int red = 10;
int yellow = 9;
int green = 8;
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
  lcd.begin(16, 2);
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() {
  changeLights();
  delay(1500);
}

void changeLights() {
  lcd.clear();
  lcd.print("red");
  digitalWrite(yellow, LOW );
  digitalWrite(red, HIGH);
  digitalWrite(green, LOW );
  delay(3000);
  lcd.clear();
  lcd.print("yellow");
  digitalWrite(yellow, HIGH );
  digitalWrite(red, LOW );
  digitalWrite(green, LOW );
  delay(3000);
  lcd.clear();
  lcd.print("green");
  digitalWrite(yellow, LOW );
  digitalWrite(red, LOW );
  digitalWrite(green, HIGH );
  delay(3000);
  //if(
}