Arduino matrix scrolling weather station and Clock with BME

#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Max72xxPanel.h>
#include <Adafruit_BME280.h>
#include "RTClib.h"

RTC_DS1307 rtc; 

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

Adafruit_BME280 bme280;
int mm; 

int pinCS = 10; // Uno or Duemilanove DIN 11 (MOSI) CLK 13 (SCK)
int numberOfHorizontalDisplays = 7;
int numberOfVerticalDisplays = 1; 

Max72xxPanel matrix = Max72xxPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);

String tape = "";
int wait = 25; // speed

int spacer = 2; // Character spacing (points)
int width = 5 + spacer; // Font width 5 pixels

String utf8rus(String source)
{
  int i,k;
  String target;
  unsigned char n;
  char m[2] = { '0', '\0' };

  k = source.length(); i = 0;
  while (i < k) {
    n = source[i]; i++;
    if (n >= 0xC0) {
      switch (n) {
        case 0xD0: {
          n = source[i]; i++;
          if (n == 0x81) { n = 0xA8; break; }
          if (n >= 0x90 && n <= 0xBF) n = n + 0x2F;
          break;
        }
        case 0xD1: {
          n = source[i]; i++;
          if (n == 0x91) { n = 0xB7; break; }
          if (n >= 0x80 && n <= 0x8F) n = n + 0x6F;
          break;
        }
      }
    }
    m[0] = n; target = target + String(m);
  }
return target;
}

String Serial_Read() {
  unsigned char c; // variable port for reading series
  String Serial_string = ""; // Forming from a character string
  while (Serial.available() > 0) { // If there are symbols in the series
    c = Serial.read(); // We read a symbol
    //Serial.print(c,HEX); Serial.print(" "); Serial.print(c);
    if (c == '\n') {  //If this is a string of lines
          return Serial_string; // We return the line
    }
    if (c == 0xB8) c = c - 0x01; 
    if (c >= 0xBF && c <= 0xFF) c = c - 0x01;
    Serial_string = Serial_string + String(char(c)); //Add symbol to line
  }
  return Serial_string; 
}
String chas;
String myn;
//String mesyc = "";

void setup() {
  
  Serial.begin(9600);
  Serial.println(F("bme280"));
  //==================================== hours
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }
  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    // When time needs to be set on a new device, or after a power loss, the
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
 //====================================
  while (!bme280.begin(BME280_ADDRESS - 1)) {
    Serial.println(F("Could not find a valid bme280 sensor, check wiring!"));
    delay(2000);
  }
  
 
  
  matrix.setIntensity(3); // Use a value between 0 and 15 for brightness
  matrix.setRotation(matrix.getRotation()+0); //1 - 90  2 - 180   3 - 270
 //a=a+1;
}
void loop() {
  DateTime now = rtc.now();
  float temperature = bme280.readTemperature();
  float pressure = bme280.readPressure()/100.0F;
  float altitude = bme280.readAltitude(1013.2);
  float humidity = bme280.readHumidity();
  pressure = pressure + 78.5  ;   //Relative pressure for 700m above sea level, comment this row for relative atmospheric pressure
 //======================================= correction digit time zero before the number
 chas ="";
 myn = "";
 if (now.hour() < 10) {
chas = '0';
}

if (now.minute() < 10) {
myn = ('0');
}

//=======================================
 tape = utf8rus((String)+daysOfTheWeek[now.dayOfTheWeek()]+"     Time  "+chas +now.hour()+":"+myn+now.minute()+" h    Temperature = "+temperature +" degree C   Humidity = " + humidity +  " %    Pressure = "+ pressure +" Hpa");
  if (Serial.available()){
    tape=Serial_Read();
  } 
  for ( int i = 0 ; i < width * tape.length() + matrix.width() - 1 - spacer; i++ ) 
       {
    matrix.fillScreen(LOW);

    int letter = i / width; // number of symbols displayed on a matrix
    
    int y = (matrix.width() - 1) - i % width;  
    int x = (matrix.height() - 8) / 2; 

    while ( y + width - spacer >= 0 && letter >= 0 ) {
      if ( letter < tape.length() ) {
        matrix.drawChar(y, x, tape[letter], HIGH, LOW,1);
      }
      letter--;
      y -= width;
    }
    matrix.write(); // Send a picture for display
    delay(wait);
  }
}