Circuit Diagram of Mobile Controlled Home Appliances

Circuit diagram of mobile controlled home appliances

Components required for home automation
1. Regulated power supply
2. DTMF decoder IC (M-8870)
3. Resistors (100Ω; 100kΩ; 70kΩ; 390kΩ)
4. Capacitors (0.1µFx 2)
5. Crystal oscillator (3.579545MHz)
6. IC 7474 D flip flop
7. BC547 Transistor
8. 6V relay
9. DTMF BASED HOME APPLIANCES CONTROL

INTRODUCTION:

Today’s the demand for better home security systems has drifted over to a need for home
automation. Not only does a home need to be secure but home appliances need a more refined
control system. Home appliances should not be limited to only local control. There needs to be
a simple and elegant way to avoid this type of situation and allow people the freedom of
having complete control of their house from anywhere. With this fact in mind we have build a
project for the home automation controls. The key to this control system will be the use of a
telephone for a two way communication path to the central control unit.
With this system, it is possible to operate domestic electrical devices safety by using public or
mobile phones from any places all over the world.
The basic idea of this project is to take advantage of the vast network of telephone lines and
the proliferation of cell phones to extend human’s reach and possibilities. The system, through
telephone networks, connects the user home appliances at home and gives him/her the ability
to switch them ON or OFF. The user dials the home telephone number like an ordinary
telephone call. The telephone at home rings and if nobody picks the call, then the system picks
up the call. The system then asks for the password. The user enters the password. Once the
password is entered, the user will be offered a voice menu and asked to choose from that
menu. The user chooses an item from the menu by pressing a button on the phone keypad.
Pressing a button on the phone generates a DTMF signal which, through the telephone network,
will reach the system at home. The system will recognize the received signal and based on that
will switch on/off the chosen appliance.
This project uses DTMF technology for the controls.
DTMF, better known as touch-tone, is a system of signal tones used in telecommunications.
Applications include voice mail, help desks, telephone banking, etc.
There are twelve DTMF signals, each of which is made up of two tones from the following
selection: 697 Hz, 770 Hz, 852 Hz, 941 Hz, 1209 Hz, 1336 Hz, 1477 Hz. The tones are divided



AIM & OBJECTIVE

AIM:-
1.To make a CELL-PHONE operated DTMF HOME AUTOMATION SYSTEM.
2.To make a home security system.
3.To prepare remote sensing security system.

OBJECTIVE:-
In the view today society demand it is essential to made a better home security systems. Not
only does a home need to be secure but home appliances need a more refined control system.
Home appliances should not be limited to only local control.
From the above point of view we have tried to prepare a model for home automation control
and security system.











COMPONENTS USED
10.
Component name specification quantity
Microcontroller AT89C51 - 1
Diode IN4007 2
Crystal Oscillator 12 MHz
3.57Mhz
1
1
Capacitor 0.1µF,63V
33pf
3
2
Relay 10 A,120 V,50 Hz 2
Resistors

Pull up
100 KΩ
1KΩ
4.7 KΩ
10 KΩ

2
4
6
1
BC547(npn) - 3
2 pin connector
Female
male
5V
220V
220V
2
2
2
bulb 60W,230V 1
6 pin connector - 1
4 pin switch

1
Buzzer 5V 1
LCD base - 1
LCD 5V 1
IC base 40 pin
20 pin
18 pin
1
1
1
General purpose PCB 14x9 cm 1
11.


12. HOME AUTOMATION MODEL
13.
14. The core of the project is the 8051 microcontroller; it will determine what actions need to
be sent out to the rest of the system. The microcontroller will determine when each sub
part needs to be activated .Other parts include the Phone interface, the decoder and the
appliance connected through the relay.
15.

16.





17. Phone Interface:
18.
The telephone line is hooked to the another phone attached to the system This will
communicate directly with the microcontroller through the CM8870 decoder which decodes all
16 DTMF tone pairs into a four bit code.


19. CM8870/70C (DTMF decoder):
20.
CM8870/70C is a Full DTMF receiver, uses less than 35mW power consumption, uses quartz
crystal or ceramic resonators, has adjustable acquisition and release times, works in Industrial
temperature range and is available in 18-pin DIP, 18-pin DIP EIAJ, 18-pin SOIC, 20-pin
PLCC.
.

Pin Diagram of CM8870C



21. ATMEL AT89C52 (Microcontroller):
22.
he AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K Flash bytes
of Flash programmable and erasable read only memory (PEROM). The device is manufactured
using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-
standard 80C51 and 80C52 instruction set and pinout. The on-chip Flash allows the program
memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer.
By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C52 is a
powerful microcomputer which provides a highly-flexible and cost-effective solution to many
embedded control applications.

Pin Diagram of AT89C52



23. 1N 4007 DIODE:
24.
It has the following features:
1. Low forward voltage drop
2. High surge current capacity
3. Low reverse leakage current
4. V(rrm) = peak repetitive reverse voltage = 1000 V
5. I (fsm) = average rectified forward current = 1A
6. V(f) = forward voltage = 1.1 V

BC 548 TRANSISTOR:
It is general purpose NPN transistor, having the following features:
1. Vcbo = 30 V
2. Ic = 100 mA
3. Ptotal = 50 mW
4. f = 300 MHz


25. LM7805 DC POWER REGULATOR :
26.
It has the following characteristics:
1. Operating current - 1 A
2. Operating voltages - 5 , 6 , 8 , 9 Vetc


27. RF TAG:
28.
It has a 4-bit data input


29. 16 X 2 LCD :
30.

It has 16 characters, 2-line display and is used for general purpose.


31. IC 74LS147 :
32.
It is a 10 to 4 line priority encoder. It encodes 10-line decimal to 4-line BCD.

33. LCD (JHD162A series)
34.
Display Content: 16 Char x 2 Row
Character Dots: 5 x 8
Driving mode: 1/16D

Available Types:
Reflective with EL or Led Backlight
EL/100 V AC 400 Hz
LED/4.2 V DC


LCD pin Diagram:




35. RELAY:

A relay is a type of electrically operated switch which is controlled by an electronic circuit. Within
the relay is a coil of wire which generates a magnetic field when a current flows through it. If
sufficient current at the correct voltage flows through the coil, the generated magnetic field
attracts a metal lever which changes the position of the switch.




The advantage of a relay is that it permits a low voltage DC circuit to control a completely
separate high-power circuit - for example a 240V AC mains electricity powered appliance.


CIRCUIT DIAGRAM:
CODE OBJECTIVE
Make pin P2.5 = 1 when key ‘1’ is pressed and make P2.5=0 when key ‘2’ is pressed.
ORG 0000h
MOV P2, #0FFH //Configure P2 as Input
Main:
JNB P2.0, $ //Wait till a High Pulse is received from StD
MOV A, P2 //Take data in from the output Latch
ANL A, #1EH //Mask the unwanted bits
RRC A
CJNE A, #01H, C1_MAIN //CHECK IF KEY PRESSED IS ‘1’
SETB P2.5 //IF YES P2.5=1
JMP Main
C1_MAIN:
CJNE A, #01H, MAIN //CHECK IF KEY PRESSED IS ‘2’
CLR P2.5 //IF YES P2.5=0
JMP Main
36.
1.

INCLUDE reg_52.pdf
2.


3.

STD EQU P3.0 ;DTMF OUTPUT
4.

Q3 EQU P3.1
5.

Q2 EQU P3.2
6.

Q1 EQU P3.3
7.

Q0 EQU P3.4
8.


9.

RING EQU P3.5
10.


11.

DIS_A EQU P0.0
12.

DIS_B EQU P0.1
13.

DIS_C EQU P0.2
14.

DIS_D EQU P0.3
15.

DIS_E EQU P0.4
16.

DIS_F EQU P0.5
17.

DIS_G EQU P0.6
18.


19.

DSEG ; This is internal data memory
20.

ORG 20H ; Bit adressable memory
21.


22.

DTMF: DS 1
23.

D0 BIT DTMF.0
24.

D1 BIT DTMF.1
25.

D2 BIT DTMF.2
26.

D3 BIT DTMF.3
27.

CSEG ; Code begins here
28.

;---------==========----------==========---------=========-
--------
29.

; PROCESSOR INTERRUPT AND RESET VECTORS
30.

;---------==========----------==========---------=========-
--------
31.

ORG 00H ; Reset
32.

MOV SP,#60H
33.

MOV R2,#15H
34.

CALL DISP ;Display - symbol on display
35.

SETB STD ;Make STD pin as input
36.


37.

TOP: JNB STD,$ ;wait for new data
38.

CALL READ ;Read Data
39.

MOV R2,DTMF
40.

CALL DISP ;Display Dialled Data
41.

JB STD,$ ;Wait until the key is
released
42.

AJMP TOP ;Repeat the function

43.

;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
44.

; READ DTMF TONES
45.

;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
46.

READ:
47.

MOV DTMF,#00H
48.

SETB Q0
49.

SETB Q1
50.

SETB Q2
51.

SETB Q3
52.

JNB Q0,VB1
53.

SETB D0
54.

VB1: JNB Q1,VB2
55.

SETB D1
56.

VB2: JNB Q2,VB3
57.

SETB D2
58.

VB3: JNB Q3,VB4
59.

SETB D3
60.

VB4: RET
61.

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
62.

; 7 SEGMENT DISPLAY ROUTINE
63.

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
64.

DISP:
65.

CJNE R2,#00H,AAS1
66.

CLR DIS_A
67.

CLR DIS_B
68.

CLR DIS_C
69.

CLR DIS_D
70.

CLR DIS_E
71.

CLR DIS_F
72.

SETB DIS_G
73.

RET
74.

AAS1: CJNE R2,#01H,AS2
75.

CLR DIS_B
76.

CLR DIS_C
77.

SETB DIS_A
78.

SETB DIS_D
79.

SETB DIS_E
80.

SETB DIS_F
81.

SETB DIS_G
82.

RET
83.

AS2: CJNE R2,#02H,AS3
84.

CLR DIS_A
85.

CLR DIS_B
86.

CLR DIS_D
87.

CLR DIS_E
88.

CLR DIS_G
89.

SETB DIS_C
90.

SETB DIS_F
91.

RET
92.

AS3: CJNE R2,#03H,AS4
93.

CLR DIS_A
94.

CLR DIS_B
95.

CLR DIS_C
96.

CLR DIS_D
97.

CLR DIS_G
98.

SETB DIS_E
99.

SETB DIS_F
100.

RET
101.

AS4: CJNE R2,#04H,AS5
102.

CLR DIS_B
103.

CLR DIS_C
104.

CLR DIS_F
105.

CLR DIS_G
106.

SETB DIS_A
107.

SETB DIS_D
108.

SETB DIS_E
109.

RET
110.

AS5: CJNE R2,#05H,AS6
111.

CLR DIS_A
112.

CLR DIS_C
113.

CLR DIS_D
114.

CLR DIS_F
115.

CLR DIS_G
116.

SETB DIS_B
117.

SETB DIS_E
118.

RET
119.

AS6: CJNE R2,#06H,AS7
120.

CLR DIS_A
121.

CLR DIS_C
122.

CLR DIS_D
123.

CLR DIS_E
124.

CLR DIS_F
125.

CLR DIS_G
126.

SETB DIS_B
127.

RET
128.

AS7: CJNE R2,#07H,AS8
129.

CLR DIS_A
130.

CLR DIS_B
131.

CLR DIS_C
132.

SETB DIS_D
133.

SETB DIS_E
134.

SETB DIS_F
135.

SETB DIS_G
136.

RET
137.

AS8: CJNE R2,#08H,AS9
138.

CLR DIS_A
139.

CLR DIS_B
140.

CLR DIS_C
141.

CLR DIS_D
142.

CLR DIS_E
143.

CLR DIS_F
144.

CLR DIS_G
145.

RET
146.

AS9: CJNE R2,#09H,AS10
147.

CLR DIS_A
148.

CLR DIS_B
149.

CLR DIS_C
150.

CLR DIS_D
151.

CLR DIS_F
152.

CLR DIS_G
153.

SETB DIS_E
154.

RET
155.

AS10: CJNE R2,#15H,AS11 ;symbol for -
156.

SETB DIS_A
157.

SETB DIS_B
158.

SETB DIS_C
159.

SETB DIS_D
160.

SETB DIS_E
161.

SETB DIS_F
162.

CLR DIS_G
163.

RET
164.

AS11:
165.

CJNE R2,#16H,AS12 ;switch off all disp
166.

SETB DIS_A
167.

SETB DIS_B
168.

SETB DIS_C
169.

SETB DIS_D
170.

SETB DIS_E
171.

SETB DIS_F
172.

SETB DIS_G
173.

RET
174.

AS12:
175.

RET
176.

;**********************************************************

177.

END