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 4. Switch HT12E Encoder 7408 AND Gat 555 timer BC54 7 Transi stor IR Trans mitter SW1 SW2 SW3 SW4 Serial data Serial 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 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 8. Signal Processing in HT12E ON = SW1 ON = SW1,2 8 bit Address 4 bit DataTE 9. Signal Processing in HT12E ON= SW1,2,3 ON= SW1,2,3,4 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 12. Signal Processing in AND Gate ON = SW1 ON = SW1,2 SignalCarrier 13. Signal Processing in AND Gate ON= SW1,2,3 ON= SW1,2,3,4 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 15. Transmitting Signal in IR LED ON = SW1 ON = SW1,2 16. Transmitting Signal in IR LED ON= SW1,2,3 ON= SW1,2,3,4 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 19. Signal Processing in IR Receiver ON= SW1,2,3 ON= SW1,2,3,4 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 25. Complete Circuit Diagram of Transmitter 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 HT12E 1M 1 2 3 10K 2 3 4 5 6 7 8 1.3K 220R 100R IR LED BC547 555 Timer .01uF .01uF +5V GND 7408 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. 27. Complete Circuit Diagram of Receiver BC547 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 +5V +12V LOAD LOAD LOAD LOAD 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 9 NC NO 3 2 1 HT12D ULN2003 Tsop 1738 47R 3.3K 10K 4.7uF 48.2K COM NC NO COM NC NOCOM NC NOCOM 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 29. Complete Signal Processing HT12E AND Gate BC547 IR LED Tsop 1738 BC547 S1S2S3 30. Printed Circuit Board (PCB) Layout Receiver Transmitter 31. HT12E 555 Timer 7408 BC547 IR LEDSwitch 32. Receiver IR ReceiverDecoder Relay Load 33. Complete project 34. THANK YOU FOR YOUR PATIENCE