topic but I wanted to post anyway because you guys always helped me =) (thanks for that)!
I ordered an Enviro+ sensor board (https://learn.pimoroni.com/tutorial/sandyj/getting-started-with-enviro-plus) to build a Raspberry-based weather station. Assembling was quite easy and I came up with a self-written .py that reads sensor data and sends it to an MQTT broker.
openHAB subscribes to that MQTT broker and integrating the topics into OH works like a charm. Furthermore I’m persisting data in InfluxDB and visualize it in Grafana.
On the Enviro+ board, there’s a MICS6814 sensor for measuring “reducing”, “oxidising” and NH3 gas(es). As the measurements are converted to Ohms I’d like to convert them into PPM to get a better understanding about air quality. Of course you could also monitor the Ohms and track air quality via them, but that’s not what I’d like to achieve.
So my question to all of you, who already did a similar conversion, is how I could tackle this. I’ve found a fact sheet @ https://www.sgxsensortech.com/content/uploads/2015/02/1143_Datasheet-MiCS-6814-rev-8.pdf, but at least the “reducing” graph’s Y-axis only reaches to RS/R0 = 10.
Current readings are:
- redu = 504 kOhm
- oxid = 27 kOhm
- NH3 = 369 kOhm
As always many thanks for your time, have a nice day!