Description:

In this project we build a Smart Watch using ESP32 Board. It is a very simple digital clock which shows day, date and time. We have used DS3231 Real Time Clock module to pull the current day, date and time. A 0.96” SPI OLED Display is used to view the thing and everything is controlled by ESP WROOM 32.

Circuit Diagram:

Components:

SR. NO.	COMPONENT	PINOUT DIAGRAM	BUY
1	ESP WROOM 32 Board	Arduino UNO Pinout Diagram⇗
2	0.96″ SPI OLED Display
3	DS3231 RTC Module

Steps and Info:

1. Get correct components as given. You can buy online or offline. I buy electronics components mostly from Amazon.

2. Start connecting the components. If you are new to connecting components in an electronic circuit, then use a Breadboard or you can straight up make connections using Jumper wires but it will create problem when there will be two or more connections needed at one pin (for example two or more different sensors 5V connection to Arduino’s 5V pin). But before soldering components on a PCB or printing a PCB for your circuit, better try using breadboard so that any errors and mistakes can be observed on breadboard and not after soldering. Or do connections in your way.

3. Now after building the circuit, download the Arduino IDE from https://www.arduino.cc/ website.

4. If you are new to Arduino IDE software, then watch this video we made specially for beginners about Arduino IDE.

5. If you know Arduino IDE then straight up copy the code we given and paste it into the Arduino IDE sketch.

6. Now if you don’t have ESP board installed in the Arduino IDE, then follow below steps or directly jump to step 8.

7. Click on File in the top Menu, Click on Preferences.

8. Now add the below URLs in ‘Additional Boards Manager URLs:’ box. The URLs have comma (,) in between them.

https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index.json

9. Click Ok.

10. Now click on Tools in the top Menu, click on Board, click on Boards Manager, Search “esp”, Install both files ‘esp32’ and ‘esp8266’ file.

11. Now go back to Tools again, go to boards, find ‘ESP32 Dev Module’ and select it.

12. Compile the code and Upload it.

13. If any error occurs then try to troubleshoot it by finding/copy-pasting it into our Solve Errors page https://electronicsprojects.in/solve-errors/, or you can straight up paste the error on Internet and you know the rest. Also check if there are no spelling/syntax errors in the code. Compile the code again once to check if errors are fixed. I have given proper connections and code but still nothing is perfect.

14. Once code compiles and uploads smoothly, you can start testing the working of your circuit/project.

15. Turn the circuit ON, current day, date and time will be displayed on the 0.96” SPI OLED display

16. If it doesn’t work, then check connections and code. Also you can talk with me and the community through discord. All the links to social is given at the right side of this page.

Program Code:

/* https://www.electronicsprojects.in Smart Watch using ESP 32, 0.96” OLED Display and DS3231 Real Time Clock Module */

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "RTClib.h"
RTC_DS3231 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
#define OLED_MOSI  23
#define OLED_CLK   18
#define OLED_DC    4
#define OLED_CS    5
#define OLED_RESET 2
Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
void setup() 
{
Serial.begin(9600);
if (! rtc.begin()) {
Serial.println("RTC not found");
while (1);
}
rtc.adjust(DateTime(__DATE__, __TIME__));
display.begin(SSD1306_SWITCHCAPVCC);
display.clearDisplay();
display.setTextColor(WHITE);
//display.startscrollright(0x00, 0x0F);
display.setTextSize(2);
display.setCursor(0,5);
display.print("  Clock ");
display.display();
delay(3000);
}
void loop()
{
DateTime now = rtc.now();
display.clearDisplay();
display.setTextSize(2);
display.setCursor(75,0);
display.println(now.second(), DEC);
display.setTextSize(2);
display.setCursor(25,0);
display.println(":");
display.setTextSize(2);
display.setCursor(65,0);
display.println(":");
display.setTextSize(2);
display.setCursor(40,0);
display.println(now.minute(), DEC);
display.setTextSize(2);
display.setCursor(0,0);
display.println(now.hour(), DEC);
display.setTextSize(1);
display.setCursor(0,15);
display.println(now.day(), DEC);
display.print(daysOfTheWeek[now.dayOfTheWeek()]);
display.setTextSize(1);
display.setCursor(25,15);
display.println("-");
display.setTextSize(1);
display.setCursor(40,15);
display.println(now.month(), DEC);
display.setTextSize(1);
display.setCursor(55,15);
display.println("-");
display.setTextSize(1);
display.setCursor(70,15);
display.println(now.year(), DEC);
display.display(); 
}

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