Temp Sensor 3

Temp Sensor 3

//Take analogue readings from four temperature sensors (LM35). When temperature increases sufficiently (hand touches
//sensor), light up one LED. Each sensor has it's own LED.

//cycle count
int cycle = 0;

//variables for storing the reading, then converting reading to celsius
int reading0;
int reading1;
int reading2;
int reading3;

float tempC0;
float tempC1;
float tempC2;
float tempC3;

//variables for the delta_tempData values
float old_tempC0;
float old_tempC1;
float old_tempC2;
float old_tempC3;
//compares the difference between current tempData and old_tempData
float delta_tempC0;
float delta_tempC1;
float delta_tempC2;
float delta_tempC3;
//store the previous delta value for use in average
float old_delta0;
float old_delta1;
float old_delta2;
float old_delta3;
//averages the last 2 delta values
float av_delta0;
float av_delta1;
float av_delta2;
float av_delta3;
//sum of last 2 delta values
float sum_delta0;
float sum_delta1;
float sum_delta2;
float sum_delta3;

//i counts the cycles until the 4th cycle. Then resests and returns av_delta(values) in the Serial port
int i = 0;

//i0 is the value of brightness of LED0, and so on with i1, i2, i3
int i0 = 0;
int i1 = 0;
int i2 = 0;
int i3 = 0;

//initialize the tempSensor Pins
int tempPin0 = 0;
int tempPin1 = 1;
int tempPin2 = 2;
int tempPin3 = 3;

//assign the LED pins
int LED0 = 13;
int LED1 = 12;
int LED2 = 8;
int LED3 = 7;

void setup()
{
  analogReference(INTERNAL);
  Serial.begin(9600);

  //initialize LED pins
  pinMode(LED0, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
}

void loop()
{
  cycle ++;

  //store tempData as old data for delta values
  old_tempC0 = tempC0;
  old_tempC1 = tempC1;
  old_tempC2 = tempC2;
  old_tempC3 = tempC3;

  //store old delta values for delta average
  old_delta0 = delta_tempC0;
  old_delta0 = delta_tempC1;
  old_delta0 = delta_tempC2;
  old_delta0 = delta_tempC3;

  //read data for pin0
  reading0 = analogRead(tempPin0);
  tempC0 = reading0 / 9.31; //convert reading to celsius by x/9.31

  //read data for pin1
  reading1 = analogRead(tempPin1);
  tempC1 = reading1 / 9.31;

  //read data for pin2
  reading2 = analogRead(tempPin2);
  tempC2 = reading2 / 9.31;

  //read data for pin3
  reading3 = analogRead(tempPin3);
  tempC3 = reading3 / 9.31;
  if (cycle > 4) {
    //delta values of tempData and old_tempData
    delta_tempC0 = tempC0 - old_tempC0;
    delta_tempC1 = tempC1 - old_tempC1;
    delta_tempC2 = tempC2 - old_tempC2;
    delta_tempC3 = tempC3 - old_tempC3;

    //if temperature is rising, fade on assigned LED. Else if temperature is dropping, fade off LED

    if ((delta_tempC0) >= 0.18) {
      i0 += 10;
      digitalWrite(LED0, HIGH);
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);

    } else if (-0.12 >= (delta_tempC0))  { //
      i0 -= 10;
      digitalWrite(LED0, LOW);
    }

    if ((delta_tempC1) >= 0.18) {
      i1 += 10;
      digitalWrite(LED0, LOW);
      digitalWrite(LED1, HIGH);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);

    } else if (-0.12 >= (delta_tempC1))  { //
      i1 -= 10;
      digitalWrite(LED1, LOW);
    }
    if ((delta_tempC2) >= 0.18) {
      i2 += 10;
      digitalWrite(LED0, LOW);
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, HIGH);
      digitalWrite(LED3, LOW);

    } else if (-0.12 >= (delta_tempC1))  { //
      i2 -= 10;
      digitalWrite(LED2, LOW);
    }
    if ((delta_tempC3) >= 0.18) {
      i3 += 10;
      digitalWrite(LED0, LOW);
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, HIGH);

    } else if (-0.12 >= (delta_tempC3))  { //
      i3 -= 10;
      digitalWrite(LED3, LOW);
    }

    i = i + 1;
    if (i / 4 == 1) {
      i = 0;
      sum_delta0 = delta_tempC0 + old_delta0;


      /*
        //only print av_delta every four cycles
        //print all delta averages
        Serial.println("averages");
        Serial.println(av_delta0);
        Serial.println(av_delta1);
        Serial.println(av_delta2);
        Serial.println(av_delta3);
        Serial.println("");*/

    }
  }



  //average the current delta and the previous delta
  av_delta0 = (delta_tempC0 + old_delta0) / 2;
  av_delta1 = (delta_tempC1 + old_delta1) / 2;
  av_delta2 = (delta_tempC2 + old_delta2) / 2;
  av_delta3 = (delta_tempC3 + old_delta3) / 2;

  //print all results
  Serial.println("results");
  Serial.println(tempC0);
  Serial.println(tempC1);
  Serial.println(tempC2);
  Serial.println(tempC3);
  Serial.println(""); //empty line to neatin the print
  //print all changes (delta values)
  Serial.println("changes");
  Serial.println(delta_tempC0);
  Serial.println(delta_tempC1);
  Serial.println(delta_tempC2);
  Serial.println(delta_tempC3);
  Serial.println("");



  //delay to make serial communication easier to read
  delay(1000);
}