Header files and good practice. Harder than I thought

2

Header files should look like

#ifndef _MY_HEADER_FILE_NAME_H_
#define _MY_HEADER_FILE_NAME_H_

/* include all headers whose types you need */
#include <Arduino.h>

/* define macros */
#define VERSION 0x010203
#define MANIPULATE(x) ((x) + 1)

/* declare global variables */
extern int myGlobalInt;
extern String myGlobalString;
extern char myBuf[1500];

/* declare global functions */
String my_global_function(int a, int b);

#endif /* _MY_HEADER_FILE_NAME_H_ */

And the corresponding cpp file should look like

#include "myHeaderName.h"

/* define global variables once */
int myGlobalInt = 123;
String myGlobalString = "ABC";
char myBuf[1500] = {0};

/* define global functions once */
String my_global_function(int a, int b) {
  return String(a + b);
}

General C/C++ tutorials already cover this, e.g.,

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