I’m looking at their products right now. It looks like they have some eCO2 sensors. I"m going to reach out to them and see what they offer. I believe this should work. I need CO2 or equivalent CO2 levels. This sensor should work. Either way, this is a great find and I think it should help out a lot of us looking for a solution like this.
I have tested several sensors, the CCS801, the MICS-VZ-89TE and the MH-Z19, connected to an ESP8286 module running ESPEasy. All are working fine, I just had problem with the CCS801 because I did not proceed with the burn-in procedure properly.
I prefer the MICS-VZ-89TE as it is working with the I2C bus, that can be also directly connected to a Raspberry Pi. I bought 5 of those modules through Aliexpress.
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Thank you for the reply! I’ll check the MICS-VZ-89TE out as well.
Do you have any code examples?
I have code example for the Raspberry Pi and for the ESP8266/32 as module for the ESP Easy framework I can send you directly.
ehm, or you post it here for others to see. 
I have put some examples for the MICS-VZ-89TE here: https://github.com/iot6466/CO2-Sensors
Here the things:
Thing topic rbpt2 "mqtt-rbpt-2" {
Type number : CO2 "CO2" [ stateTopic="/rbpt-2/VZ89/CO2" ]
Type number : VOC "VOC" [ stateTopic="/rbpt-2/VZ89/VOC" ]
}
Thing topic wemos1 "mqtt-wemos-1" {
Type number : CO2 "CO2" [ stateTopic="/wemos-1/VZ89/CO2" ]
Type number : VOC "VOC" [ stateTopic="/wemos-1/VZ89/VOC" ]
Type string : LWT "LWT" [ stateTopic="/wemos-1/status/LWT" ]
}
and the items:
Number VOCBuro "VOC Buro [%.2f ]" (gDatalog,gMonitor) { channel="mqtt:topic:mosquitto:wemos1:VOC" }
Number CO2Buro "CO2 Buro [%.2f ]" (gDatalog,gMonitor) { channel="mqtt:topic:mosquitto:wemos1:CO2" }
String LWTBuro "LWT Buro [%s]" { channel="mqtt:topic:mosquitto:wemos1:LWT" }
Number CO2Wozi "CO2 Wozi [%.2f ]" (gDatalog,gMonitor) { channel="mqtt:topic:mosquitto:rbpt2:CO2", expire="11m" }
Number VOCWozi "VOC Wozi [%.2f ]" (gDatalog,gMonitor) { channel="mqtt:topic:mosquitto:rbpt2:VOC" }
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I am working since nearly 1y successfully with OH and am also interested in such CO2 sensors to extend my possibilities. This connection RPI/ESP8266/MICS-VZ-89TE needs advanced knowledge with soldering and programming as far as I understood, right? So this USB-stick seems to be the better out-of-the-box solution - but this is sold out 
Does anyone have a step by step description for the integration of MICS-VZ-89TE?
Thanks!
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I am using this one: https://www.amazon.de/gp/product/B01EN3M0YS/
It is connected to a RPI, running a Python script that queries the sensor every X seconds and uses the openHAB REST API to report the values.
Script:
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I would be curious how “correct” those $10 USB Sticks are, compared to a solution like this: https://www.air-q.com/
@sidamos: Did you do some comparisons?
No, I did not do comparisons myself. But I read some online review that said that the sensor, that I got from Amazon, is pretty OK.
Is there any chance of getting a little more detailed explanation how to deal with a MICS-VZ-89TE in combination with a esp8285?
at best as an soldered extension to a single channel sonof relais 
that would be wonderful 
I have the MICS-VZ-89TE running on the latest ESPEasy (as of 20-02-21), with @jclugeon’s plugin.
For those who don’t know how to compile this plugin, I have the file here:
https://cloud.hijnn.net/nextcloud/index.php/s/7KfZWRJE8H3WR8o
After 4 days of usage these are the results:
Green is the CO2 measured, blue the VOC.
Orange is a MH19-sensor in my bedroom.
After powering up the sensor it takes a while before the CO2 is measured, until then it stays at 400. There are some “incorrect” readings, but overall the sensor is OK to do some basic ventilation automation.
I have used with good success the sensair S8 together with ESPEASY. I tried before with CCS811 sensors, but found these gave some very strange data frequently.
FYI nice comparison between the 2 sensors. Comparison of CO2 sensors MH-Z19B vs Senseair S8 - eMariete
I remember there is another site that has comparisons of 4-5 different sensors, but could not 123 find it back.
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I use Awair Element to monitor temp, humidity, co2, pm2.5, voc. It seems to be sensitive, accurate, and stable as far as I can tell. Fresh air co2 =400pm. Detects the other half with her creams and potions and quickly detects co2 rise when someone enters the room. It’s not cheap!! It has a phone app and API possibilities. It calibrates when the room is ventilated and has built-in fan to force air over the sensors. The fan is a bit noisy for bedroom use and sensitive ears. Mains powered, no battery
Here is the write-up I made on how to get the data into openhab and Grafana
@marcel_verpaalen, any chance you remember which sensors were tested / compared? Would be highly interested in having a look at the comparison as well / do some search for the site.
Update: You mean this thread?
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Yess that was the one.
As said, I now use sensair S8 and works quite good.
Thanks.
Will either go for this one or the SCD41 (looks even a bit smaller).
Does the S8 involve my calibration? Or is it factory-calibrated and just does it’s job?
I did not do any calibration that I can recall. But it been a long time ago that I activated the device.
In order not to overload this post (which I owe good information) I created this one: Tuya air quality monitor via Zigbee2MQTT.
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