VERY USEFULL NEXT GEN

1. Presented By:
K.SHASHIDHAR (11UE1A0482)
N.SANDYA RANI (11UE1A0476)
CH.SAMPATH (11UE1A0472)
B.THARUN REDDY (11UE1A04A0)
TRINITY COLLEGE OF ENGINEERING AND TECHNOLOGY
KARIMNAGAR
DTMF BASED APPLIANCES
CONTROL SYSTEM FOR
RURAL AND AGRICULTURAL
APPLICATIONS

2. To design a project “DTMF BASED APPLIANCES CONTROL
SYSTEM FOR RURAL AND AGRICULTURAL APPLICATIONS” to
control Electrical devices using mobile phone.
AIM OF THE PROJECT

3. As technology advanced man was able to control everything
from one place.
Now-a-Days Automation is playing an important role in each
and Every field such as Industrial, Home, Rural and
Agricultural Areas.
Usually we used to control the industrial equipments by
manual operation, which increases the human effort and
maintenance cost.
In order to overcome this problem, the system is designed to
control devices at remote place.
To control the devices from remote place we are using a
DTMF(Dual Tone Multi Frequency) technique.
INTRODUCTION

4. HARDWARE:
 ATMEGA8 Microcontroller
 Regulated Power Supply
 DTMF Decoder Board
 Voltage Regulator
 DC Motor
 Bulb
 Mobile Phone
 Relay
SOFTWARE:
 AVR Studio5
 Proteus7.7
 PROGISP
REQUIREMENTS

5. Power
Supply
Mobile
Keypad
ATMEGA8
Relay Unit
Bulb
Dc
motor
Controlling
Mobile
DTMF
Decoder
BLOCK DIAGRAM

6. When we press keys in our cell Phone when call is in
progress, the other person will hear some tones with respect to
keys pressed. These tones are based on the DTMF technology.
And Just connect your cell phone headset (headphone) jack
to the mobile phone.
The tones produced by the mobile keypad which have some
frequency.
DTMF Decoder converts the desired frequency into analog
signals and gives to ATMEGA8 microcontroller.
The microcontroller is used for switching the load
equipment according to the frequency received by the DTMF
receiver by using a combination of Relays.
WORKING

7. The input to the circuit is applied from the
regulated power supply, i.e. 240V A.C. is converted into
12V pure D.C. And given to the circuit.
components of power supply
Power Supply

8. The purpose of DTMF decoding is to detect
sinusoidal signals in the presence of noise and the
DTMF decoder IC interfaces with a microcontroller.
DTMF Decoder consists of MT8870 IC, it detects
the number or code represented by DTMF jack,
through the inspection of the two transmitted
frequencies.
DTMF Decoder

9. The relay takes advantage of the fact that when
electricity flows through a coil, it becomes an electromagnet.
The electromagnetic coil attracts a steel plate, which is
attached to a switch. So the switch's motion (ON and OFF) is
controlled by the current flowing to the coil, or not,
respectively.
Relay:

10. A microcontroller is a
single chip that contains the
processor (the CPU), non-
volatile memory for the
program (ROM or flash),
volatile memory for input and
output (RAM), a clock and an
I/O control unit.
Microcontroller is also
called as “computer on a chip”.
ATMEGA8 Microcontroller:

11. Pin diagram of
ATMEGA8:

12. ATMEGA8 Microcontroller consists of 32 general
purpose working registers. All the 32 registers are directly
connected to the Arithmetic Logic Unit (ALU), allowing two
independent registers to be accessed in one single
instruction executed in one clock cycle.
DESCRIPTION:

13. High-performance, Low-power consumption.
Advanced RISC Architecture.
130 Powerful Instructions – Most Single-clock Cycle Execution.
32 × 8 General Purpose Working Registers.
Programming Lock for Software Security.
Internal Calibrated RC Oscillator.
External and Internal Interrupt Sources.
RISC Architecture.
Key features of ATMEGA8:

14. DTMF (Dual tone multi
frequency) as the name suggests
uses a combination of two sine
wave tones to represent a key.
These tones are called row and
column frequencies as they
correspond to the layout of a
telephone keypad.
DTMF MODULE:

15. This system can be used in industrial applications.
This system can be employed in houses, where people often forget
to switch off electrical appliances.
This system can be used to control AC’s to set the room
temperature when we are outside.
We can extend this circuit to control many electrical devices with
some modifications.
APPLICATIONS

16. Quick response is achieved.
Construction is easy.
Easy to maintain and repair.
Comparatively the operation cost is less.
Design is efficient and low cost.
Power consumption is low.
We can Control electrical devices wirelessly.
It Saves electricity (when we forget to switch off and go out).
We can control appliances from any place round the globe.
ADVANTAGES

17. This system is not capable of displaying the feedback status of
the devices being operated.
This system needs a cell phone to be placed in circuit.
Anyone who knows the phone number and code can control our
electrical appliances.
Number of electrical appliances that can be controlled by this
circuit is limited.
DISADVANTAGES

18. This project can be further enhanced to be high voltage
ac applications by changing the rating of the Relay
We can control and monitor the high speed induction
motors as well as synchronous motors. This can be done in
an economical way.
In this project in future we can add a multimedia camera
to see what is going inside the home by sitting in office or
somewhere.
FUTURE SCOPE

19. THANK YOU