MICROCONTROLLER BASED IR FOR HOME APPLICATION

MICROCONTROLLER BASED IR FOR HOME APPLICATION

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  Microcontroller Based IR RemoteControl Signal Decoder for Home Application JAHIR HUSSAIN.M- 1611110027 1st YEAR MTECH -PED
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  ABSTRACT  Design andimplementation 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.
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  DEVICE HARDWARE DESIGN
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   The deviceconsist 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.
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  Pin Configurations
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  IR remote transmitter
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  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
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  Interfacing diagram
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  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
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  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.
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  Flow chart
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  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.
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  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
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  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
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  CONCLUSION  IR remotecontrol 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.
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  THANK YOU