SGP40 Air Quality Sensor on D1 Mini with Tasmota 13.3.0(sensors)

[TMHEINE]

Hi,
how can i get the SGP40-Sensor work on this standart sensor built?
It is connected like here:

And Sensor was found:

What do I have to do to get the sensor information on the main screen?

Thanks in advance

[sfromis]

Check if your I2CDriver command output indicates that index 69 included and enabled. If the sensor is detected (instead of just present on the bus), a message like this should appear shortly after booting.
00:00:00.134 I2C: BMP280 found at 0x76
(Obviously, my example is with a different sensor)

[TMHEINE]

What is the difference between USE_SGP40 or USE_SGP4X? I have a SGP40.
Ordered here:
https://de.aliexpress.com/item/1005004680000599.html

[TMHEINE]

I ordered an other SPG40 from a different company. Same result.
It is not possible do get a SPG40 or SPG41 running withe the Standard-Sensor-Image.
Even in Version 13.4.0.2
Or did I make something wrong?

[barbudor]

What is the result of command 'i2cdriver'?
You should have the number 69 without a !

[TMHEINE]

It is there, for sure without "!"

[TMHEINE]

Does anyone have an SGP40 sensor with the standard sensor firmware in use?

[TMHEINE]

I have now generated a firmware with "#define USE_SGP40 // [I2cDriver69] Enable SGP40 sensor (I2C address 0x59) (+1k4 code)".
The SGP40 was not found.
Then I generated a firmware with "#define USE_SGP4X // [I2cDriver82] Enable SGP41 sensor (I2C address 0x59) (+7k2 code)".
The SGP40 was then found after deactivating the I2CDriver69.
Unfortunately the displayed data

does not match the SGP40 . It should look like this:

If I then connect an SGP41 here, it is recognized correctly:

So in my opinion there is an fault in programm-code.
Maybe someone can find it...

[TMHEINE]

I think it's best to keep an eye on the SGP4x driver as it can actually handle both.
But I have more questions:
-Is it possible to read the temperature and humidity of an SGP40/41?
-SGP40driver is not working anymore, can the SGP4xdriver be placed in the standard sensor-image

[sfromis]

Looks like neither SGP40 nor SGP41 can measure temp/hum, but they can try to adjust the calculations based on the resistance of heated and corroded tin if the driver can supply them with these values.

[TMHEINE]

In my old Project with the SGP40Driver the Abs humidity was shown.
See:

Where is this vaue from?

[sfromis]

That is a calculation when the driver supplied temp/hum, via the Tasmota global temp/hum values, in this case based on the BME280. It can really only measure resistance of heated and corroded tin, nothing more. All else is calculations, based on many assumptions which may not match very well always.

[TMHEINE]

Ok, then it is good for me.
Will the SGP4x driver be used in the Standard-Sensor Image in Future?