#include<Arduino.h>

void buttonISR()
{
  digitalWrite(PB5, HIGH); 
  digitalWrite(PB4, HIGH);
   digitalWrite(PA15, HIGH);
}

void serialEvent()
{
  Serial.println("Event Captured");
  if (Serial.available() > 0 )
  {
    switch (Serial.read())
    {
      case 'r': digitalWrite(PB5, HIGH);
        digitalWrite(PB4, LOW);
        digitalWrite(PA15, LOW);
        delay(2000);
        break;
      case 'g': digitalWrite(PB4, HIGH);
        digitalWrite(PB5, LOW);
        digitalWrite(PA15, LOW);
        delay(2000);
        break;
      case 'b': digitalWrite(PA15, HIGH);
        digitalWrite(PB5, LOW);
        digitalWrite(PB4, LOW);
        delay(2000);
        break;
    }
  }
}
void setup()
{
  pinMode(PA15, OUTPUT);
  pinMode(PB5, OUTPUT);
  pinMode(PB4, OUTPUT);
  pinMode(PA5, INPUT);
  attachInterrupt(digitalPinToInterrupt(PA5), buttonISR, RISING);
  Serial.begin(9600);
  Serial.print("Select your color");
}
void loop()
{
  digitalWrite(PB5, HIGH); digitalWrite(PB4, LOW); digitalWrite(PA15, LOW);
  delay(1000);
  digitalWrite(PB5, LOW); digitalWrite(PB4, HIGH); digitalWrite(PA15, LOW);
  delay(1000);
  digitalWrite(PB5, LOW); digitalWrite(PB4, LOW); digitalWrite(PA15, HIGH);
  delay(1000);

}