arduino, eletrônica, robotica...

Problema com Sketch para monitorar vazão via lcd i2c

Quando eu uso esse sketch com serial.begin (9600) no void setup e serial.print(" L/hour\r\n"); e serial.print (Calc, DEC); no void loop consigo monitorar a vazão pelo serial monitor se apagar os codigos lcd.print no void loop.

O sketch abaixo eu consigo escrever a frase no LCD e depois eu limpo a tela e nada acontece.

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display

volatile int NbTopsFan; //measuring the rising edges of the signal
int Calc;
int hallsensor = 2; //The pin location of the sensor

void rpm ()

{
NbTopsFan++; //This function measures the rising and falling edge of the

}

void setup()

{
pinMode(hallsensor, INPUT); //initializes digital pin 2 as an input

lcd.init();
lcd.backlight();
lcd.setCursor( 4, 1);
lcd.print("Frase inferior");
lcd.setCursor( 1, 0);
lcd.print("Frase superior");
delay(5000);
lcd.clear();

attachInterrupt(0,rpm, RISING); //and the interrupt is attached
}

void loop ()

{
NbTopsFan = 0; //Set NbTops to 0 ready for calculations
sei(); //Enables interrupts
delay (1000); //Wait 1 second
cli(); //Disable interrupts
Calc = (NbTopsFan * 60 / 5.5); //(Pulse frequency x 60) / 5.5Q, = flow rate

lcd.init();
lcd.setCursor( 0, 0);
lcd.print(Calc, DEC);
lcd.setCursor( 0, 0);
lcd.print(" L/hour\r\n");
}