random dots at screen

[piczyro]

So i try to run this code at esp8266 with ds3231 and i get the random dots at oled screen

`/*
https://somtips.com
https://youtube.com/somtips
*/
#include <Wire.h>
#include <DS3231.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#define OLED_ADDR 0x3C
DS3231 Clock;
bool Century=false,h12,pm;
char week[7][20] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
char mon[12][4] = {"JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"};
Adafruit_SSD1306 display(-1);

void setup() {
Serial.begin(9600);
Wire.begin();
delay(3000);
display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
display.clearDisplay();
display.display();

}

void loop() {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(30,0);
display.println("Som Tips");
display.print(week[Clock.getDoW()-1]);
display.print(" ");
display.print(mon[Clock.getMonth(Century)-1]);
display.print(" ");
display.print(Clock.getDate());
display.print(" 20");
display.println(Clock.getYear());
display.print(" ");
display.print(Clock.getHour(h12, pm));
display.print(" : ");
display.print(Clock.getMinute());
display.print(" : ");
display.print(Clock.getSecond());
display.println(" HRS");
display.print(" Temp: ");
display.print(Clock.getTemperature(), 1);
display.println(" C");
display.display();
delay(1000);

}

`

[Gregor Hartmann]

It's about Lua and nodemcu firmware here.
So you will have to seek help some other place.