text: #ifndef UserTypes_h
  #define UserTypes_h
  #include "Arduino.h"
  // User data types.  Modify for your data items.
  #define FILE_BASE_NAME "adc4pin"
  const uint8_t ADC_DIM = 4;
  struct data_t {
    uint32_t time;
    uint16_t adc[ADC_DIM];
  };
  void acquireData(data_t* data);
  void printData(Print* pr, data_t* data);
  void printHeader(Print* pr);
  void userSetup();
  #endif  // UserTypes_h
  