Trill Craft incomplete channel readings

eventuate

hello!

i'm working with Trill Craft in a couple of different scenarios: one on a breadboard with a regular raspberry pi, and another with a pcb touchplate + circuit + rpi pico

in both cases with two different Trill Craft units, i've verified that i2c is working and continuity is established between touch point and the Craft, but i'm only getting readings from certain touches/channels.

this is both with the general-print example from the linux library, and with a partial library for pico built by another user here. i'm attempting to get a port of the full Trill-Linux library with modified i2c.h that's running into some issues (one thing at a time), but i'm wondering if i'm missing something more fundamental here.

thanks for the help!

giuliomoro

Look at the RAW readings instead of differential: they are probably saturated on those pads where you don't get readings. That means you have to increase the prescaler so that they don't saturate. See here https://learn.bela.io/using-trill/settings-and-sensitivity/

eventuate

giuliomoro thanks so much, that tracks with what i have seen + definitely seems simple enough!

i'll tweak what i've got running over here and will report back if i have continued troubles or success ~