This document describes a microcontroller-based infrared (IR) remote control signal decoder designed for home automation applications. It decodes signals from an IR remote to control a fan regulator and power supply switch remotely up to 10 meters away. The device consists of an IR transmitter, IR receiver, microcontroller decoder, and driver circuits. The IR signals are converted to electrical pulses which the microcontroller decodes to control the fan speed or switch power on/off.

1. Microcontroller Based IR
Remote Control Signal Decoder
for Home Application
JAHIR HUSSAIN.M-
1611110027
1st YEAR MTECH -PED

2. ABSTRACT
 Design and implementation of an infrared
(IR) remote control signal decoder used to
various home control applications.
 Designed remote controlled fan regulator
and ON-OFF power supply switch.
 Enables the user to control a fan
regulator and operate the mains
power switch from about 10 meters
away.

3. DEVICE HARDWARE DESIGN

4.  The device consist of blocks namely
IR transmitter, IR
receiver, microcontroller as
decoder, driver circuit.
 IR pulses convert into electric pulses
using IR sensor and given to
microcontroller.
 Electric pulses change into data byte
using zero crossing detector and on
chip timer and interrupt.
 Data bytes are used to take control
decisions.

5. Pin Configurations

6. IR remote transmitter

8. Zero crossing detector
 Zero crossing detector generates
pulses for every zero crossing of the
input AC signal.
 Pulses are fed to the microcontroller
interrupt pin through the opto-coupler.
 The opto-coupler is used for the
isolation of the high voltage AC to the
low voltage DC supply at the
microcontroller side.
 Microcontroller was interrupted for
every zero crossing which triggers the

9. Interfacing diagram

10. Microcontroller unit as
decoder
 Microcontroller’s on-chip peripherals
like programmable I/O port, Timer and
External Rest, RC-oscillator, EEPROM,
Power On Reset (POR).
 TSOP-1740 receiver module is used to
receive the IR signal form transmitter
 Present system to increase or decries
output AC voltage the function keys
used are ‘Volume +’ and ‘Volume -’ on
IR remote transmitter and to ON-OFF
AC mains switch ‘Power’ function key

11. Load Driver
 Power control device used triac BT136
being least expensive power switch to
operate directly on the 110/240V mains.
 It withstand a maximum load current 5A.
 output power is controlled by the phase
delay of the TRIAC drive.
 delay is referred to the zero crossing of
the
Line voltage detected by Zero crossing
detector circuit.
 The control output from microcontroller
port pin is given to opto-coupler
MOC3031M to trigger the triac.

12. Flow chart

13. The display circuit
 Device provides 10 steep speed
controls from 0 to 9.
 Current speed is displayed on a LCD
module. The LCD module has on-
board display controller.
 The display unit is composed of 16 x 2
lines.
 The LCD is configured in 4-bit mode
with read-write control (WR) pin
grounded.

14. PROGRAM
ORG 0000H
CLR A
HERE JNB P3.0 ; HERE
MOV TMOD, #20H
MOV TH1, #FDH
MOV SCON, #50h
MOV P3, #FFh
MOV A, SBUF
MOV R0, A
CJNE R0, #10h ; HERE1
MOV R0, 255h
GO MOV TMOD, #10h
MOV TL1, #00h
MOV TH1, #DCh
SETB TR1

15. AGAIN JNB TF1, AGAIN
DJNZ R0 , GO
HERE1 CJNE R0, #20h ; HERE2
MOV R0, 255h
GO1 MOV TMOD ,#20h
MOV TL1, #00h
MOV TH1, #EEh
SETB TR1
AGAIN 1 JNB TF1, AGAIN 1
DJNZ R0 , GO1
HERE2 CJNE R0, #30h ;
MOV R0, 255h
GO2 MOV TMOD ,#30h
MOV TL1, #00h
MOV TH1, #F7h
SETB TR1
AGAIN 2 JNB TF1, AGAIN 2
DJNZ R0 , GO2

16. CONCLUSION
 IR remote control signal decoder is
implemented using microcontroller and
its application is successfully
demonstrated for home applications.
 The system is quite cheap, reliable and
easy to operate.

17. THANK YOU