128x64 OLED display with Arduino UNO

Projects Programming
1

Hi,

I am building a project to display the date and time on a 128x64 OLED display with Arduino UNO.
I am using a GPS module(Ubloax 6M module) for date, time, and GPS co-ordinates. Below is my code and also I attached an image of my OLED screen.
I am seeing whenever in date/time any of the digits is less than 10 it is displayed as a single-digit (1, 2, 3..so on) I want it to display as 01 or 02 or 03....so on...if the digits are less than 10 it should be displayed with a prefix of 0.
How do I do this? what is the command for displaying two digits whenever the number is less than 10.
please suggest

#include <TinyGPS++.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SPI.h>
#include <Wire.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET 5

int ISThour = 0;
int ISTmin = 0;
int GMTmin = 0;
float latitude = 0;
float longitude = 0;

TinyGPSPlus gps;

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup()
{
Serial2.begin(9600);
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0, 0);
display.print("GPS SYSTEM");
display.setTextSize(1.5);
display.setCursor(0, 30);
display.setTextColor(WHITE);
display.print("INITIALISING...");
display.setCursor(0, 50);
display.print("Please Wait");
display.display();
delay(2000);
display.clearDisplay();
}

void loop()
{
while (Serial2.available() > 0)
if (gps.encode(Serial2.read()))
displayInfo();
if (millis() > 5000 && gps.charsProcessed() < 10)
{
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println(("No GPS signal"));
delay(1000);
display.clearDisplay();
}
}

void displayInfo()
{
//if (gps.time.isValid() && gps.date.isValid())
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println(("Date:"));
display.setCursor(33, 0);
display.println((gps.date.day()));
display.setCursor(47, 0);
display.println(("/"));
display.setCursor(57, 0);
display.println((gps.date.month()));
display.setCursor(67, 0);
display.println(("/"));
display.setCursor(77, 0);
display.println((gps.date.year()));

display.setCursor(0, 20);
display.println(("Time:"));
GMTmin = gps.time.minute();
ISThour = gps.time.hour() + 5;
if (GMTmin >= 30) ISThour = ISThour + 1;
if (ISThour > 24) ISThour = gps.time.hour() - 24;
ISTmin = gps.time.minute() + 30;
if (ISTmin >= 60) ISTmin = ISTmin - 60;
display.setCursor(35, 20);
display.println(ISThour);
display.setCursor(47, 20);
display.println(":");
display.setCursor(53, 20);
display.println(ISTmin);
display.setCursor(65, 20);
display.println(":");
display.setCursor(71, 20);
display.println((gps.time.second()));

latitude = gps.location.lat();
longitude = gps.location.lng();
display.setCursor(0, 35);
display.println(("Lat: "));
display.setCursor(30, 35);
display.println(latitude, 6);
display.setCursor(0, 45);
display.println(("Lng: "));
display.setCursor(30, 45);
display.println(longitude, 6);
display.display();
delay(1000);
display.clearDisplay();
}

Thanks
Santosh

Capture.PNG
Capture.PNG935×526 260 KB

Capture.PNG
Capture.PNG935×526 260 KB

2 
if (someValue < 10)
{
  Serial.print("0");
}
Serial.print(someValue);

Just to give you the idea.

Please note how I posted the code.

3 
  display.println((gps.date.day()));
  display.setCursor(47, 0);
  display.println(("/"));
  display.setCursor(57, 0);
  display.println((gps.date.month()));
  display.setCursor(67, 0);
  display.println(("/"));
  display.setCursor(77, 0);
  display.println((gps.date.year()));

On this part of the code, you can check first the values of each item, then print an extra "0" before printing it if it's less than 10

4

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