Modified FiveTalk with GPS coordinates, Power has OLED display at outset

exercises/14_Power/README.md

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