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TSOP1738 IR Receiver continuous detection using microcontroller

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muthumani

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My project is to detect continuous IR signal, once the IR path was blocked for more than 200ms it should sound a buzzer. So created a IR transmitter with 38Khz using 555 at one end. TSOP1738 connected to PIC micro controller at the receiver end. My observation is once the IR path was blocked means TSOP1738 became active low for approximately 100ms and goes high. My requirement is it should be low until IR path was blocked. Please suggest me an idea...
 

i think this would help you, but this code is for 8051. i left only the delay part

Code: 
IR   equ P3.3
buzz equ P1.0	        
	
	org 00H
	mov P1,#00h
	
main:						
	jb IR,lop
lop:
   jnb IR,delay
   sjmp main
delay:



ret
end
 

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