Is anyone successfully using the MICS6814 Breakout?
I’ve got it hooked up to a NodeMCU/ESP2866 (after many hours of stumbling around with code - thank god for Chris’s Arduino port of IOExpander)
However, my resistances don’t seem right compared to what others are reporting on their Enviro+
The breakout says 3-5v compatible, not sure how that works, doesn’t the sensor heaters require specific voltages? I have it on 3.3v currently.
My current reported resistances (using the formula r = (r * 56000/)(vadc - r) which I assume is correct as the PCB seems to have 3 56K resistors for the reading circuitry:
Reducing: 16K Ohms
NH3: 66K Ohms
Oxidising: 233K Ohms
Which seems to be reversed for what others report where Oxidising is typically the lowest and Reducing the highest. That would tie in with the sensor spec sheet.
Both my Oxidising and Reducing are outside the ranges the Spec Sheets says you should see at 23c 50% Hum, which is roughly what my room is at.
At the end of the day it won’t matter if the sensor is still sensitive to gas and I start to calculate a ratio to R0.
I’m currently running it with a BME280 to get some data to run regressions analysis to compensate for Temp/Hum/Baro based on the great work that @Roscoe27 has done.
Still need to get my head around that and how best to get calibration values with ESPHome/Home Assistant.
But first I wanted to check my sensor is running right.