DustSensor (by wojked) - adding a CO2 Sensor

[fresh]

Dear Community,

my name is Ben and I am more the mechanical engineer type of guy than a coder.
Anyway, I am very interested the ESP Easy Project and wanted to dive into this world with building myself some cheap air-quality sensors with a small display to use it in different spaces and later on being able to integrate it in a smart-home enviroment.
I stumbled over the "DustSensor" from wojked that had a neat Design and seemed to work with less components.
The tutorial is easy to understand and I think i can do this without big issues.

Sadly there is no CO2 Sensor implemented in his design, so I checked the ESP Easy website if there is some CO2 Sensors that I can use and recognized the MH-Z19 that seemed to have an existing plugin. (https://espeasy.readthedocs.io/en/lates ... ght=MH-Z19)

I asked myself if it is a big deal to use this sensor additionally in the DustSensor-Setup to additionally have the Display of the WEMOS NodeMCU showing also the CO2 Levels.

Would be really nice to get some kick-start into this project from you guys.

Best regards
BEN

[Ath]

Hi Ben,

Both the Dust and CO2 sensors you seem to mention (didn't find "the "DustSensor" from wojked"" but I assume it's a SDS011 or PMSx003 device) are supported in the Climate build, so you can install that on your ESP.

That Climate build has support for OLed screens.

[fresh]

You are 100% right with the SDS011. I will go for the MH-Z19 and try it out.
Hope everything works out fine, otherwise you will here from me soon.

Thanks Ton!

Best
BEN

[wojked]

Hey!

Do not hesitate to also write me if you have any issues.
Let me know how did it go!

Greetings,
wojked

P.S. Kudos to the “lets control it” team!

[bidrohini]

You are 100% right with the SDS011. I will go for the MH-Z19 and try it out.
Hope everything works out fine, otherwise you will here from me soon.

Thanks Ton!

Best
BEN

Hi there. Here I found how to make a CO2 meter with ESPeasy using Senseair S8 sensor. It has some advantages over MH-Z19. I think you'd like to take a look.

https://emariete.com/en/meter-co2-esp82 ... nseair-s8/

By the way, MH-Z19 is good also. With that, you can also make many versatile PCBs like this:

https://www.pcbway.com/project/sharepro ... ector.html

[wojked]

Hey Ben,

It has been a while.
I am experimenting with SCD40/SCD41 (aka SCD4X family of sensors):
- they seem to be affordable
- they use I2C
- they might be a great replacement for the DHT22 as they are smaller and measure also temperature, relative humidity (next to CO2 concentration levels)

[chromo23]

am experimenting with SCD40/SCD41 (aka SCD4X family of sensors):

I use the SCD41 for a while now and did some intensive testing compared to the Mh-Z19 series. I am surprised ho well it works. When calibrated correctly it show the almost the same values (+- 50ppm)
The temp/hum sensor inside is a SHT40 which is ok with typical deviations for humidity. But temp readings only work reliably when the SCD41 is used in power save or single shot mode. Which is totally fine. I use an interval of 30secs. I had to calibrate the temp down 1°C for compensation.
Now compared to some of my BME280 and SHT21 it it very usable...
Finally i can build a battery powered co2 sensor...

[chemmex]

SCD40/41 seems to be the best in class in terms of cost, accuracy and power efficiency