Lcd Not showing my program after uploading it too my Arduino uno board

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1

Please, when i uploaded my program too my Arduino board it worked but now i a re-uploading same code again after changing it the fiest time its not working?

2

Welcome. Think about how little we can know about your project. I guess you skipped over the instructions about how to provide information so people can help.

3

Am working on an industrial power supply by integral switching without generating harmonics..

4 
#include <Wire.h>

#include <LiquidCrystal_I2C.h>

int totalColumns = 16;
int totalRows = 2;

//I2C pin declearation 

LiquidCrystal_I2C lcd(0*27, totalColumns, totalRows);
int AC_LOAD=3; //Output to Opto Triac pin
int dimming=128; //Dimming level (0-128) 0=ON, 128=OFF
int push_one=4;
int push_two=5;
int push_three=6;
int push_four=7;
int count=5;

void setup()
 {
 pinMode(push_one,INPUT);
 pinMode(push_two,INPUT);
 pinMode(push_three,INPUT);
 pinMode(push_four,INPUT);
 lcd.init(); //initialize the lcd
 lcd.backlight(); //To Power ON the backlight
 //lcd.backlight(); //To Power OFF the backlight
 pinMode(AC_LOAD, OUTPUT);//Set AC Load pin as output
 attachInterrupt(0, zero_cross_int, RISING); //Choose the zero cross interrupt from the table above

}

//the interrupt function must take no parameters and return nothing
void zero_cross_int() //function to be fired at the zero crossing to dim the light

{
  //Firing angle calculation : 1 full 50Hz wave=1/50=20ms
  //Every zero crossing thus: (50Hz)-> 10ms (1/2 Cycle)
  //For 60Hz=> 8.33ms(10.000/120)
  //10ms=10000us
  //(10000us-10us) /128-75 (Approx) For 60Hz=>65

 int dimtime=(75*dimming); //For 60Hz=>65
 delayMicroseconds(dimtime);//Wait till firing the TRIAC
 digitalWrite(AC_LOAD, HIGH); //Fire the TRIAC
 delayMicroseconds(10); //Triac On propogation delay(for 60Hz use 8.33)
 digitalWrite(AC_LOAD, LOW); //No longer trigger the Triac(the next zero crossing will switch it off)TRIAC
  
}
void loop() {
 if(digitalRead(push_three)==0)
{
 lcd.setCursor(0,0); //Defining position to write from first row, first column .
 lcd.print("DIMMING SET");
 lcd.setCursor(0,2); //Defining position to write from first row, first column .
 lcd.print("HIGH TO LOW");
 for(int i=5;i<=128;i++){
 dimming=i;
 delay(10);
 }
}
 if(digitalRead(push_four)==0)
{
 lcd.setCursor(0,0); //Defining position to write first row, first column .
 lcd.print("VERY LOW PULSES");
 dimming=120;
 delay(10);
}
 else
{
 if(digitalRead(push_one)==0)
{
 count=count+5;
 lcd.setCursor(0,0); //Defining position to write from first row,frist column .
 lcd.print("PULSE LEVEL:");
 lcd.print(count);
 dimming=count;
 delay(100);
 lcd.clear();
}
 if(digitalRead(push_one)==1)
{
 lcd.setCursor(0,0); //Defining position to write from first row, first column .
 lcd.print("PULSE LEVEL:");
 lcd.print(count);
 dimming=count;
 delay(50);
 lcd.clear();
}
 if(digitalRead(push_two)==0)
{
 count=count-5;
 lcd.setCursor(0,0); //Defining position to write from first row,first column .
 lcd.print("PULSE LEVEL:");
 lcd.print(count);
 dimming=count;
 delay(100);
 lcd.clear();
}
 else
{
 lcd.setCursor(0,0); //Definig position to write from first row, first column .
 lcd.print("PULSE LEVEL:");
 lcd.print(count);
 dimming=count;
 delay(50);
 lcd.clear();
    }
    }
  }
[quote="Jc-Nak, post:1, topic:1015952, full:true"]
Please, when i uploaded my program too my Arduino board it worked but now i a re-uploading same code again after changing it the fiest time its not working?
[/quote]

This is my program code above...
5

I think that should be
LiquidCrystal_I2C lcd(0x27, totalColumns, totalRows);
(0x27, not 0*27)

6

Thank you so much​:+1::+1::+1:.....