microReticulumTbeam/exercises/14_Power/README.md

Exercise 14: Power (Charging + Visual)

This exercise is intentionally narrow in scope:

• Detect if a battery is present.
• Detect if USB/VBUS power is present.
• Determine if charging is needed.
• Keep charging enabled through AXP2101 PMU settings.
• Flash the PMU charge LED while charging.
• If fully charged, leave LED off (do nothing).

OLED behavior:

• For the first 2 minutes after boot, OLED shows:
  • Exercise 14 Power
  • node name (NODE_LABEL)
  • time (RTC/system time if available, else uptime)
  • charging state and battery stats
• After 2 minutes, it switches to a steady Power Monitor header while continuing live stats.

Meshtastic references used

• src/Power.cpp
  • charging detection path (isCharging(), isVbusIn(), battery checks)
• src/modules/StatusLEDModule.cpp
  • PMU charging LED control via PMU->setChargingLedMode(...)

Build and upload

cd /usr/local/src/microreticulum/microReticulumTbeam/exercises/14_Power
pio run -e ed -t upload
pio device monitor -b 115200