﻿Connector,Pin,Net,Candidate contract
J3,1,CTRL_3V3,Panel pull-up 10k 1% and 3V3-compatible indicator only
J3,2,GND,Panel common ground
J3,3,KEY_IN,Power switch shorts to GND; existing R9=10k pull-up
J3,4,USER_ADC,Plus: switch+10k 1% to GND; minus: switch+22k 1% to GND; common 10k 1% pull-up to CTRL_3V3; optional 10nF at ADC node
J3,5,USER_LED,Existing indicator only; not suction percentage display
J5,1,CTRL_3V3,3V3 display supply; actual regulator/load/inrush budget unverified
J5,2,GND,Display ground
J5,3,PANEL_SCL,PA6/U5.13 software I2C open-drain; external 4.7k pull-up to 3V3 candidate; not hardware I2C AF
J5,4,PANEL_SDA,PA7/U5.14 software I2C open-drain; external 4.7k pull-up to 3V3 candidate; not hardware I2C AF
