Reaction Time Game

/************************************
 *        Reaction Time Game        *
 *                                  *
 *      learnelectronics 3/3/23     *
 *       [email protected]      *
 * www.youtube.com/learnelectronics *
 *                                  *
 ***********************************/

#include <LCD_I2C.h>                                            //I2C LCD Driver
LCD_I2C lcd(0x27, 16, 2);                                       //setup lcd at hex addy 0x27, 16 columns, 2 rows

#define tacswitch 2                                             //tacswitch =2
#define redled 8                                                //redled =8
#define yelled 9                                                //yelled =9
#define greled 10                                               //greled =10

  long starttime = millis();                                    //start counter
  float redrand = random(100, 2000);                            // red led on for random time up to 2 seconds
  float yelrand = random(100, 3000);                            // yel led on for random time up to 3 sec










void setup() {

  Serial.begin(115200);

  pinMode(redled, OUTPUT);
  pinMode(yelled, OUTPUT);
  pinMode(greled, OUTPUT);
  pinMode(tacswitch, INPUT_PULLUP);
  digitalWrite(redled, LOW);
  digitalWrite(yelled, LOW);
  digitalWrite(greled, LOW);

  lcd.begin();
  lcd.backlight();
  lcd.print("Reaction Time");
  lcd.setCursor(0,1);
  lcd.print("   Game by LE");
  delay(1000);
  lcd.clear();
  //lcd.noBacklight();




  digitalWrite(redled,HIGH);
  delay(redrand);
  digitalWrite(redled,LOW);

  digitalWrite(yelled,HIGH);
  delay(yelrand);
  digitalWrite(yelled,LOW);


}


void loop() {


  delay(100);

  digitalWrite(greled, HIGH);

  if (digitalRead(2) == 0){

  long stoptime = millis();
  long mytime = (stoptime - starttime-1100-redrand-yelrand);
  lcd.setCursor(0,0);
  lcd.print("Your time is:");
  lcd.setCursor(0,1);
  lcd.print(mytime);
  lcd.print(" mSec:");


Serial.print("start - ");
Serial.println(starttime);
Serial.print("stop - ");
Serial.println(stoptime);
Serial.print("mytime - ");
Serial.print(mytime);
  }








}