CCS811 CO2 sensor

[RenedeH]

I managed to get the CCS811 (on the cjmcu-8118 board) working with ESPeasy-mega. I use the wemos d1 mini and compiled the ESPEasy with the _P118_CCS811.ino plugin on the ArduinoIDE. I use Domotiz to follow the data and look at the trend. I also use a DHT11 to get the temperature and moisture readings to compensate.
When I power up the sensor the first reading is 400ppm. It slowly goes up and gets up to a relative stable value , but after a couple of hours the data freezes and when I check the espeasy log it reads 'CCS811 : No values found'. Only solution is power off and on. I tried different reading times and interval, but no improvement.

Anyone a suggestion on how to tackle this?

[Barb232]

Same problem here, i used tasmota, got the same error after 6hs.

[grovkillen]

Interested in Senseair S8 sensors?

I will ship one per each enclosure: viewtopic.php?t=5973

[RenedeH]

Some more googling revealed the possibility that the freezing is caused by the I2c clockstretching issue between the CCS811 and the Wemos. In the ESPEasymega version I use there is in the advanced section the setting I2c clockstretchlimit. I could not find anything on this parameter. The CCS requires a clockstretch value of '500'. Not sure how that works with the limit parameter. Anyone a hint?

[RenedeH]

I did tried the clock strech limit setting in the advanced section of the ESPEasy-mega and chnaged the 0 to 460 and that did the trick. The sensor is running for 2.5 days already. There are a few ' no values found' errors, but they do not stop the unit from working. Hope this helps others with similar issues.