Code:

// These constants won't change.  They're used to give names// to the pins used:const int oilIn = A0;    // Analog input pin that the potentiometer is attached toconst int oilOut = 11;   // Analog output pin that the transistor is attached toconst int waterIn = A1;  // Analog input pin that the potentiometer is attached toconst int waterOut = 10; // Analog output pin that the transistor is attached to/*const float xOffsetOil = 20;const float xStepOil =  50;const float yValueOil [] = {  20.0,  40.0,  60.0,  80.0, 100.0, 120.0, 140.0, 160.0, 180.0, 200.0, 220.0};   const float yPressOil [] = {  96.1,  82.9,  69.6,  56.4,  44.2,  32.6,  22.8,  15.4,   9.3,   3.7,  -1.1};*/const float xOffsetOil = 100;const float xStepOil =  50;const float yValueOil [] = {  125, 128, 131, 135, 139, 144, 150, 157, 170, 189, 203, 238 };const float yPressOil [] = {    0,   3,   7,  11,  16,  22,  29,  37,  47,  59,  74,  92 };const float xOffsetWater = 60;const float xStepWater =  30;const float yValueWater [] = { -60,  10,  60,  92, 133, 146, 157, 165, 171, 176, 180, 183, 186, 189, 192, 195, 198, 201, 205, 209, 214, 219, 224, 230, 236, 243, 250, 255, 255, 255, 255, 255, 255 };const float yTempWater []  = { 310, 285, 264, 249, 237, 226, 216, 207, 199, 192, 186, 180, 175, 170, 165, 160, 155, 150, 145, 140, 135, 130, 124, 118, 112, 106,  98,  89,  78,  67,  55,  43,  31 };void setup() {  pinMode (oilIn, INPUT);  pinMode (waterIn, INPUT);  pinMode (oilOut, OUTPUT);  pinMode (waterOut, OUTPUT);    // initialize serial communications at 9600 bps:  Serial.begin(9600);   Serial.println ("Ready");}int lookup (float val, float lowX, float highX, float lowY, float highY) {  float retFloat = (highY - lowY)/(highX-lowX) * val + lowY + 0.5;  int retInt = retFloat;  return retInt;}void loop() {  // read the analog in value:  int sensorRawWater = 0 ;  int sensorRawOil = 0 ;  for ( int i=0; i<10; i++) {     sensorRawWater = sensorRawWater + analogRead(waterIn);     sensorRawOil = sensorRawOil + analogRead(oilIn);  /*   Serial.println(sensorRawWater);        Serial.println(sensorRawOil);    delay (500);*/  }  float  sensorRawWaterAvg = sensorRawWater / 10;  float  sensorRawOilAvg = sensorRawOil / 10;    float sensorValueWater = sensorRawWaterAvg-xOffsetWater;  int xIntWater = sensorValueWater / xStepWater;  int outputValueWater = lookup(sensorValueWater - (xIntWater * xStepWater) , 0, xStepWater, yValueWater [xIntWater], yValueWater [xIntWater+1]);    int outputTempWater  = lookup(sensorValueWater - (xIntWater * xStepWater) , 0, xStepWater, yTempWater  [xIntWater], yTempWater  [xIntWater+1]);      float sensorValueOil = sensorRawOilAvg-xOffsetOil;  int xIntOil = sensorValueOil / xStepOil;  int outputValueOil = lookup(sensorValueOil - (xIntOil * xStepOil) , 0, xStepOil, yValueOil [xIntOil], yValueOil [xIntOil+1]);    int outputPressOil = lookup(sensorValueOil - (xIntOil * xStepOil) , 0, xStepOil, yPressOil [xIntOil], yPressOil [xIntOil+1]);       if (outputValueWater <0) {    outputValueWater = 0;  }  if (outputValueWater > 255) {    outputValueWater = 255;  }  analogWrite(waterOut, outputValueWater);             if (outputValueOil <0) {    outputValueOil = 0;  }  if (outputValueOil > 255) {    outputValueOil = 255;  }  analogWrite(oilOut, outputValueOil);        // print the results to the serial monitor:  Serial.print("Water sensor raw = " );                         Serial.print(sensorRawWaterAvg);        //  Serial.print("\t sensor-offset = " );                       //  Serial.print(sensorValueWater);        Serial.print("\t xInt = ");    Serial.print(xIntWater);        Serial.print("\t output = ");          Serial.print(outputValueWater);     Serial.print("\t yTempWater  [xIntWater+1] = ");          Serial.print(yTempWater  [xIntWater+1]);       Serial.print("\t yTempWater  [xIntWater] = ");          Serial.print(yTempWater  [xIntWater]);      Serial.print("\t Temp = ");        Serial.println(outputTempWater);       // print the results to the serial monitor:  Serial.print("Oil sensor raw = " );                         Serial.print(sensorRawOilAvg);      //  Serial.print("\t sensor-offset = " );                       //  Serial.print(sensorValueOil);        Serial.print("\t output = ");        Serial.print(outputValueOil);     Serial.print("\t Press = ");        Serial.println(outputPressOil);     // wait 2 milliseconds before the next loop  // for the analog-to-digital converter to settle  // after the last reading:  delay(500);                     }