want ir LONG RANGE ciruit for reflected type ir sensor

Use different components and a separate power supply

what do you mean by thiis..? shoult i use separate supply for controller n ir..?

Sir, I understand that P1.0 would give me 38KHz. But in the my code, if you observe, you could see that instead of you using the whole port, i am using only 1 pin and making it toggle for every timer overflow. how does it differ from your code. please let me know.

void timer0_isr () interrupt 1
{
ir= ~ir;
a++;
}

and i am using 'a' as a counter to check the no. of cycles.

Use different components and a separate power supply

what do you mean by thiis..? shoult i use separate supply for controller n ir..?

lucky6772

One supply for the transmitter, and another for the receiver.

Sir, I understand that P1.0 would give me 38KHz. But in the my code, if you observe, you could see that instead of you using the whole port, i am using only 1 pin and making it toggle for every timer overflow. how does it differ from your code. please let me know.

lucky6772

I don't know what you are asking here.
I posted some code,
you made changes.....
You must know how your code differs from my original.

Any progress ?

nope still no progress..! i ask someone he said ur signal is getting attenuated may b..! or the transistor is very slow,,as per code swtiching should b fast so make ur circuit fast switching compatible so now. looking for that kinda circuit..to drive my led..!

use FET for faster switching?

can you help me with circuit diagram..using fet to drive ir led..??

Did you look at these websites I gave last time:
http://www.boondog.com/tutorials/lrir/mc145026.htm
http://pcbheaven.com/circuitpages/Long_Range_IR_Beam_Break_Detector/?p=0

this is not helping me i need fast switching circuit to drive led

can you help me with circuit diagram..using fet to drive ir led..??

lucky6772

Try this ...
http://www.talkingelectronics.com/projects/MOSFET/MOSFET.html

Replace the motor with your LED and a limiting resistor.