DIY minimalistic programmable Arduino wristwatch

Craft your own Arduino watch, combining creativity with functionality.

Feb 25, 2024

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5367 views

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4 respects

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Clocks

Smartwatches

Wearables

Components and supplies

Arduino pro Mini 3v

0.91" I2C OLED 128x32

USB Cable, USB Type C Plug

Battery Lipo 500 mAh

Female Header Pins

TP4056 Micro USB 5V 1A Li - Ion Battery Charger Module (AZDelivery)

Tactile button

Adafruit RTC DS3231 Real time clock

Tools and machines

Digital Multimeter

Soldering kit

Apps and platforms

Arduino IDE 2.0 (beta)

SOLIDWORKS

Project description

Code

arduino_watch_3.o

code

1#include <RTClib.h>
2#include <Wire.h>
3#include <Adafruit_GFX.h>
4#include <Adafruit_SSD1306.h>
5#include "TomThumb.h"
6#define SCREEN_WIDTH 128
7#define SCREEN_HEIGHT 32
8#define SCREEN_ADDRESS 0x3C
9
10Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
11RTC_DS3231 rtc;
12char t[10];
13char t2[10];
14char d[10];
15const char* daysOfTheWeek[] = {"SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY"};
16const char* monthname[] = {"JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST", "OCTOBER", "OCTOBER", "NOVEMBER", "DECEMBER"};
17int year = 2024;
18int month = 02;
19int day = 25;
20int hour = 8;
21int minute = 46;
22int second = 00;
23char pmam[3];
24const int buttonPin1 = 8;
25int buttonState1 = HIGH;
26int lastButtonState1 = HIGH;
27int pressCount1 = 0;
28const int buttonPin2 = 7;
29int buttonState2 = HIGH;
30int lastButtonState2 = HIGH;
31int pressCount2 = 0;
32const int buttonPin3 = 9;
33int buttonState3 = HIGH;
34int lastButtonState3 = HIGH;
35int timeb, dateb, battb = 0;
36const int buttonPins = 6;
37#define voltmeter A0
38double offset = 0.09;
39
40const uint8_t sign [] PROGMEM = {
41  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
42  0x00, 0x00, 0x00, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
43  0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44  0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45  0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47  0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
48  0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49  0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
50  0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51  0x00, 0x00, 0x00, 0x05, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52  0x00, 0x00, 0x00, 0x1F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
53  0x00, 0x00, 0x00, 0x28, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
54  0x00, 0x00, 0x00, 0x48, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
55  0x00, 0x00, 0x00, 0xC8, 0x40, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
56  0x00, 0x00, 0x00, 0x38, 0x78, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
57  0x00, 0x00, 0x00, 0x0F, 0xA7, 0x80, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
58  0x00, 0x00, 0x00, 0x08, 0x11, 0x00, 0x02, 0x00, 0x03, 0x81, 0xBF, 0x80, 0x00, 0x00, 0x00, 0x00,
59  0x00, 0x00, 0x00, 0x10, 0x12, 0x00, 0x02, 0x00, 0x03, 0x82, 0xE0, 0xC0, 0x00, 0x00, 0x00, 0x00,
60  0x00, 0x00, 0x00, 0x10, 0x0C, 0x00, 0x02, 0x03, 0x80, 0xE6, 0x40, 0x60, 0x00, 0x00, 0x00, 0x00,
61  0x00, 0x00, 0x00, 0x10, 0x08, 0x00, 0x02, 0x07, 0x01, 0xBC, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
62  0x00, 0x00, 0x01, 0xD0, 0x14, 0x00, 0x02, 0x66, 0x63, 0x08, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00,
63  0x00, 0x00, 0x00, 0x3F, 0xE4, 0x00, 0x06, 0xFE, 0x7E, 0x18, 0x00, 0x1C, 0x32, 0x00, 0x00, 0x00,
64  0x00, 0x00, 0x00, 0x10, 0x02, 0x01, 0x87, 0x82, 0xD8, 0x00, 0x00, 0x06, 0x02, 0x00, 0x00, 0x00,
65  0x00, 0x00, 0x00, 0x10, 0x02, 0x03, 0x4D, 0x03, 0x80, 0x00, 0x00, 0x06, 0x3F, 0x00, 0x00, 0x00,
66  0x00, 0x00, 0x00, 0x20, 0x01, 0x02, 0xF9, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x01, 0x00, 0x00, 0x00,
67  0x00, 0x00, 0x00, 0x20, 0x01, 0x02, 0xB0, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x81, 0x00, 0x00, 0x00,
68  0x00, 0x00, 0x00, 0x20, 0x00, 0x83, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00,
69  0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
70  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
71  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
72  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
73};
74
75
76void setup()
77{
78  Serial.begin(9600);
79  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
80  display.clearDisplay();
81  Wire.begin();
82  pinMode(buttonPin1, INPUT_PULLUP);
83  pinMode(buttonPin2, INPUT_PULLUP);
84  pinMode(buttonPins, INPUT_PULLUP);
85  //pinMode(press, INPUT_PULLUP);
86  //pinMode(lpb, INPUT_PULLUP);
87  //pinMode(rpb, INPUT_PULLUP);
88  rtc.begin();
89  //rtc.adjust(DateTime(F(__DATE__),F(__TIME__)));
90  rtc.adjust(DateTime(year, month, day, hour, minute, second));
91  pinMode(voltmeter, INPUT);
92}
93void loop()
94{
95
96  DateTime now = rtc.now();
97
98  sprintf(t2, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());
99
100  //sprintf(t, "%02d:%02d:%02d %02d/%02d/%02d", now.hour(), now.minute(), now.second(), now.day(), now.month(), now.year());
101  if (now.hour() >= 13) {
102    sprintf(t, "%02d:%02d:%02d", now.hour() - 12, now.minute(), now.second());
103    sprintf(pmam, "%c%c", 'P', 'M');
104  }
105  else if (now.hour() == 00) {
106    sprintf(t, "%02d:%02d:%02d", now.hour() + 12, now.minute(), now.second());
107    sprintf(pmam, "%c%c", 'P', 'M');
108  }
109  else {
110    sprintf(t, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());
111    sprintf(pmam, "%c%c", 'A', 'M');
112  }
113  sprintf(d, "%02d/%02d", now.day(), now.month());
114
115  buttonState1 = digitalRead(buttonPin1);
116
117  if (buttonState1 == LOW && lastButtonState1 == HIGH) {
118    delay(90);
119
120    if (buttonState1 == LOW) {
121      pressCount1++;
122      Serial.println(pressCount1);
123      if (pressCount1 == 2) {
124        pressCount1 = 0;
125      }
126    }
127  }
128  lastButtonState1 = buttonState1;
129
130  buttonState2 = digitalRead(buttonPin2);
131
132  if (buttonState2 == LOW && lastButtonState2 == HIGH) {
133    delay(90);
134
135    if (buttonState2 == LOW) {
136      pressCount2++;
137      Serial.println(pressCount2);
138      if (pressCount2 == 3 ) {
139        pressCount2 = 0;
140      }
141    }
142  }
143  lastButtonState2 = buttonState2;
144
145
146  if (pressCount1 == 0) {
147    buttonState3 = digitalRead(buttonPin3);
148    display.ssd1306_command(SSD1306_DISPLAYOFF);
149  }
150
151  else {
152    display.ssd1306_command(SSD1306_DISPLAYON);
153    if (digitalRead(buttonPins) == 0) {
154      //display.ssd1306_command(SSD1306_DISPLAYON);
155      display.clearDisplay();
156      display.setTextColor(WHITE);
157      display.setTextSize(1);
158      display.setFont(NULL);
159      display.drawBitmap(0, 0, sign, 128, 32, 1);
160      display.display();
161    }
162    else if (pressCount2 == 0) {
163
164      buttonState3 = digitalRead(buttonPin3);
165
166      if (buttonState3 == LOW && lastButtonState3 == HIGH) {
167        delay(90);
168
169        if (buttonState3 == LOW) {
170          timeb++;
171          Serial.println(timeb);
172          if (timeb == 2 )
173            timeb = 0;
174        }
175      }
176      lastButtonState3 = buttonState3;
177      if (timeb == 0) {
178        display.clearDisplay();
179        display.setTextColor(WHITE);
180        display.setTextSize(2);
181        display.setFont(&TomThumb);
182        display.setCursor(0, 10);
183        display.println("TIME: (24F)");
184        display.setTextSize(3);
185        display.setCursor(27, 27);
186        display.print(t2);
187        display.display();
188      }
189      else {
190        display.clearDisplay();
191        display.setTextColor(WHITE);
192        display.setTextSize(2);
193        display.setFont(&TomThumb);
194        display.setCursor(0, 10);
195        display.println("TIME:");
196        display.setTextSize(3);
197        display.setCursor(27, 27);
198        display.print(t);
199        display.setTextSize(1);
200        display.print(pmam);
201        display.display();
202      }
203    }
204
205    else if (pressCount2 == 1) {
206      buttonState3 = digitalRead(buttonPin3);
207
208      if (buttonState3 == LOW && lastButtonState3 == HIGH) {
209        delay(90);
210
211        if (buttonState3 == LOW) {
212          dateb++;
213          Serial.println(dateb);
214          if (dateb == 3 )
215            dateb = 0;
216        }
217      }
218      lastButtonState3 = buttonState3;
219
220      if (dateb == 1) {
221        display.clearDisplay();
222        display.setTextColor(WHITE);
223        display.setTextSize(2);
224        display.setFont(&TomThumb);
225        display.setCursor(0, 10);
226        display.println("DAY:");
227        display.setTextSize(3);
228        display.setCursor(8, 27);
229        display.print(daysOfTheWeek[now.dayOfTheWeek()]);
230        display.display();
231      }
232      else if (dateb == 2) {
233
234        display.clearDisplay();
235        display.setTextColor(WHITE);
236        display.setTextSize(2);
237        display.setFont(&TomThumb);
238        display.setCursor(0, 10);
239        display.println("MONTH:");
240        display.setTextSize(3);
241        display.setCursor(8, 27);
242        display.print(monthname[month - 1]);
243        display.display();
244      }
245      else {
246        display.clearDisplay();
247        display.setTextColor(WHITE);
248        display.setTextSize(2);
249        display.setFont(&TomThumb);
250        display.setCursor(0, 10);
251        display.println("DATE:");
252        display.setTextSize(3);
253        display.setCursor(37, 27);
254        display.print(d);
255        display.display();
256      }
257    }
258    else if (pressCount2 == 2) {
259      buttonState3 = digitalRead(buttonPin3);
260
261      if (buttonState3 == LOW && lastButtonState3 == HIGH) {
262        delay(90);
263
264        if (buttonState3 == LOW) {
265          battb++;
266          Serial.println(dateb);
267          if (battb == 3 )
268            battb = 0;
269        }
270      }
271      int volt = analogRead(voltmeter);
272      //double voltage = map(volt, 0, 1024, 0, 2500);
273      double voltage = (volt / 1023.0)* 5.0;
274      voltage = voltage + 2.64;
275      lastButtonState3 = buttonState3;
276      display.clearDisplay();
277      display.setTextColor(WHITE);
278      display.setTextSize(2);
279      display.setFont(&TomThumb);
280      display.setCursor(0, 10);
281      display.print("BATTERY: ");
282      display.print(voltage, 1);
283      display.print("v");
284      delay(100);
285      display.drawRect(18, 12, 80, 20, 1);
286      display.drawRect(97, 17, 5, 10, 1);
287      if (voltage <= 2.99)
288        display.fillRect(19, 12, 10, 20, 1);
289      else if (voltage >= 3.00 && voltage <= 3.20 )
290        display.fillRect(19, 12, 20, 20, 1);
291      else if (voltage >= 3.21 && voltage <= 3.50 )
292        display.fillRect(19, 12, 40, 20, 1);
293      else if (voltage >= 3.51 && voltage <= 3.80 )
294        display.fillRect(19, 12, 60, 20, 1);
295      else if (voltage >= 3.81 && voltage <= 4.30 )
296        display.fillRect(19, 12, 80, 20, 1);
297      display.display();
298    }
299  }
300}

#include <RTClib.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "TomThumb.h"
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
RTC_DS3231 rtc;
char t[10];
char t2[10];
char d[10];
const char* daysOfTheWeek[] = {"SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY"};
const char* monthname[] = {"JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST", "OCTOBER", "OCTOBER", "NOVEMBER", "DECEMBER"};
int year = 2024;
int month = 02;
int day = 25;
int hour = 8;
int minute = 46;
int second = 00;
char pmam[3];
const int buttonPin1 = 8;
int buttonState1 = HIGH;
int lastButtonState1 = HIGH;
int pressCount1 = 0;
const int buttonPin2 = 7;
int buttonState2 = HIGH;
int lastButtonState2 = HIGH;
int pressCount2 = 0;
const int buttonPin3 = 9;
int buttonState3 = HIGH;
int lastButtonState3 = HIGH;
int timeb, dateb, battb = 0;
const int buttonPins = 6;
#define voltmeter A0
double offset = 0.09;

const uint8_t sign [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x05, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x1F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x28, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x48, 0x80, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0xC8, 0x40, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x38, 0x78, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x0F, 0xA7, 0x80, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x08, 0x11, 0x00, 0x02, 0x00, 0x03, 0x81, 0xBF, 0x80, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x10, 0x12, 0x00, 0x02, 0x00, 0x03, 0x82, 0xE0, 0xC0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x10, 0x0C, 0x00, 0x02, 0x03, 0x80, 0xE6, 0x40, 0x60, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x10, 0x08, 0x00, 0x02, 0x07, 0x01, 0xBC, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x01, 0xD0, 0x14, 0x00, 0x02, 0x66, 0x63, 0x08, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x3F, 0xE4, 0x00, 0x06, 0xFE, 0x7E, 0x18, 0x00, 0x1C, 0x32, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x10, 0x02, 0x01, 0x87, 0x82, 0xD8, 0x00, 0x00, 0x06, 0x02, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x10, 0x02, 0x03, 0x4D, 0x03, 0x80, 0x00, 0x00, 0x06, 0x3F, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x20, 0x01, 0x02, 0xF9, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x01, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x20, 0x01, 0x02, 0xB0, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x81, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x20, 0x00, 0x83, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


void setup()
{
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  display.clearDisplay();
  Wire.begin();
  pinMode(buttonPin1, INPUT_PULLUP);
  pinMode(buttonPin2, INPUT_PULLUP);
  pinMode(buttonPins, INPUT_PULLUP);
  //pinMode(press, INPUT_PULLUP);
  //pinMode(lpb, INPUT_PULLUP);
  //pinMode(rpb, INPUT_PULLUP);
  rtc.begin();
  //rtc.adjust(DateTime(F(__DATE__),F(__TIME__)));
  rtc.adjust(DateTime(year, month, day, hour, minute, second));
  pinMode(voltmeter, INPUT);
}
void loop()
{

  DateTime now = rtc.now();

  sprintf(t2, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());

  //sprintf(t, "%02d:%02d:%02d %02d/%02d/%02d", now.hour(), now.minute(), now.second(), now.day(), now.month(), now.year());
  if (now.hour() >= 13) {
    sprintf(t, "%02d:%02d:%02d", now.hour() - 12, now.minute(), now.second());
    sprintf(pmam, "%c%c", 'P', 'M');
  }
  else if (now.hour() == 00) {
    sprintf(t, "%02d:%02d:%02d", now.hour() + 12, now.minute(), now.second());
    sprintf(pmam, "%c%c", 'P', 'M');
  }
  else {
    sprintf(t, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());
    sprintf(pmam, "%c%c", 'A', 'M');
  }
  sprintf(d, "%02d/%02d", now.day(), now.month());

  buttonState1 = digitalRead(buttonPin1);

  if (buttonState1 == LOW && lastButtonState1 == HIGH) {
    delay(90);

    if (buttonState1 == LOW) {
      pressCount1++;
      Serial.println(pressCount1);
      if (pressCount1 == 2) {
        pressCount1 = 0;
      }
    }
  }
  lastButtonState1 = buttonState1;

  buttonState2 = digitalRead(buttonPin2);

  if (buttonState2 == LOW && lastButtonState2 == HIGH) {
    delay(90);

    if (buttonState2 == LOW) {
      pressCount2++;
      Serial.println(pressCount2);
      if (pressCount2 == 3 ) {
        pressCount2 = 0;
      }
    }
  }
  lastButtonState2 = buttonState2;


  if (pressCount1 == 0) {
    buttonState3 = digitalRead(buttonPin3);
    display.ssd1306_command(SSD1306_DISPLAYOFF);
  }

  else {
    display.ssd1306_command(SSD1306_DISPLAYON);
    if (digitalRead(buttonPins) == 0) {
      //display.ssd1306_command(SSD1306_DISPLAYON);
      display.clearDisplay();
      display.setTextColor(WHITE);
      display.setTextSize(1);
      display.setFont(NULL);
      display.drawBitmap(0, 0, sign, 128, 32, 1);
      display.display();
    }
    else if (pressCount2 == 0) {

      buttonState3 = digitalRead(buttonPin3);

      if (buttonState3 == LOW && lastButtonState3 == HIGH) {
        delay(90);

        if (buttonState3 == LOW) {
          timeb++;
          Serial.println(timeb);
          if (timeb == 2 )
            timeb = 0;
        }
      }
      lastButtonState3 = buttonState3;
      if (timeb == 0) {
        display.clearDisplay();
        display.setTextColor(WHITE);
        display.setTextSize(2);
        display.setFont(&TomThumb);
        display.setCursor(0, 10);
        display.println("TIME: (24F)");
        display.setTextSize(3);
        display.setCursor(27, 27);
        display.print(t2);
        display.display();
      }
      else {
        display.clearDisplay();
        display.setTextColor(WHITE);
        display.setTextSize(2);
        display.setFont(&TomThumb);
        display.setCursor(0, 10);
        display.println("TIME:");
        display.setTextSize(3);
        display.setCursor(27, 27);
        display.print(t);
        display.setTextSize(1);
        display.print(pmam);
        display.display();
      }
    }

    else if (pressCount2 == 1) {
      buttonState3 = digitalRead(buttonPin3);

      if (buttonState3 == LOW && lastButtonState3 == HIGH) {
        delay(90);

        if (buttonState3 == LOW) {
          dateb++;
          Serial.println(dateb);
          if (dateb == 3 )
            dateb = 0;
        }
      }
      lastButtonState3 = buttonState3;

      if (dateb == 1) {
        display.clearDisplay();
        display.setTextColor(WHITE);
        display.setTextSize(2);
        display.setFont(&TomThumb);
        display.setCursor(0, 10);
        display.println("DAY:");
        display.setTextSize(3);
        display.setCursor(8, 27);
        display.print(daysOfTheWeek[now.dayOfTheWeek()]);
        display.display();
      }
      else if (dateb == 2) {

        display.clearDisplay();
        display.setTextColor(WHITE);
        display.setTextSize(2);
        display.setFont(&TomThumb);
        display.setCursor(0, 10);
        display.println("MONTH:");
        display.setTextSize(3);
        display.setCursor(8, 27);
        display.print(monthname[month - 1]);
        display.display();
      }
      else {
        display.clearDisplay();
        display.setTextColor(WHITE);
        display.setTextSize(2);
        display.setFont(&TomThumb);
        display.setCursor(0, 10);
        display.println("DATE:");
        display.setTextSize(3);
        display.setCursor(37, 27);
        display.print(d);
        display.display();
      }
    }
    else if (pressCount2 == 2) {
      buttonState3 = digitalRead(buttonPin3);

      if (buttonState3 == LOW && lastButtonState3 == HIGH) {
        delay(90);

        if (buttonState3 == LOW) {
          battb++;
          Serial.println(dateb);
          if (battb == 3 )
            battb = 0;
        }
      }
      int volt = analogRead(voltmeter);
      //double voltage = map(volt, 0, 1024, 0, 2500);
      double voltage = (volt / 1023.0)* 5.0;
      voltage = voltage + 2.64;
      lastButtonState3 = buttonState3;
      display.clearDisplay();
      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setFont(&TomThumb);
      display.setCursor(0, 10);
      display.print("BATTERY: ");
      display.print(voltage, 1);
      display.print("v");
      delay(100);
      display.drawRect(18, 12, 80, 20, 1);
      display.drawRect(97, 17, 5, 10, 1);
      if (voltage <= 2.99)
        display.fillRect(19, 12, 10, 20, 1);
      else if (voltage >= 3.00 && voltage <= 3.20 )
        display.fillRect(19, 12, 20, 20, 1);
      else if (voltage >= 3.21 && voltage <= 3.50 )
        display.fillRect(19, 12, 40, 20, 1);
      else if (voltage >= 3.51 && voltage <= 3.80 )
        display.fillRect(19, 12, 60, 20, 1);
      else if (voltage >= 3.81 && voltage <= 4.30 )
        display.fillRect(19, 12, 80, 20, 1);
      display.display();
    }
  }
}

Downloadable files

Bottom_part

STL file

bott.STL

Top_part

STL file

topp.STL

Documentation

circuit diagram

fritzing

arduino_watch_bb.png

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