text: #ifndef BATTERY_H
  #define BATTERY_H
  
  #define BATTERY_MEASURE_NUM               100
  #define BATTERY_VOLTAGE_FACTOR           1.32
  #define BATTERY_CONTROL_INTERVAL   (10 * 1000)
  
  extern float battery_voltage;
  
  extern void  battery_setup(void);
  extern void  battery_measure(void);
  
  #endif
  