gistfile1.cpp

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

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

void setup() {
        lcd.begin(16,2);
}

void loop() {
        int n = random(1,16);
        lcd.clear();
        while (n-- >= 0)
                lcd.write('#');
        delay(100);
}