Color-changing Lamp Via Temperature Input

1const int greenLEDPin = 9;    // LED connected to digital pin 9
2const  int redLEDPin = 10;     // LED connected to digital pin 10
3const int blueLEDPin  = 11;    // LED connected to digital pin 11
4
5// room temperature in Celcius
6const  float baselineTemp = 20.0;
7
8const float baselineSens = 144;
9const int TempSensor  = A0;  // pin with the temp sensor
10
11int redValue = 0; // value to write to  the red LED
12int greenValue = 0; // value to write to the green LED
13int blueValue  = 0; // value to write to the blue LED
14
15void setup() {
16  // initialize  serial communications at 9600 bps:
17  Serial.begin(9600);
18
19  // set the  digital pins as outputs
20  pinMode(greenLEDPin, OUTPUT);
21  pinMode(redLEDPin,  OUTPUT);
22  pinMode(blueLEDPin, OUTPUT);
23}
24
25void loop() {
26
27  //  read the value on AnalogIn pin 0
28  // and store it in a variable
29  int sensorVal  = analogRead(TempSensor);
30  delay(5);
31  //Serial.println(sensorVal);
32   //  convert the ADC reading to voltage
33   // convert temp sensor reading from 0-1024  to analogWrite value from 0-255 
34  float voltage = (sensorVal / 1024.0) * 5.0;
35  
36  
37    // Send the voltage level out the Serial port
38  Serial.print("Volts:  ");
39  Serial.print(voltage);
40  
41  // convert the voltage to temperature  in degrees C
42  // the sensor changes 10 mV per degree
43  // the datasheet says  there's a 500 mV offset
44  // ((volatge - 500mV) times 100)
45  Serial.print(",  degrees C: ");
46  float temperature = (voltage - .5) * 100;
47  Serial.println(temperature);
48  if (temperature < baselineTemp) {
49  analogWrite(redLEDPin, 0);
50  analogWrite(greenLEDPin,  127);
51  analogWrite(blueLEDPin, 0);
52  }else if (temperature >= baselineTemp  && temperature < baselineTemp + 2) {
53  analogWrite(redLEDPin, 0);
54  analogWrite(greenLEDPin,  255);
55  analogWrite(blueLEDPin, 0);
56  } // if the temperature rises 2-4 degrees,  turn an LED on
57  else if (temperature >= baselineTemp + 2 && temperature < baselineTemp  + 4) {
58  analogWrite(redLEDPin, 0);
59  analogWrite(greenLEDPin, 0);
60  analogWrite(blueLEDPin,  255);
61  } // if the temperature rises 4-6 degrees, turn a second LED on
62  else  if (temperature >= baselineTemp + 4 && temperature < baselineTemp + 6) {
63  analogWrite(redLEDPin,  127);
64  analogWrite(greenLEDPin, 0);
65  analogWrite(blueLEDPin, 127);
66  }  // if the temperature rises more than 6 degrees, turn all LEDs on
67  else if (temperature  >= baselineTemp + 6) {
68  analogWrite(redLEDPin, 255);
69  analogWrite(greenLEDPin,  0);
70  analogWrite(blueLEDPin, 0);
71  }
72  delay(1);
73
74
75}
76
77