[FR] Detect if no piezo element is plugged in to the PCB header. about pyr0piezo HOT 3 CLOSED

Detecting a piezo disk plugged in is very doable, but it may not be possible to detect whether the disk is damaged. Being able to halt the system if the piezo becomes unplugged is definitely a required safety feature I believe, however.

No polling should be required when using interrupt pins. I'll set up one of the unused pins as a pullup input, and have that get pulled to ground when the piezo is attached. If the piezo is unplugged, the pin will go high and can set an error state that will keep the system in a "triggered" state until the issue is fixed, which should prevent the printer from damaging itself

from pyr0piezo.

Created new board revision v2.2.x for this feature, as it requires changing a header and attaching a new pin to the MCU

from pyr0piezo.

added in a9d9288

from pyr0piezo.