jaredwolff
Back to this, the SCL line is toggling though?
I recall seeing that, yes (edit: though now I’m questioning myself after you asked).
If you put the particle board on a breadboard, do both (SDA & SCL pins) toggle?
Yes. I am now testing this with 3 different Argons and 2 different Xenons. I also dug out a breakout board for the HPMA and another I2C temp/humidity sensor (though not an Si7021) and together with the CCS811 breakout board I mentioned above I recreated the AQW on a breadboard. This works, including the code for listing I2C devices from above.
There is definitely something wrong with the AQW board.
On a sidenote, I use 2.2k or 4.7k resistors as pullups for the I2C lines, usually. Isn’t 20k a little high, especially if someone were to power the Argon off a battery?
