Часы на светодиодных семисегментных индикаторах 1,8 дюйма (Arduino)

#include <MsTimer2.h>  // http://rcl-radio.ru/wp-content/uploads/2018/11/MsTimer2.zip
#include <Wire.h> 
#include <Adafruit_Sensor.h>  // http://rcl-radio.ru/wp-content/uploads/2018/08/Adafruit_Sensor.zip
#include <Adafruit_BMP280.h> // http://rcl-radio.ru/wp-content/uploads/2018/08/Adafruit_BMP280.zip
#include <DS3231.h>  // https://github.com/jarzebski/Arduino-DS3231/archive/master.zip

DS3231 clock;RTCDateTime DateTime;
Adafruit_BMP280 bmp; // I2C
  int an, segm,times,i,pd,pd_p,sek;
  byte a[4];
 
void setup(){  Wire.begin();clock.begin();bmp.begin();
MsTimer2::set(2, to_Timer);MsTimer2::start();
  // clock.setDateTime(__DATE__, __TIME__); // Устанавливаем время на часах, основываясь на времени компиляции скетча
 pinMode(9,OUTPUT);  // D9  === A0
 pinMode(10,OUTPUT); // D10 === A1
 pinMode(11,OUTPUT); // D11 === A2
 pinMode(12,OUTPUT); // D12 === A3
 pinMode(13,OUTPUT); // D13 === PD
 pinMode(2,OUTPUT);  // D2  === a
 pinMode(3,OUTPUT);  // D3  === b
 pinMode(4,OUTPUT);  // D4  === c
 pinMode(5,OUTPUT);  // D5  === d
 pinMode(6,OUTPUT);  // D6  === e
 pinMode(7,OUTPUT);  // D7  === f
 pinMode(8,OUTPUT);  // D8  === g
clock.setOutput(DS3231_1HZ);
 pinMode(A0,INPUT); // SQW DS3231 
}
 
void loop(){ 
  DateTime=clock.getDateTime();// опрос времени
  sek=DateTime.second;
  if((sek>=10&&sek<=15)||(sek>=30&&sek<=35)){
    times = bmp.readTemperature();
  a[0]=times/10;
  a[1]=times%10;
  a[2]=11;
  a[3]=12;
  pd_p=0;}
  else if((sek>=15&&sek<=20)||(sek>=35&&sek<=40)){
    times = bmp.readPressure()/133.3224;
  a[0]=13;
  a[1]=times/100;
  a[2]=times/10%10;
  a[3]=times%10;
  pd_p=0;}   
  else{
  times = DateTime.hour*100+DateTime.minute;
  a[0]=times/1000;
  a[1]=times/100%10;
  a[2]=times/10%10;
  a[3]=times%10%10;
  if(analogRead(A0)>900){pd_p=1;}else{pd_p=0;}
  }
 }// loop
 
void to_Timer(){ 
  switch(i){
    case 0: cl(); segm=a[0]; pd=0; an=0; anod(); segment();break;
    case 1: cl(); segm=a[1]; pd=pd_p; an=1; anod(); segment();break;
    case 2: cl(); segm=a[2]; pd=0; an=2; anod(); segment();break;
    case 3: cl(); segm=a[3]; pd=0; an=3; anod(); segment();break;}i++;
    if(i>3){i=0;}}
 
void segment(){
  switch(segm){                                                                 
             //  A       B       C       D       E       F       G        PD
    case 0: ch(2,1);ch(3,1);ch(4,1);ch(5,1);ch(6,1);ch(7,1);ch(8,0);ch(13,pd);break;// 0 
    case 1: ch(2,0);ch(3,1);ch(4,1);ch(5,0);ch(6,0);ch(7,0);ch(8,0);ch(13,pd);break;// 1
    case 2: ch(2,1);ch(3,1);ch(4,0);ch(5,1);ch(6,1);ch(7,0);ch(8,1);ch(13,pd);break;// 2
    case 3: ch(2,1);ch(3,1);ch(4,1);ch(5,1);ch(6,0);ch(7,0);ch(8,1);ch(13,pd);break;// 3   
    case 4: ch(2,0);ch(3,1);ch(4,1);ch(5,0);ch(6,0);ch(7,1);ch(8,1);ch(13,pd);break;// 4 
    case 5: ch(2,1);ch(3,0);ch(4,1);ch(5,1);ch(6,0);ch(7,1);ch(8,1);ch(13,pd);break;// 5 
    case 6: ch(2,1);ch(3,0);ch(4,1);ch(5,1);ch(6,1);ch(7,1);ch(8,1);ch(13,pd);break;// 6 
    case 7: ch(2,1);ch(3,1);ch(4,1);ch(5,0);ch(6,0);ch(7,0);ch(8,0);ch(13,pd);break;// 7 
    case 8: ch(2,1);ch(3,1);ch(4,1);ch(5,1);ch(6,1);ch(7,1);ch(8,1);ch(13,pd);break;// 8
    case 9: ch(2,1);ch(3,1);ch(4,1);ch(5,1);ch(6,0);ch(7,1);ch(8,1);ch(13,pd);break;// 9  
   case 10: ch(2,0);ch(3,0);ch(4,0);ch(5,0);ch(6,0);ch(7,0);ch(8,0);ch(13,pd);break;// пусто
   case 11: ch(2,1);ch(3,1);ch(4,0);ch(5,0);ch(6,0);ch(7,1);ch(8,1);ch(13,pd);break;// градус
   case 12: ch(2,1);ch(3,0);ch(4,0);ch(5,1);ch(6,1);ch(7,1);ch(8,0);ch(13,pd);break;// C
   case 13: ch(2,1);ch(3,1);ch(4,0);ch(5,0);ch(6,1);ch(7,1);ch(8,1);ch(13,pd);break;// P
   case 14: ch(2,0);ch(3,1);ch(4,1);ch(5,0);ch(6,1);ch(7,1);ch(8,1);ch(13,pd);break;// H
  }}
void anod(){
  switch(an){                                                             
    case 0:ch(9,1);ch(10,0);ch(11,0);ch(12,0);break;  
    case 1:ch(9,0);ch(10,1);ch(11,0);ch(12,0);break; 
    case 2:ch(9,0);ch(10,0);ch(11,1);ch(12,0);break;
    case 3:ch(9,0);ch(10,0);ch(11,0);ch(12,1);break;
  }}
 
void cl(){
     segm=10; pd=0; an=0; segment(); anod(); an=1; segment(); anod();  an=2; segment(); anod();  an=3; segment();anod(); 
  }  
 
  void ch(int pin, int logic){digitalWrite(pin,logic);}