#include <Arduino.h> // Load the Arduino core API for Serial, GPIO, delay(), millis(), and analogWrite(). #include <Arduino_GFX_Library.h> // Load Arduino_GFX so the sketch can drive the GC9309 SPI ...

namespace { // Keep lesson constants and helpers private to this file. constexpr uint8_t kBatteryAdcPin = 1; // Use GPIO1 as the battery-divider ADC input. constexpr uint8_t kChargeStatusPin = 15; // ...

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