LCD 16*2 doesn't work when code joined with ACS712 sensor

hello!
i'm working project telemetry street lamp. using acs712 current sensor(ac current) , rectifier voltage sensor (and lcd i2c interface), when test each code, work when joined current sensor code , lcd code. lcd not show character.

acs712 code

code: [select]


#include <filters.h>

float testfrequency = 60;                     // test signal frequency (hz)
float windowlength = 20.0/testfrequency;     // how long average signal, statistist
int sensorvalue = 0;
float intercept = -0.1129; // adjusted based on calibration testing
float slope = 0.0405; // adjusted based on calibration testing
float current_amps; // estimated actual current in amps

unsigned long printperiod = 1000; // in milliseconds
// track time in milliseconds since last reading
unsigned long previousmillis = 0;

void setup() {
  serial.begin( 57600 );    // start serial port
}

void loop() {
  runningstatistics inputstats;                 // create statistics @ raw test signal
  inputstats.setwindowsecs( windowlength );
  
  while( true ) {  
    sensorvalue = analogread(a0);  // read analog in value:
    inputstats.input(sensorvalue);  // log stats function
        
    if((unsigned long)(millis() - previousmillis) >= printperiod) {
      previousmillis = millis();   // update time
      
      // display current values screen
      serial.print( "\n" );
      // output sigma or variation values associated inputvalue itsel
      serial.print( "\tsigma: " ); serial.print( inputstats.sigma() );
      // convert signal sigma value current in amps
      current_amps = intercept + slope * inputstats.sigma();
      serial.print( "\tamps: " ); serial.print( current_amps );
    }
  }
}





lcd code

code: [select]


/* http://www.electronoobs.com */

/*-----( inport library )-----*/
#include <wire.h>
#include <liquidcrystal_i2c.h>
//i2c pins
liquidcrystal_i2c lcd(0x3f, 2, 1, 0, 4, 5, 6, 7, 3, positive); //
int volt=0;
int amp=0;

void setup()
{
serial.begin(9600);
//we define our lcd 16 columns , 2 rows
lcd.begin(16,2);
lcd.backlight();//power on light
//lcd.backlight(); power off light

}

void loop()
{

//write text:
lcd.setcursor(0,0); //we start writing first row first column
lcd.print("tegangan: "); //16 characters poer line
lcd.setcursor(0,1);
lcd.print("arus: ");
delay(1000);


}


final code

code: [select]


#include <filters.h>
#include <wire.h>
#include <liquidcrystal_i2c.h>

//i2c pins
liquidcrystal_i2c lcd(0x3f, 2, 1, 0, 4, 5, 6, 7, 3, positive); //
int volt = 0;
int amp = 0;

float testfrequency = 60;                     // test signal frequency (hz)
float windowlength = 20.0 / testfrequency;   // how long average signal, statistist
int sensorvalue = 0;
float intercept = -0.1129; // adjusted based on calibration testing
float slope = 0.0405; // adjusted based on calibration testing
float current_amps; // estimated actual current in amps

unsigned long printperiod = 1000; // in milliseconds
// track time in milliseconds since last reading
unsigned long previousmillis = 0;

void setup() {
  serial.begin( 9600 );    // start serial port
  lcd.begin(16, 2);
  lcd.backlight();
}

void loop() {



  runningstatistics inputstats;                 // create statistics @ raw test signal
  inputstats.setwindowsecs( windowlength );

  while ( true ) {
    sensorvalue = analogread(a0);  // read analog in value:
    inputstats.input(sensorvalue);  // log stats function

    if ((unsigned long)(millis() - previousmillis) >= printperiod) {
      previousmillis = millis();   // update time

      // display current values screen
      serial.print( "\n" );
      // output sigma or variation values associated inputvalue itsel
      serial.print( "\tsigma: " ); serial.print( inputstats.sigma() );
      // convert signal sigma value current in amps
      current_amps = intercept + slope * inputstats.sigma();
      serial.print( "\tamps: " ); serial.print( current_amps );
    }
  }
  lcd.setcursor(0, 0); //we start writing first row first column
  lcd.print("tegangan: "); //16 characters poer line
  lcd.setcursor(0, 1);
  lcd.print("arus: "); lcd.print(current_amps, 5);
}




every advice may helps problem here
thanks

the problem in main loop have while( true ) construct lcd code never executed. try commenting out while ( true ) { statement , corresponding closing '}' , see if further.

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