LCDFUNandBacksaikr2992.ino

/*
Buy LCD Shield for 350 re and arduino uno for 500 re online/offline and plug in. Burn this code and then connect to cheap charger/pc and enjoy
Code by Dr. Harish with LCD shield on arduino for math and recreation which can be used in calculators on brick games while reprogrammability of shop product compared to arduino product and DC power electronics are lesser in that. Can add forex also! LEDS can also be made to randomly blink like Induinosup4 but needs soldering
*/

/*

In scientific calculators a code for integrends of changing functions in an interval or changing differentials at a point value would be nice. Quadratics, Linear equations in 2-3 variables etc. std dev
*/
#include <EEPROM.h>
// include the library code:
#include <LiquidCrystal.h>
#include <math.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 8, en = 9, d4 = 4, d5 = 5, d6 = 6, d7 = 7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
char text[]="Jai sairam, Hare Krishna, Om shivaya";
char texttemp[50];
char text2[]="Success 90%perspiration &10%inspiration";
void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2); 
  
  

}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 0);
  int a;
   a=int(random(5));
  if(a==0){
  lcd.print("Dr. Harish  Fun   ");}
  if(a==1){
    lcd.print("God is great    ");
  }

   if(a==2){
    lcd.print("Om Sri Sairam   ");
  }

     if(a==3){
    lcd.print("Sai Krushna CT  ");
  }

  if(a==4){

    int year=random(3500)-1000;
    if(year<0){
      year=year*-10;
      lcd.print(year);
      lcd.print(" BC     ");
    }

    else{
      
      lcd.print(round(year*1.2));
      lcd.print(" AD      ");
    }
  
  }
  lcd.setCursor(0, 1);
  
  
  int b;
  int c;
  int d;
  float e;
  float f;
  float g;
  int h;
   a=random(8);
  if(a==0){//select sum
  b=int(random(620));
  c=int(random(120));
  d=b+c;
 
      lcd.print(b);
    lcd.print(" + ");
    lcd.print(c);
    
      lcd.print(" = ");

      delay(5000+random(2500));
      lcd.print(d);
      lcd.print("    ");
    }
  if(a==1){//select product
  b=int(random(40));
  c=int(random(40));
  d=b*c;
 
      lcd.print(b);
    lcd.print(" * ");
    lcd.print(c);
    
      lcd.print(" = ");
      delay(5000+random(2500));
      lcd.print(d);
      lcd.print("        ");
    }

  if(a==2){//select product
  b=int(random(620));
  c=int(random(140));
  d=b-c;
 
      lcd.print(b);
    lcd.print(" - ");
    lcd.print(c);
    
      lcd.print(" = ");
      delay(5000+random(2500));
      lcd.print(d);
    
      lcd.print("    ");
    }

  if(a==3){//select sum
  f=float(random(10)+1);
  g=float(random(5));
  e=pow(f,g);
 
      lcd.print(round(f));
    lcd.print(" ^ ");
    lcd.print(round(g));
    
      lcd.print(" = ");
      delay(5000+random(2500));
      lcd.print(round(e));
      lcd.print("      ");
    }

  if(a==4){//select sum
  f=float(random(100)+1.0);
  g=float(random(20)+1.0);
  e=round(f/g*100.0)/100.0;
 
      lcd.print(int(f));
    lcd.print(" / ");
    lcd.print(int(g));
    
      lcd.print(" = ");
      delay(5000+random(2500));
      lcd.print(e);
      lcd.print("    ");
    }

  if(a==5){//select product
  b=int(random(40));
  c=int(random(40));
  h=int(random(20));
  d=b+c-h;
 
      lcd.print(b);
    lcd.print("+");
    lcd.print(c);
      lcd.print("-");
    lcd.print(h);
    
      lcd.print("=");
      delay(5000+random(2500));
      lcd.print(d);
      lcd.print("      ");
    }
  if(a==6){//select product
  b=int(random(40));
  c=int(random(40));
  h=int(random(20));
  d=b*c+h;
 
      lcd.print(b);
    lcd.print("*");
    lcd.print(c);
      lcd.print("+");
    lcd.print(h);
    
      lcd.print("=");
      delay(5000+random(2500));
      lcd.print(d);
      lcd.print("      ");
    }
  if(a==7){//select product
    int subind=random(7);
    if(subind==0)
      lcd.print("Loveall serveall      ");
    if(subind==1)
      lcd.print("Help ever       ");
    if(subind==2)
      lcd.print("Hurt never      ");
    if(subind==3)
      lcd.print("Excercise daily      ");
    
    if(subind==4)
      lcd.print("F=ma, v=u+at      ");
    if(subind==5)
      lcd.print("2H2 + O2 -> 2H2O      ");
    if(subind==6){
      unsigned int i=0;
      int subsubsubind=random(2);
      if(subsubsubind==0){
        while(text[i]!='\0'){
   lcd.print(text[i]);
   
 	if(i>=14)
	{
          lcd.scrollDisplayLeft(); //Scrolling text to Right
        }
   delay(250);
   i++;
   }
      }
      if(subsubsubind==1){
        while(text2[i]!='\0'){
   lcd.print(text2[i]);
   
 	if(i>=14)
	{
          lcd.scrollDisplayLeft(); //Scrolling text to Right
        }
   delay(250);
   i++;
   }
      }

    }
  }
    
  delay(3600+random(4000));
  lcd.clear();
}