Enviroplus: MiCS-6814 + Raspberry PI 3B+

[cristian_camilo]

Hello,

I’m developing a project based on the gas.py example in the enviroplus library. And I’m some confused, I would like to know if the resistance value given by the code for each gas (Oxidising, Reducing and NH3) is the Rs, R0 or the Rs/R0 rate.

I think I can use the logarithmic expression to get the ppm value according to the Rs/R0 ratio. But I’ve read about a calibration that I must do for R0, I really don’t have more information about it.

I would greatly appreciate if you could help me with some information about this.

Thank you so much,

Cristian Medina.
Bogotá, Colombia.

[Crowbot]

Welcome!

Do a search on “Enviro”. And check out this thread, which may have your answer.

Enviro+ / Ohms to PPM

Hi there, have my Enviro+ up and running and set up a custom .py to read values and send them to MQTT. From there on I further use the values in openHAB (Smarthome). My question is about the Enviro+’ MICS6814 sensor. Right now it reads… 566 kOhm redu 25k kOhm oxid 369 kOhm NH3 Is there a chance to convert these resistances to PPM? I’ve stumbled upon a data-sheet (https://www.mouser.fi/datasheet/2/18/1143_Datasheet-MiCS-6814-rev-8-1144828.pdf) where there are diagrams for RS/R0 over PPM, but…

Good luck with the project.