// declare a global constant

// give the LED pin numbers a name
int ledBluePin = 9;
int ledGreenPin = 10;

int ptPresPin = A0;
int ptPhotPin = A1;

int ptPresVal;
int ptPhotVal;

int brtPresVal;
int brtPhotVal;

void setup() {

  pinMode(ledBluePin, OUTPUT);
  pinMode(ledGreenPin, OUTPUT);

  Serial.begin(9600);

}