Digital clock USING ARDUINO UNO

1// DS1302:  RST pin    -> Arduino Digital 2
2//          DATA pin   ->  Arduino Digital 3
3//          CLK pin  -> Arduino Digital 4
4 
5#include  <DS1302.h>
6#include <LiquidCrystal.h> 
7
8#define RST_pin 2 //  -> Arduino  Digital 2
9#define DATA_pin 3 //  -> Arduino Digital 3
10#define CLK_pin  4 //->  Arduino Digital 4
11DS1302 rtc(RST_pin, DATA_pin, CLK_pin);
12
13
14#define  VSS_PIN // –> GND Arduino
15#define VDP_PIN // –> 5V Arduino
16#define VO_PIN  // –> output potentiometer (potentiometer VCC -> 5V Arduino, potentiometer GND ->  Arduino GND).
17#define RS_PIN 12 // –> pin 12 Arduino
18#define RW_PIN  // –>  GND Arduino
19#define E_PIN 11 // –> pin 11 Arduino
20#define D4_PIN 5 // –> pin  5 Arduino 
21#define D5_PIN 6 // –> pin 6 Arduino
22#define D6_PIN 7 // –> pin  7 Arduino
23#define D7_PIN 8 // –> pin 8 Arduino
24#define A_PIN // –> 5V Arduino  with 1.2 k resistor
25#define K_PIN // –> GND Arduino 
26
27
28
29
30LiquidCrystal  lcd(RS_PIN, E_PIN,D4_PIN,D5_PIN ,D6_PIN , D7_PIN  ); 
31
32
33  
34
35void  setup()
36{
37
38rtc.halt(false);
39  rtc.writeProtect(false);
40  rtc.setDOW(WEDNESDAY);       
41  rtc.setTime(3, 41,
42  
43  
44  00      );           
45  rtc.setDate(17,  9, 2020);    
46  rtc.writeProtect(true); 
47    
48    Serial.begin(9600) ;
49  }
50
51void loop()
52{
53  Serial.println(rtc.getDateStr(FORMAT_LONG,FORMAT_LITTLEENDIAN,  '/'));
54  Serial.println(rtc.getDOWStr());
55  Serial.println(rtc.getTimeStr());
56  lcd.begin(16,2); 
57  lcd.clear();
58    lcd.print(rtc.getTimeStr());
59     lcd.setCursor(0,1);  
60  lcd.print(rtc.getDateStr(FORMAT_LONG,FORMAT_LITTLEENDIAN, '/')); 
61
62   delay (5000);
63
64   lcd.begin(16,2); 
65  lcd.clear();
66    lcd.print("CLOCK");
67     lcd.setCursor(0,1);  
68
69  delay (3000);
70}