Arduino struct

struct myBits{  //struct uses only 2 bytes of memory 

  uint16_t ison:1;   //1 bit  
  uint16_t address:4 //4 bits  
  uint16_t locked:3  //3 bits
  uint16_t date:5    //5 bits
  //				   ----- +
  //                   13 bits
};

Source: forum.arduino.cc

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