VOC algorithm

[itsnils]

Hello I would like to measure the VOC value.
I have too little python i2c experience to realize this.

do you have soon for to insert this VOC algorithm?

thank you very much for your work

[ladyada]

yeah it is not possible at this time because @Sensirion has not release the library code in python only arduino!

[itsnils]

Hello @ladyada
thank you for your answer. You probably meant @Sensirion AG
Too bad the VOC algorithm is still not implemented. I can't use the SGP40 sensor like this with Python.

[ladyada]

correct!

[CrackXT]

Hello everyone, @Sensirion has published the code in python, please have a look here. Link

[AVanVlack]

@CrackXT
I cant seem to find an algorithm in that code base. It looks like it is only commands for communicating with the sensor and getting the raw data. Unfortunately the same as this CircuitPython driver can do now.

I did find that DFRobot has a python algorithm and have a fork of this respiratory with it working on CircuitPython. See code and examples here

I would make a pull request but not sure how Adafruit feels about an algorithm not directly from Sensation.

[ladyada]

sure any PR would be most welcome :)

[Curt-is-Pi]

Looks like the example for the compensated measurements has the '_index' and '_raw' mixed up.

compensated_raw_gas = sgp.measure__index_(temperature=temperature, relative_humidity=humidity

should read

compensated_raw_gas = sgp.measure_raw(temperature = temperature, relative_humidity = humidity)

And

voc_index = sgp.measure_raw(temperature=temperature, relative_humidity=humidity)

should read

voc_index = sgp.measure_index(temperature = temperature, relative_humidity = humidity)

Right?