1. Department Of Electrical & Electronic Engineering
International Islamic University Chittagong
Dhaka 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
2. 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
3. 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
5. 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
6. 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.
7. 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
10. 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
11. 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
14. 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
17. 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
Pass
PIN
diode
2
3
1
Vs.
OUT
GND
$01R
Block diagram of Tsop1738
18. ON = SW1
ON = SW1,2
Signal Processing in IR Receiver
20. 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
21. 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
22. 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
23. 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
24. 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
26. 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.
28. 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
