Arduino Sketch too Big; How to Shorten it?

Projects Programming
106

Combining these makes a fun little test sketch:

#define arrSize(X) sizeof(X) / sizeof(X[0])

int course = 225;
int target = 135;

int bearings[] =               { 0,    22.5,  45,   67.5,  90, 112.5,  135,  157.5, 180,  202.5, 225,  247.5, 270, 292.5,  315, 337.5, 360 };
const char* bearingStrings[] = { "N", "NNE", "NE", "ENE", "E", "ESE", "SE",  "SSE", "S",  "SSW", "SW", "WSW", "W", "WNW", "NW", "NNW", "N" };

void turnLeft() { Serial.println("Left"); }
void turnRight() { Serial.println("Right"); }

// returns the array element ID for the nearest bearing to the target number
int nearestBearing(int target) { 
  int idx = 0; // by default near first element
  int distance = abs(bearings[idx] - target);
  for (int i = 1; i < arrSize(bearings); i++) {
    int d = abs(bearings[i] - target);
    if (d < distance) {
      idx = i;
      distance = d;
    }
    else return idx;
  }
  return idx;
}

void setup() {
  Serial.begin(9600);
  Serial.println((String)"Current course is: " + bearingStrings[nearestBearing(course)] + " (" + course + " degrees)");
  Serial.println((String)"Target course is: " + bearingStrings[nearestBearing(target)] + " (" + target + " degrees)");
  Serial.print("Suggested movement: ");
  int dif = target - course < 0 ? (360 + target - course) : (target - course);
  dif < 180 ? turnRight() : turnLeft();
}

void loop() {
  // put your main code here, to run repeatedly:
}

Just know that every time you cast to a String (capital 'S') God kills an innocent Kitten. So best not do that!

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