SGP41 NOx conditioning

[petercrona]

It might just be confusion on my side, but I have a question about NOx conditioning.

In

arduino-gas-index-algorithm/examples/exampleUsage/exampleUsage.ino

Line 151 in e187543

sgp41.executeConditioning(compensationRh, compensationT, srawVoc);

NOx conditioning is called with compensationRh and compensationT rather then defaultCompenstaionRh and defaultCompenstaionT.

In the datasheet (https://sensirion.com/media/documents/5FE8673C/61E96F50/Sensirion_Gas_Sensors_Datasheet_SGP41.pdf) it is written:

The conditioning command requires to send default input parameters (2 words + respective CRC bytes).

and an example is given, with 0x80 0x00 0xA2 0x66 0x66 0x93, namely:

sgp41_execute_conditioning: 0x26 0x12 0x80 0x00 0xA2 0x66 0x66 0x93

So, must I use defaultCompensationRh and defaultCompenstaionT, or does it work equally well with compensationRh and compensationT, as in exampleUsage.ino?

[Rol-la]

Hi @petercrona,
Thanks for reaching out. I understand your confusion. The way I read the data sheet I would also conclude that the usage example is wrong and one has to use the default values and not the measured values for RH and T.
I will clarify internally and come back to you.
best,