ARDUINO BASED TIME AND TEMPERATURE DISPLAY

2. INTRODUCTION
This project time and temperature display, displays
the time and temperature of surrounding. The
LM-35 Analog Temperature Sensor and RTC DS-
1307 is interfaced to analog pin of Arduino board,
where it has in built ADC which converts these
analog reading and displays it on LCD, which
indicate time and temperature of surrounding.

3. COMPONENT REQUIRE
 Arduino developed board
 Temperature sensor
 Time sensor
 LCD
 Breadboard
 Misc(wires,pot etc)

4. Arduino Board
 Arduino is a single-board microcontroller.
 There is a microcontroller unit embedded on it.
 The Arduino microcontroller is an easy to use yet
powerful single board
computer.
 The code is directly loaded
from the computer.

5. Arduino Board
 The Arduino is open-source, which means
hardware is reasonably priced and development
software is free.
 It has gained considerable traction in the hobby
and professional market.

6. LM 35 Temperature Sensor
 LM 35 are used to sense the heat around it.
 LM 35 digital sensor has got 3 pin’s i.e., VCC, GND
and output pin’s when LM 35 is heated the voltage
at output pin increases.
 It is connected to the analog to
digital convertor IC (ADC).

7. LM 35 Temperature Sensor
 The LM 35 series are precision
integrated-circuit temperature sensor,
whose output voltage is linearly
proportional to Celsius temperature.
 The LM 35 does not require any external
calibration or trimming to provide typical
accuracies of ±1⁄4˚C at room temperature and
±3⁄4˚C over a full −55 to +150˚C temperature
range.

8. Liquid Crystal Display(LCD)
 Most common LCDs connected to the
microcontrollers are 16x2 and 20x2 displays.
This means 16 characters per line by 2 lines and 20
characters per line by 2 lines, respectively.
It has a controller chip which receives data from an
external source and directly displays it on screen.

9. Liquid Crystal Display(LCD)
If an 8-bit data bus is used the LCD will require 11
data lines (3 control lines plus the 8 lines for the
data bus).
The three control lines are referred to as EN, RS,
and RW
 EN =Enable (used to tell the LCD that you are
sending it data).
 RS =Register Select (When RS is low (0), data is
treated as a command).
 (When RS is High(1), data being sent is text data ).

10. Liquid Crystal Display(LCD)
 R/W = Read/Write (When RW is low (0), the data
written to the LCD).
(When RW is low (1), the data reading to the LCD).

11. Real Time Clock
 RTC is an 8 pin device using an I2C interface.
The DS1307 is a low-power clock/calendar with 56
bytes of battery backup SRAM.
The clock/calendar provides seconds, minutes,
hours, day, date, month and year qualified data.
 The main advantage of RTC is that they have an
 arrangement of battery backup which
 keeps it running in case of power failure

12. Working Principle
 The heart of the circuit is an Arduino board which
controls all its functions.
 An IC LM35 is used as temperature sensor and
RTC ds-1307 is used as a time sensor.
 The LM-35 analog temperature and RTC 1307
device is interfaced to the analog pin of the
Arduino board.
 It’s built-in ADC, which converts these analog
reading and displays that on the LCD, to indicate
temperature and time of the surroundings.

13. Working Principle
 Time and temperature can be displayed in any
sequence as desired by doing changes in program
uploaded on Arduino.
 RTC also help in displaying day of week.

14. Circuit
 Inter facing of RTC with Arduino and LCD
Interfacing of LM 35 with Arduino and LCD

15. Reference
 This project is done with the reference of my ECE
teacher Miss Manie Kansal.
 http://www.alldatasheet.com/
http://www.engineersgarage.com/
https://m.youtube.com/watch?v=NDwSrgfsiYQ