Standalone panel ui/vesc_panel.{html,js,css} with live CAN telemetry
via rosbridge. Subscribes to /vesc/left/state, /vesc/right/state
(std_msgs/String JSON) and /vesc/combined for battery voltage.
Features:
- Canvas arc gauge per motor showing RPM + direction (FWD/REV/STOP)
- Current draw bar (motor + input), duty cycle bar, temperature bars
- FET and motor temperature boxes with warn/crit colour coding
- Sparkline charts for RPM and current (last 60 s, 120 samples)
- Battery card: voltage, total draw, both RPMs, SOC progress bar
- Colour-coded health: green/amber/red at configurable thresholds
- E-stop button: publishes zero /cmd_vel + /saltybot/emergency event
- Stale detection (2 s timeout → OFFLINE state)
- Hz counter + last-stamp display in header
- Mobile-responsive layout (single-column below 640 px)
- WS URL persisted in localStorage
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
