Depends on you
Dnr or do not resuscitate means just that.
If you are found unresponsive then do not call a code or begin resuscitative procedures.
No heroic measures need to be defined a little more. I'm a physician and have clearly stated that I do not want to die heroically. And then go on to specify that means I do not want to have expensive treatments to "heroically" keep death at bay. Let me go in peace.