UPS input comes from the ignition-switched socket via a 15 V PD
trigger, so input loss means cranking or ignition off. The INA219
(monitor-only) gives the battery current sign; a host service would mark
cranks, then after a grace period close the recording and power off,
with a voltage floor as backstop. Records the open hardware problem:
after poweroff the UPS keeps the board powered, so it drains and
doesn't auto-start at ignition on.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mikkeli
mikkeli