Heather Simmons Project 1 Code

//source for twinkle twinkle code is Arduino cookbook, exercise 9.2
//source for fade code is Instructables website, user maewert http://www.instructables.com/id/RGB-LED-transition-Arduino/

int red = 9; //this sets the red led pin
int green = 10; //this sets the green led pin
int blue = 11; //this sets the blue led pin

int currentRed;//starting color level (0-255) for red color, whole number, so int
int currentBlue;//starting color level (0-255) for blue color
int currentGreen;//starting color level (0-255) for green color
int newRed;//new color level for red, this is the color the currentRed variable fades or brightens to
int newBlue;//same as immediately above, except for blue;
int newGreen;//same as immediately above, except for green;
int lightLevel;//holds reading of light levels from light dependent resistor ("LDR"), whole number from 0 to 1024, so int

float forceSensor;//holds reading of pressure exerted on force sensor; may have a decimal, so float. 
const int speakerPin = 6; // connect speaker to pin 6

char noteNames[] = {'C','D','E','F','G','a','b'};//array or "group" of note names in twinkle twinkle
unsigned int frequencies[] = {262,294,330,349,392,440,494};//array of frequencies associated with each note, "unsigned" means positive values only
const int noteCount = sizeof(noteNames); // sizeof operator returns number of notes (7 here) in array "noteNames"

//notes, a space represents a rest
char score[] = "CCGGaaGFFEEDDC GGFFEEDGGFFEED CCGGaaGFFEEDDC "; //musical score for twinkle twinkle, "char" because it is letters, not numbers 
const int scoreLen = sizeof(score); // sizeof operator returns the number of notes in the array "score


void setup()//one time set-up
{ //this sets the input and output pins
   pinMode(red, OUTPUT);//sets red pin as an output
   pinMode(green, OUTPUT);//sets green pin as an output
   pinMode(blue, OUTPUT);//sets blue pin as an output
   pinMode(lightLevel, INPUT);//sets LDR as an input
   pinMode(forceSensor, INPUT);//sets force sensor as an input 
 
   currentRed = random(255);//sets red color saturation to a random number between 0 and 255
   currentBlue = random(255);//sets blue color saturation to a random number between 0 and 255
   currentGreen = random(255);//sets green color saturation to a random number between 0 and 255
   newRed = currentRed;//sets new red value to current red in order to get started
   newBlue = currentBlue;//same as above, for blue
   newGreen = currentGreen;//same as above, for green
 
   Serial.begin(9600);//initialize serial monitor, for debugging
   randomSeed(analogRead(0));//initialize pseudo-random number generator by reading LDR value (range of possible numbers between 0 and 1024, so analog)
}

void playNote(char note, int duration)//function, requires two parameters, note and duration
{
  // play the tone corresponding to the note name
  for (int i = 0; i < noteCount; i++)
  {
    // try and find a match for the noteName to get the index to the note
    if (noteNames[i] == note) // find a matching note name in the array
      tone(speakerPin, frequencies[i], duration); //  play the note
  }
  // if there is no match then the note is a rest, so just do the delay
  delay(duration);
}

#define fade(x,y) if (x>y) x--; else if (x<y) x++;//function which takes two parameters, x and y (current color and new color), and either fades or brightens current color to new color

void loop()//continuous loop
{
  forceSensor = analogRead(A2);//read pressure on force sensor, range of values, so analog
  lightLevel=(analogRead(0));//read light level at LDR, range of values, so analog
  
  //use serial monitor to read LDR and force sensor levels, and output RGB values - for debugging purposes
  Serial.print("LDR reading = ");
  Serial.println(lightLevel);
  Serial.print("RGB values are ");
  Serial.print(currentRed);
  Serial.print(",");
  Serial.print(currentGreen);
  Serial.print(",");
  Serial.println(currentBlue);
  Serial.print("Force sensor reading = ");
  Serial.println(forceSensor);
  delay(1000);
  
  if (lightLevel<500)//if the room is dark, turn on the nightlight
  {
     if(forceSensor>20)//if it is dark in the room AND the cat's nose HAS been pressed (i.e., this "if" is nested in the LDR "if") ...
        {
          for (int i = 0; i < scoreLen; i++)//loop through as many times as there are notes in the score - i.e., scorelen
          {
            int duration = 333;  // each note lasts for a third of a second
            playNote(score[i], duration); // play the note
          }//end of for statement
       }//end of nested if statement  
    
   analogWrite(blue, currentBlue);//set the blue output pin to the analog value randomly generated for it in setup (generated by Arduino's random function)
   analogWrite(red, currentRed);//same as above, but for red
   analogWrite(green, currentGreen);//same as above, but for green;
 
   newRed = random(255);//pick a new random value between 0 and 255 for the red pin
   newBlue = random(255);//same as above, for the blue pin
   newGreen = random(255);//same as above, for the green pin

// fade or brighten to new colors
 
   while ((currentRed != newRed) ||//as long as current red does not equal new red, or current blue does not equal new blue, or current green does not equal new green...
    (currentBlue != newBlue) ||
    (currentGreen != newGreen))
     {
      fade(currentRed,newRed);//fade or brighten current red color to new red color
      fade(currentBlue,newBlue);//same as above, but for blue
      fade(currentGreen,newGreen);//same as above, but for green
  
      analogWrite(red, currentRed);//make the new red color the "current" red color so we can loop through the program again and fade or brighten to a new random color
      analogWrite(blue, currentBlue);//same as above, but for blue
      analogWrite(green, currentGreen);//same as above, but for green
      delay(20);//appropriate delay to produce "slow fade" effect
     }//end of while statement
 
  }//end of if statement
 
 else//If the room light is bright, turn the nightlight off.  The cat's nose also will not play the tune while the room light is bright. 
   {
     analogWrite(red, 0);
     analogWrite(green, 0);
     analogWrite(blue, 0);
   }//end of else statement
}//end of void loop