This document describes a temperature monitoring system created by a group of students at the Modern Institute of Technology & Research Centre Alwar. The system uses an LM35 temperature sensor, ATMega328 microcontroller, LCD display, relays, and GSM module to sense, display, and control temperature. Temperature readings can be sent via SMS to remotely monitor temperature. The system provides accurate, low-cost temperature monitoring and control for applications like industrial plants, greenhouses, and more.

1. GROUP MEMBER
ABHILASH SHARMA
ABHISHEKANAND SHARMA
GOLDI SIKANDAR
MAHENDRA SAINI
NAVEEN SHARMA
ON
MODERN INSTITUTE OF TECHNOLOGY & RESEARCH CENTRE ALWAR
GUIDED BY
DEEPAK SHARMA
ASST PROF OF
ECE DEPARTENT

2.  INTRODUCTION
 COMPONENT
 CIRCUIT DIAGRAM
 PIN CONFIGURATION
 WORKING
 APPLICATION
 ADVANTAGES
 DISADVANTAGE
 CONCLUSION
 REFERENCES
CONTENT
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3. • The temperature monitoring system is an integrated device that
allow users to input specific requirement of temperature for any
environment.
• The purpose of this project is to explore the possibility to
continuously monitor temperature.
• LM35 temperature sensor is used to sense the temperature.
Microcontroller ATMega328 is used as the heart of this system
which holds the monitoring and controlling program and the
temperature is displayed on an LCD screen.
•For controlling the temperature, relays are used which are
connected to a heater and a cooler.
2

4. COMPONENT
S. NO. COMPONENT QUANTITY PRICE(Rs)
1
RESISTOR
1 (1k)
1
2
CAPACITOR
3 (22pf,10uf,100uf) 5
3
ATMEGA328 microcontroller
1 300
4
GSM module (SIM900)
1 1200
5
LCD 16x2
1 50
6
12v adapter for GSM module
1 300
7
16MHz crystal
1 20
8
7805 voltage regulator
1 10
9
LM35 temp. sensor
1 40
10
9v battery
1 10
3

5. 4

6. FIG:2 CIRCUIT DIAGRAM
5

7. Pin diagram- Circuit diagram
FEATURES :-
• Input voltage - 7-12V
• 14 Digital I/O Pins (6 PWM outputs)
• 6 Analog Inputs
• 32k Flash Memory
• 16Mhz Clock Speed 16
●Arduino is an open-source electronics prototyping platform based on flexible, easy-to-
use hardware and software.
●Arduino hardware is programmed using a Wiring-based language (syntax and libraries),
similar to C++ with some slight simplifications.
●Arduino can sense the environment by receiving input from a variety of sensors and can
affect its surroundings by controlling lights, motors, and other actuators.
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8. GSM MODULE(SIM900)
• The development of GSM network, it can
easily connect the sensor with GSM network
•We don’t need to be present near the sensor in order to view the
temperature.
•To monitor the real time temperature send the SMS “temp” on that
number which inserted in GSM module.
• When the GSM module receive this SMS it give this SMS to the
microcontroller. Microcontroller connected to the temperature
sensor.
•Microcontroller receive the temperature value through temperature
sensor and create a SMS and send to the same number.
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9. LM35
FIG 1. LM35
8

10. ●A crystal oscillator is an electronic oscillator circuit that uses the mechanical
resonance of a vibrating crystal of piezoelectric material to create an electrical
signal with a very precise frequency.
●This frequency commonly used to keep track of time (as in quartz wrist watches).
●It provide a stable clock signal for digital integrated circuit and to stabilized
frequency for radio transmitters and receivers.
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11. ● The 78xx is a family of self-contained fixed linear
voltage regulator integrated circuits.
● The 78xx family is commonly used in electronic
circuits requiring a regulated power supply due to
their ease-of-use and low cost.
● For ICs within the family, the xx is replaced with two digits, indicating the output voltage
(for example, the 7805 has a 5 volt output, while the 7812 produces 12 volts).
● The 78xx line is positive voltage regulators: they produce a voltage that is positive relative
to a common ground.
●There is a related line of 79xx devices which are complementary negative voltage
regulators. 78xx and 79xx ICs can be used in combination to provide positive and negative
supply voltages in the same circuit.
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12. RESISTORS CAPACITORS
│
│
│
│
●Resistors resist of electric current for
example (a resister is place in series
with LED to limit the current passing
through it).
● Resistance is measured in Ohm, the
symbol for Ohm is an omega.
● Variable resistors consist of a
resistance track with connection at
both and a wiper which move along
the track as u turn the spindle.
● Capacitors store electric charge.
● These are use with resistor in timing
circuit because it takes time for a
capacitor to fill with charge.
● These are also used in filters
because it easily pass AC and block
DC.
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13. •The circuit is based on LM35 analog temperature sensor and ATMega 328
microcontroller.
• For example, if the temperature is 38°C, the output voltage will be 38 x 10mV =
380mV.
• ATMega 328 has an inbuilt ADC that is used to is used to convert the analog
output voltage of the LM35 to a proportional 10 bit digital value suitable for the
microcontroller.
• The microcontroller accepts the output of ADC, performs necessary
manipulations on it and displays it numerically on an LCD display.
•Output of the LM35 is connected to the analog input pin (pin 23) of the
microcontroller.
• Data lines are Pins 4, 5, 6, 11, 17 and 18 of the microcontroller which are the
digital inputs D2, D3, D4, D5, D11 and D12 respectively.
12

14. •The reset switch is connected to pin 1 of the microcontroller through a 10k resistor.
• A crystal oscillator is connected between pins 9 and 10 of the microcontroller through
two 22picoFarad capacitors.
• These Pins are interfaced with the LCD as- LCD RS pin to digital pin 12, LCD Enable pin to
digital pin 11, LCD D4 pin to digital pin 5, LCD D5 pin to digital pin 4, LCD D6 pin to digital
pin 3, LCD D7 pin to digital pin 2, LCD R/W pin to ground and 10K resistor: ends to +5V and
ground, wiper to LCD Vo pin (pin 3) for contrast adjustment of the LCD.
13

15. APPLICATION
• Used in coal mine, bio gas manufacturing centers.
•Used in power plant generation.
• Agriculture field monitoring.
•Industrial purpose
• Temperature Monitoring and Logging System suitable for use in
Hospitals.
•Temperature monitoring can be used in home or various halls like
conference room, seminar hall to control the temperature of room.
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16. •The system has various advantages over other similar systems such as
cost-effectiveness, smaller size, ondevice display, less complexity and
greater portability.
•This project can be used in industries to measure the temperature and
control the temperature as per requirement.
•It can be used in tea factories to continuously monitor and control the
temperature required for processing the tea leaves.
•The system can be used in green houses to control the temperature for
the proper growth of plants.
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17. DISADVANTAGE
• it need network.
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18. FUTURE SCOPE
•Adding of more sensors to monitor other environmental parameters
such as Soil PH Sensor, CO2 and oxygen Sensor while allowing the
replacing of current sensors if a wider range of measurements is
desired.
• also Integration of additional monitoring devices such as a Wi-Fi
camera to monitor growth of agricultural product.
• data can be uploaded to web server continuously.
17

19. •Temperature monitoring and controlling is done with the help of a
microcontroller and LM35DZ is the temperature sensor.
•The temperature is displayed on the LCD screen and the desired
value of temperature is also set.
•by applying more sensors like light intensity sensor, barometer,
humidity sensor etc, more parameters like light, atmospheric
pressure and humidity etc can be monitored and controlled.
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20. REFERENCES
•baruah.jislam.bzaman%20(2)
•Picinf.blogpost.in
• Data sheets, LM35 Precision Centigrade Temperature Sensors,
Texas Instruments, Aug. 1999-Revised Jul. 2013.
• Datasheets, ATmega328P, 8-bit AVR Microcontroller with 32k
Bytes In system programmable flash, Atmel.
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