Published April 15, 2021 © GPL3+

Arduino Clock (without rtc) with temperature and humidity

This project is a arduino clock made without using an rtc and it is totally accurate it also displays the temperature and the humidity

BeginnerFull instructions provided2 hours6,185

Arduino Clock (without rtc) with temperature and humidity

Things used in this project

Hardware components

DHT11 Temperature & Humidity Sensor (4 pins)

Solderless Breadboard Half Size

Arduino Nano 33 BLE Sense

DFRobot I2C 16x2 Arduino LCD Display Module

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

Don't mind the look of it but it works very fine I used the arduino nano as the programming board for the project You need to set the time in the code

Above the void setup

I am thinking to upgrade it with a few more things but till now I am just using a dht11 sensor with a LCD 16x2 along with an i2c module if you don't have a i2c module believe me you need to buy it saves alot of wire and effort and to me the wiring along with i2c is simple so I used it you can edit the code if you want to use normal lcd display

also I used the simple DHT library which makes working with the DHT11 sensor and I changed the increase rate of seconds to 0.50 as when I finalized it with arduino nano it started moving 1 second faster idk why

here

so for the connects I used a DHT 11 with 4 pins and here's its pinout

data pin goes to digital pin 11 as per the code and for the lcd

vcc goes to arduino 5v (same for the DHT11 sensor)

gnd goes to arduino gnd (same for the DHT11 sensor)

scl goes to A5

sda goes to A4

this is all for the project this was my first upload pardon me if any mistakes

thanks,

Code

Code

#include <SimpleDHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int h = Your  hours here;
int m = Your minutes here;
int s = seconds here;
int flag = 0;
int TIME = 0;
const int hs = A0;
const int ms = A1;
int state1 = 0;
int state2 = 0;
int pinDHT11 = 11;
SimpleDHT11 dht11(pinDHT11);

void setup()
{
   pinMode(hs,INPUT_PULLUP);
  pinMode(ms,INPUT_PULLUP);
  lcd.init();
  lcd.init();
  lcd.backlight();
  lcd.print("Made by - ");
 lcd.setCursor(0,1);
 lcd.print("Harshit");
 delay (3000);
 lcd.clear();
}
void loop()
{
  byte temperature = 0;
  byte humidity = 0;
  int err = SimpleDHTErrSuccess;
  if ((err = dht11.read(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess){
    return;
  }
  lcd.setCursor(0, 0);
  s = s + 0.50;
  lcd.print("TIME:" );
  lcd.print(h);
  lcd.print(":");
  lcd.print(m);
  lcd.print(":");
  lcd.print(s);
  if (flag < 12) lcd.print(" AM");
  if (flag == 12) lcd.print(" PM");
  if (flag > 12) lcd.print(" PM");
  if (flag == 24) flag = 0;
  delay(1000);
 lcd.clear();
  if (s == 60)
  {
    s = 0;
    m = m + 1;
  }
  if (m == 60)
  {
    m = 0;
    h = h + 1;
    flag = flag + 1;
  }
  if (h == 13)
  {
    h = 1;
  }
  state1 = digitalRead(hs);
  if (state1 == 0)
  {
    h = h + 1;
    flag = flag + 1;
    if (flag < 12) lcd.print(" AM");
    if (flag == 12) lcd.print(" PM");
    if (flag > 12) lcd.print(" PM");
    if (flag == 24) flag = 0;
    if (h == 13) h = 1;
  }
  state2 = digitalRead(ms);
  if (state2 == 0)
  {
    s = 0;
    m = m + 1;
  }

 s=s+1;
 if(s==60){
  s=0;
  m=m+1;
 }
 if(m==60)
 {
  m=0;
  h=h+1;
 }
 if(h==13)
 {
  h=1;
  flag=flag+1;
  if(flag==2)flag=0;
 }
  lcd.setCursor(0,1);
  lcd.print("Temp= ");
  lcd.setCursor(5,1);
  lcd.print((int)temperature);
  lcd.setCursor(7,1);
  lcd.print("C");
  lcd.setCursor (9,1);
  lcd.print("H=");
  lcd.setCursor(11,1);
  lcd.print((int)humidity);
  lcd.setCursor(13,1);
  lcd.print("%");
}

Credits

harshitmehra2007

3 projects • 2 followers

Arduino Clock (without rtc) with temperature and humidity

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

The connections

Code

Code

Credits

harshitmehra2007

Comments

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Arduino Clock (without rtc) with temperature and humidity

Arduino Clock (without rtc) with temperature and humidity

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

The connections

Code

Code

Credits

harshitmehra2007

Comments

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