float sizeArray[20][3] = {

    {23.1, 3, 36},
    {23.3, 3.5, 36.5},
    {23.5, 4, 37},
    {24, 4.5, 37.5},
    {24.3, 5, 38},
    {24.8, 5.5, 38.5},
    {25.1, 6, 39},
    {25.4, 6.5, 40},
    {25.8, 7, 40.5},
    {26.3, 7.5, 41},
    {26.7, 8, 42},
    {27.1, 8.5, 42.5},
    {27.6, 9, 43},
    {28, 9.5, 43.5},
    {28.4, 10, 44},
    {28.9, 10.5, 45},
    {29.3, 11, 46},
    {29.7, 11.5, 46.5},
    {30.1, 12, 47},
    {30.5, 13, 48}

};


void loop(){
  float waarde = "waarde van sensor";

  Serial.println("begin met meten");
  for(int i = 0; i < 20; i++){     //first loop

    Serial.print(sizeArray[i][0]);

    if(waarde < sizeArray[i][0]){

          Serial.println("past wel, je maat is");
          Serial.println(sizeArray[i][2]);
          delay(2000);
          break;
     } else {
          Serial.println("past niet");
     }
  }
}