want ir LONG RANGE ciruit for reflected type ir sensor

output is average of that

ok then how wil i suppose to detect the signal?
for me its useless then if i dont get a proper low signal how will my microcontroller to get indication that person comes in front of the sensors..?
its seems the "R n D" m doing from long time is not of my use..:(

output is average of that

ok then how wil i suppose to detect the signal?

lucky6772

The low pulses are too short to read with a meter, but not too short for a micro to see.
Connect the output of the TSOP to the INT0 pin.( No pull-ups, LEDs etc.)

Write an interrupt handler that reacts to the pin going low.

can you tell me the time period here mention in datasheet 60ms iis it imp..? becze we havnt set time period 60ms n could u tell me how n what i do its bit confusing..! i almost produce the burst but is continous but here i suppos its mention dat burst wave should also have time period of 60ms..! how could i set dat..?

The data sheet I read just says that the on time should be less than the off time.
I don't know what the 60mS period is for, but I don't think it is important.
Re-check your data sheet, it should explain.

all the things mention in tsop1738 datesheet i have make my code according to dat n u urself seen my code is right..! but only doubt i amd getting is 60ms timeperiod..!check the date sheet i have attached..!

try to keep your burst shorter. A longer burst (continuous 38Khz signal) is considered as disturbance and is suppressed by TSOP. So that may be the reason you are getting IR output going high/low. A burst longer than 1.8ms should be followed by a gap of equal or more than duration of burst.

sir please tell me what change should i made in my code acc to u..! i am not getting dis thing..

#include <REG2051.H>

void delay1(void);
sbit mybit=P1^7;
int c, n;
void delay(unsigned int msec ) // Time delay function
{
int i ,j ;
for(i=0;i<msec;i++)
  for(j=0; j<1275; j++);
}

void timer0_isr () interrupt 1
{
        mybit = ~mybit;
}

void main ()
{
                P1=0x00;
        TMOD = 0X02;
                TL0 = 0xf4;
        TH0 = 0xf4;
        IE = 0x82;
   
     while(1)
      {                                          
           TR0=1;        
           delay(1);
           mybit=0;  //LED off
           TR0=0;                    
           delay(10);                                                                                      
           }

               
       
}

The attached program will work if your hardware is okay.
I'll stake Ajay's reputation on it
It generates bursts of 40 cycles, at 60mS intervals and detects TSOP pulses on INT0.

On the simulation, the button and pull up resistor are for testing only.
Remove them in the real circuit.
Connect your 2n2222 to P.0


Have you tried a new TSOP38 ?

Move the LED from the 2n2222 emitter to the collector side.
Change the base resistance from 5k to 390 ohms.

Follow the diagram on the datasheet that filters the power supply to the TSOP.

Add extra smoothing capacitors near the LED to smooth out the pulses.
If possible drive the LED from a power supply other that the 5 volt supply.
What power supply are you using ?

@ experiment uk: there is something i need to share with the proteus circuit with the code u share and my code have both differenct output..?? did u make some changes in my code..???

ur code output:

my code output

:NOTE THE TIME DIVISION AND VOLTAGE DIVISION NOBE IS SAME IN BOTH THE CASES:

@ experiment uk: there is something i need to share with the proteus circuit with the code u share and my code have both differenct output..?? did u make some changes in my code..???

lucky6772

I included my source code in the zip file.
Have you looked at it ?