Week 11, 11/13: Light IO

Code Version 1

int LEDpin = 9;

int PRpin = A0;

int PRval, LEDval;

void setup(){

  pinMode(LEDpin, OUTPUT);

  pinMode(PRpin, INPUT);

  Serial.begin(9600);

}

void loop(){

  readPR();

  writeLED();

}

void readPR(){

  PRval = analogRead(PRpin);

  Serial.print("PRval = ");

  Serial.print(PRval);

}

void writeLED(){

  LEDval = map(PRval, 0, 450, 0, 255);

  analogWrite(LEDpin, LEDval);

  Serial.print(", LEDval = ");

  Serial.println(LEDval); 

}

Code Version 2

int LEDpin = 9;
int PRpin = A0;
int PRval, LEDval, num;

void setup(){
  pinMode(LEDpin, OUTPUT);
  pinMode(PRpin, INPUT);
  Serial.begin(9600);
}

void loop(){
  readPR();
  Serial.print("PRval = ");
  Serial.print(PRval);
  if(PRval < 10) num = 1;
  else if(PRval > 300) num = 3;
  else num = 2;
  switch(num){
    case 1: // PR is in shadow
      Serial.println("shadow");
      digitalWrite(LEDpin, LOW);
      break;
    case 2: // PR is in ambient light
      Serial.println("ambient");
      writeLED();
      break;
    case 3: // PR is in bright light
      Serial.println("bright");
      digitalWrite(LEDpin, LOW);
      break;
  }
  delay(20);
}

void readPR(){
  PRval = analogRead(PRpin);
}

void writeLED(){
  LEDval = map(PRval, 0, 450, 255, 0);
  analogWrite(LEDpin, LEDval);
}