Internal pullups are very weak, for a medium/long cable you want a stiffer pullup, say in the 1k to 4k7 range. The internal pullup is really just for stuff on the same pcb, not signals coming in from the big bad EMI-strewn world.
Internal pullups are very weak, for a medium/long cable you want a stiffer pullup, say in the 1k to 4k7 range. The internal pullup is really just for stuff on the same pcb, not signals coming in from the big bad EMI-strewn world.