SVM30 to measure CO2

I want to measure CO2 for grow room. I have SVM30 which give me

CO2 equivalent : 430,
TVOC : 6,
H2_signal : 13028,
Ethanol_signal : 18663,
Humidity : 45.13,
temperature : 22.48,
absolute humidity : 9.00
CO2 equivalent baseline : 0x8ED4,
TVOC baseline : 0x8A17

How can I use these measure to calculate CO2 for grow room ?

430ppm doesn't seem unreasonable in an indoor space. What do you get if you take it outside?

Outdoor :

CO2 equivalent : 400, TVOC : 0, H2_signal : 13427, Ethanol_signal : 18880, Humidity : 55.81, temperature : 8.49, absolute humidity : 4.76 CO2 equivalent baseline : 0x0, TVOC baseline : 0x0
CO2 equivalent : 400, TVOC : 0, H2_signal : 14227, Ethanol_signal : 19455, Humidity : 49.55, temperature : 7.89, absolute humidity : 4.07 CO2 equivalent baseline : 0x0, TVOC baseline : 0x0
CO2 equivalent : 413, TVOC : 0, H2_signal : 14264, Ethanol_signal : 19599, Humidity : 42.46, temperature : 7.43, absolute humidity : 3.38 CO2 equivalent baseline : 0x95F1, TVOC baseline : 0x970E
CO2 equivalent : 608, TVOC : 44, H2_signal : 14163, Ethanol_signal : 19583, Humidity : 42.27, temperature : 7.21, absolute humidity : 3.32 CO2 equivalent baseline : 0x9614, TVOC baseline : 0x9709
CO2 equivalent : 1089, TVOC : 144, H2_signal : 13876, Ethanol_signal : 19521, Humidity : 40.83, temperature : 6.97, absolute humidity : 3.16 CO2 equivalent baseline : 0x9658, TVOC baseline : 0x96E7

(Moved to) Indoor :

CO2 equivalent : 3777, TVOC : 1023, H2_signal : 13278, Ethanol_signal : 18847, Humidity : 72.66, temperature : 10.81, absolute humidity : 7.18 CO2 equivalent baseline : 0x9657, TVOC baseline : 0x96E1
CO2 equivalent : 4470, TVOC : 1819, H2_signal : 13170, Ethanol_signal : 18668, Humidity : 83.62, temperature : 13.33, absolute humidity : 9.67 CO2 equivalent baseline : 0x9655, TVOC baseline : 0x96DC
CO2 equivalent : 4606, TVOC : 1999, H2_signal : 13142, Ethanol_signal : 18616, Humidity : 77.00, temperature : 16.10, absolute humidity : 10.55 CO2 equivalent baseline : 0x9654, TVOC baseline : 0x96D6
CO2 equivalent : 4643, TVOC : 2102, H2_signal : 13134, Ethanol_signal : 18584, Humidity : 67.69, temperature : 17.83, absolute humidity : 10.29 CO2 equivalent baseline : 0x9653, TVOC baseline : 0x96D0
CO2 equivalent : 4775, TVOC : 2253, H2_signal : 13111, Ethanol_signal : 18556, Humidity : 61.44, temperature : 18.99, absolute humidity : 10.00 CO2 equivalent baseline : 0x9652, TVOC baseline : 0x96CB

Dont know why initially when it starts it give CO2 equivalent in 400 range, then it jumps to 4k-6k.
I have connected SVM30-J to 5V of ESP32.

Have you carefully followed the instructions in the SVM30-J user manual?

Yes

  • connected to 5V pin
  • RH/T sensor is on top

Anything I am missing ?

Undoubtedly, but you have not provided enough information for any of us to even guess what that might be. Please read and follow the instructions in the How to use this forum post.

In general, the only way to verify that a sensor is working correctly and giving sensible readings is to test it under known conditions. For example, if you have a temperature sensor, verify that it reports 0 degrees Celsius in an ice water bath.

For an environmental gas sensor, you need to either make up a standard gas mixture for testing and calibration, or compare the readings produced by your sensor with those of a certified commercial instrument. You can pay someone to do that for you.

Hello,
I like to renew and extend the discussion because it seems there are some experts with experience in SGP30 sensors in place. :slight_smile:

The SVM30 is running well and I see the data on serial monitor like rp346. As next step I'like to save theses data on a SD card (additional RTC/SD shield). Goal is to write TimeStamp and data of eCO2, tVOC, T, rF on SD card.
So I loaded the RTClib, SD lib and SVM30 lib and these components stand-alone running ok! Combination RTC and SC is ok as well.
But in combination with SVM30 the system can't open the file on SD card.

Did anyone of you had some experience with saving the SVM30 data on SD card?

Please ask the moderator to split this off and start a new thread.

While you are waiting, please read and follow the instructions in the "How to use this forum" post. Post the code, using code tags, any error message, and a wiring diagram.

Describe the problem clearly ("can't open file" is not helpful).