(Sorry if it's in the wrong subforum, I wasn't sure where to put it.)
I've got two hardware questions related to the Adafruit 12-Key Cap touch sensor breakout board.
1) I'm experimenting with the thresholds and noticed that sometimes the LED doesn't just light up a bit, it stays bright red - probably forever, I usually disconnect the whole setup once this happens. AFAIK, nothing I do in programming should affect the LED, that's the internal basic functioning of the device.
2) May be related, though I don't think so. In some of the descriptions I've read (usually talking generally about I2C or the MPR121), a need for pull-up resistors is mentioned. The Adafruit instructions I've seen don't say anything, but since I'm not using an arduino on the othe end (it's a Teensy 3.2), I'm not sure if they would be required or not. I'm assuming that if they're necessary, they're already included in the breakout board, but I want to make sure I'm not doing something wrong. (It does work, after all. Just not very reliable, but that may well be my programming or even soldering.)
Maybe there's a tutorial that'll explain this stuff - if so, please point me towards it. I'm (obviously, I guess) new at this.