remote controlling of home appliance
TRANSCRIPT
Department Of Electrical & Electronic Engineering
International Islamic University ChittagongDhaka Campus
Presented By
Md. Reyaz Uddin (ET093509)
Md.Moniruzzaman (ET 093512)
Md. Tarik Rahman sarker (ET093521)
Supervised by
Md. Ismail Hossain
Assistant Professor, Department of EEE
IIUC, Dhaka Campus
Name of our Project
Remote Controlling of Home Appliance
Objective of The Project
Block Diagram of The Project
Explanation of Basic Equipment
Complete Circuit Diagram
Printed Circuit Board (PCB) Layout
Photo and Video of the project
Contains
The main objective of this project is to help for elderly
people as well as for those who are unable to walk either
due to physical disabilities or due to accidents.
Objective of the project
SwitchHT12E
Encoder
7408
AND Gat
555 timer
BC54
7
Transi
stor
IR
Trans
mitter
SW1
SW2
SW3
SW4
Serial
dataSerial
Data
Serial
Data
Warles
s
Mediu
m
IR
Recei
ver
BC547
Transi
stor
HT12D
Decoder
ULN
2003RelayLoad Serial
Data
Serial
Data
DA1
DA2
DA3
DA4
DA
1
DA
2
DA3
DA4
SW1
SW2
SW3
SW4
Transmitter side:
Encoder (HT12E)
555 Timer
AND Gate (7408)
IR Transmitter (IR LED)
Receiver side:
IR Receiver (Tsop 1738)
Decoder (HT12D)
Relay Driver (ULN 2003)
Relay
Converts the parallel inputs into serial output
It encodes the 12 bit parallel data into serial for transmission
The 212 encoders are a series of CMOS LSIs for remote control
system applications.
Each address/data input can be set to one of the two logic
states.
Pin
No
Function Name
1
8 bit Address pins for input
A0
2 A1
3 A2
4 A3
5 A4
6 A5
7 A6
8 A7
9 Ground (0V) Ground
10
4 bit Data/Address pins for input
AD0
11 AD1
12 AD2
13 AD3
14 Transmission enable; active low TE
15 Oscillator input Osc2
16 Oscillator output Osc1
17 Serial data output Output
18 Supply voltage; 5V (2.4V-12V) Vcc
Signal Processing in HT12E
ON = SW1
ON = SW1,2
8 bit Address 4 bit DataTE
Signal Processing in HT12E
ON= SW1,2,3
ON= SW1,2,3,4
The 555 timer is an integrated circuit which used to
provide time delays, pulse generation, and oscillator
applications
At Astable Multivibrator mode the 555 timer produces
continuous square wave
Basic digital logic gate
Two or more inputs and a single output
This gate works or operates on logical multiplication rules
(Y= A.B)
Truth Table
INPUT OUTPUT
A B A.B
0 0 0
0 1 0
1 0 0
1 1 1
Signal Processing in AND Gate
ON = SW1
ON = SW1,2
SignalCarrier
Signal Processing in AND Gate
ON= SW1,2,3
ON= SW1,2,3,4
Transmits infrared rays in the range of 700 nm to 1 mm
wavelength
Carrier Frequency must be equal to demodulator carrier
Frequency for maximum transmission
Made of gallium arsenide or aluminium gallium arsenide
Work well in remote control systems
1.5VDC forward voltage and 50mA max forward current
Transmitting Signal in IR LED
ON = SW1
ON = SW1,2
Transmitting Signal in IR LED
ON= SW1,2,3
ON= SW1,2,3,4
Consists of a PIN diode and a pre amplifier
This input signal is received by an automatic gain control
The signal is passed to a band pass filter to filter undesired frequencies
Output pin 3 remains high Till it receives signal
Output goes low when receives signal
Input
AGC
Control
Circuit
Demo
dulator
Band
PassPIN
diode
2
3
1
Vs.
OUT
GND
$01R
Block diagram of Tsop1738
ON = SW1
ON = SW1,2
Signal Processing in IR Receiver
Signal Processing in IR Receiver
ON= SW1,2,3
ON= SW1,2,3,4
Converts the serial input into parallel outputs
Decodes the serial addresses and data
It has 8 address lines and 4 data lines same as encoder
(HT12E)
Capable of decoding 12 bits
Output pins remain unchanged until new is received
Pin
No
Function Name
1
8 bit Address pins for input
A0
2 A1
3 A2
4 A3
5 A4
6 A5
7 A6
8 A7
9 Ground (0V) Ground
10
4 bit Data/Address pins for output
D0
11 D1
12 D2
13 D3
14 Serial data input Input
15 Oscillator output Osc2
16 Oscillator input Osc1
17 Valid transmission; active high VT
18 Supply voltage; 5V (2.4V-12V) Vcc
ULN2003 is a high voltage and high current Darlington array IC
These ICs are used when driving a wide range of loads and are used as relay drivers
Pin No Function Name
1 Input for 1st channel Input 1
2 Input for 2nd channel Input 2
3 Input for 3rd channel Input 3
4 Input for 4th channel Input 4
5 Input for 5th channel Input 5
6 Input for 6th channel Input 6
7 Input for 7th channel Input 7
8 Ground (0V) Ground
9 Common freewheeling
diodes
Common
10 Output for 7th channel Output 7
11 Output for 6th channel Output 6
12 Output for 5th channel Output 5
13 Output for 4th channel Output 4
14 Output for 3rd channel Output 3
15 Output for 2nd channel Output 2
16 Output for 1st channel Output 1
Relay is an electromagnetic device
It used to interface an electronic circuit which works at
very high voltage
Current flowing through the coil of the relay creates a
magnetic field which attracts a lever and changes the
switch contacts
Complete Circuit Diagram of Transmitter
1
2
3
45
6
7
8
9 1011
12
13
14
15
16
17
18
1
HT12E
1M
1
23
10K2
3
4 56
7
8
1.3K
220R
100R
IR LED
BC547
555 Timer
.01uF .01uF
+5V
GND
7408
At first you have to set Data, then press TE pin which is
grounded by a switch.
Now we know when TE pin is low the address and data are
transmitted serially through output pin
After that 8bit address and 4bit date are transmit with
38KHz carrier signal Through IR LED.
Complete Circuit Diagram of Receiver
BC547
1
2
3
45
6
7
89 10
11
12
13
14
15
16
17
18
+5V
+12V
LOAD
LOAD
LOAD
LOAD
1
2
3
4
5
6
78
10
11
12
13
14
15
16
9
NC
NO
321
HT12D
ULN2003
Tsop 1738
47R
3.3K
10K
4.7uF
48.2K
COM
NC
NO
COM
NC
NOCOM
NC
NOCOM
If we set the Data as 1011 (sw2 on) Then corresponding Lamp will
be ON
Data receiver will demodulate the carrier and gives this address &
data to IC HT12D
Decoder decode the data and sent data to relay driver
Relay driver control relay According decoder data
Complete Signal Processing
HT12E
AND Gate
BC547 IR LED
Tsop 1738
BC547
S1 S2 S3
Printed Circuit Board (PCB) Layout
Receiver
Transmitter
HT12E
555
Timer 7408 BC547 IR LEDSwitch
ReceiverIR ReceiverDecoder
Relay
Load
Complete project
THANK YOU
FOR YOUR PATIENCE