Arduino: LCD 1602 very Simple Clock
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/* Arduino 'Clock' with LCD (20x4) I2C.
This I2C LCD backpack contains the PCF8574 port-expander
IC. Beware that this sketch can work with backpacks that
contains this IC, but may not work with variations.
Components:
- Arduino Uno
- LCD I2C (20x4)
Libraries:
- LiquidCrystal_I2C library
Created on 25 June 2022 by c010rblind3ngineer
*/
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int a_sec = 900; // clock second hand
int Hrs, Mins;
int Secs = 0;
String AmPm; // to store the string data to display 'AM' or 'PM'
int ampm; // to store user input
int day, d, m, yr;
// char *DAYS[] = { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat", "Sun" };
// char *MONTHS[] = { "Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sep", "Oct", "Nov", "Dec" };
String DAYS[] = { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat", "Sun" };
String MONTHS[] = { "Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sep", "Oct", "Nov", "Dec" };
void setup()
{
Serial.begin(9600);
lcd.init();
lcd.backlight();
clkInit();
}
void loop()
{
//...Display Time to LCD...
lcd.setCursor(3, 1);
// lcd.print(" ");
printolcd(Hrs);
lcd.print(":");
printolcd(Mins);
lcd.print(":");
printolcd(Secs);
lcd.print(AmPm);
//...Clock starts...
Secs++;
if (Secs == 60) {
Secs = 0;
Mins++;
}
if (Mins == 60) {
Mins = 0;
Hrs++;
}
if (Hrs == 13) {
Hrs = 1;
}
if (Hrs == 12 && Mins == 00 && Secs == 00) {
if (AmPm == " AM") {
AmPm = " PM";
}
else {
AmPm = " AM";
d++;
reset_dom(m); // reset the day to 1 when the days of the month exceed it's limit
//...Reset LCD row 0 and update date...
lcd.setCursor(0, 0);
lcd.print(" ");
lcd.setCursor(0, 0);
lcd.print(DAYS[day]); // mon, tues, wed... etc.
lcd.print(", ");
printolcd(d);
lcd.print(" ");
lcd.print(MONTHS[m - 1]);
lcd.print(" ");
lcd.print(yr);
day++;
}
}
delay(a_sec); // delay acts as the clock second hand
}
///////////////////////////////////////
////Initialise the 'clock' settings////
///////////////////////////////////////
void clkInit() {
Serial.println("What is the day today? (1 - 7)");
Serial.println("\t(1) Monday\n\t(2) Tuesday\n\t(3) Wednesday\n\t(4) Thursday\n\t(5) Friday\n\t(6) Saturday\n\t(7) Sunday");
while (Serial.available() == 0) {}; // wait for user input
day = Serial.parseInt(); // store what day is today in integer variable 'day'
delay(500);
Serial.println("\nWhat is today's date?");
Serial.print("Day (1 - 31): ");
while (Serial.available() == 0) {}; // wait for user input
d = Serial.parseInt(); // store day in integer variable 'd'
printoserial(d);
Serial.print("\nMonth (1 - 12): ");
while (Serial.available() == 0) {}; // wait for user input
m = Serial.parseInt(); // store month in integer variable 'm'
Serial.print(MONTHS[m - 1]);
Serial.print("\nYear (YYYY): ");
while (Serial.available() == 0) {}; // wait for user input
yr = Serial.parseInt(); // store year in integer variable 'yr'
Serial.print(yr);
delay(500);
Serial.print("\n\n\tToday is ");
Serial.print(DAYS[day - 1]);
Serial.print(", ");
printoserial(d);
Serial.print(" ");
Serial.print(MONTHS[m - 1]);
Serial.print(" ");
Serial.print(yr);
Serial.print("\n\nIs it - (1)AM or (2)PM ?");
while (Serial.available() == 0) {};
ampm = Serial.parseInt();
delay(500);
if (ampm == 1) {
AmPm = "AM";
Serial.print("\nClock set to AM\n\n");
}
if (ampm == 2) {
AmPm = "PM";
Serial.print("\nClock set to PM\n\n");
}
delay(500);
Serial.print("Input Hours (1 - 12) : ");
while (Serial.available() == 0) {} // wait till the user inputs data
Hrs = Serial.parseInt();
printoserial(Hrs);
delay(500);
Serial.print("\nInput Minutes (0 - 59) : ");
while (Serial.available() == 0) {} // wait till the user inputs data
Mins = Serial.parseInt();
printoserial(Mins);
delay(500);
Serial.print("\n\n\tClock set to : ");
//...Display time to Serial Monitor...
printoserial(Hrs);
Serial.print(":");
printoserial(Mins);
Serial.print(AmPm);
//... Display Date to LCD...
lcd.setCursor(0, 0);
lcd.print(DAYS[day - 1]);
lcd.print(", ");
printolcd(d);
lcd.print(" ");
lcd.print(MONTHS[m - 1]);
lcd.print(" ");
lcd.print(yr);
}
//////////////////////////////////////////////////////////////////////////
////To put an extra '0' infront of the variables on the Serial Monitor////
//////////////////////////////////////////////////////////////////////////
void printoserial(int val)
{
if (val < 10) {
Serial.print("0");
Serial.print(val);
}
else {
Serial.print(val);
}
}
///////////////////////////////////////////////////////////////
////To put an extra '0' infront of the variables on the LCD////
///////////////////////////////////////////////////////////////
void printolcd(int val)
{
if (val < 10) {
lcd.print("0");
lcd.print(val);
}
else {
lcd.print(val);
}
}
void reset_dom(int var) {
switch (var) {
case 1: // Jan - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
case 2: // Feb - 28 days
if (d == 29) {
d = 1;
m++;
}
break;
case 3: // March - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
case 4: // April - 30 days
if (d == 31) {
d = 1;
m++;
}
break;
case 5: // May - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
case 6: // June - 30 days
if (d == 31) {
d = 1;
m++;
}
break;
case 7: // July - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
case 8: // August - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
case 9: // September - 30 days
if (d == 31) {
d = 1;
m++;
}
break;
case 10: // October - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
case 11: // November - 30 days
if (d == 31) {
d = 1;
m++;
}
break;
case 12: // December - 31 days
if (d == 32) {
d = 1;
m++;
}
break;
}
}