Algorithms for reading and interpolating measurements from specified table lookups.

lookup.cpp

// Ref: https://forum.arduino.cc/t/how-to-create-lookup-table/116161/19
// Title: How to create lookup table

int[] tableLookup = {
  140, 300,
  151, 280,
  162, 260, 
  184, 240, 
  211, 220, 
  250, 200, 
  285, 180, 
  328, 160, 
  371, 140, 
  0, 0
};

float getValue(int[] lookup, int currentValue) {
  float value = 0;
  for (int i=0; i<lookup.length-2; i=i+2) {
    if ((currentValue >= lookup[i]) && (currentValue <= lookup[i+2])) {
      value = lookup[i+1] - ((lookup[i+1]-lookup[i+3]) * ((currentValue-lookup[i]) / (lookup[i+2]-lookup[i])));
      break;
    }
  }
  return value;
}

getValue(lookup, 162);

// 243.63636363636363