pH Meter to Arduino to LCD help please.

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Hello mike.

Thank you again :D. Yes, the problem is an oscilation, problably an AC 60 Hz noise comming from the power supllies, maybe. I did this for now, i took a number of measurrements, every 10 miliseconds, then i calculated the mean of these values, the result is the value that my multimeter is matching. Now i have the value in the Arduino :D.

Now i have one question about interrupts, can i do that in this post ?, if yes this is my dude:

I now how to use the attach interrupt function and some limitations that we have in the function called by the interrupt. My dude is ... i will post a little code:

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int pin = 13;
volatile int estado = LOW;
void setup()
{
  pinMode(pin, OUTPUT);
  pinMode(2,INPUT);
   lcd.begin(16, 2);
  digitalWrite(2,HIGH);//pullup
  attachInterrupt(0, myfunc, LOW);
  Serial.begin(9600); 
}

void loop()
{
  estado = LOW;
  digitalWrite(pin, estado);
  
  delay(100); 
}

void myfunc()
{
  estado = HIGH;
  digitalWrite(pin, estado);
lcd.setCursor(1,0);
  lcd.print("INTERR");
 digitalWrite(pin,estado);
}

I dont know how is the life cycle of the interrput... i mean, i am wondering if the function called by the interrupt acts as a loop function while the "interrupt pin" is low (for my example) or the things in the "interrupt function"(myfunc in my example) are done just one time and the processor "waits" for the "interrupt pin" go to HIGH.