Microcontroller › 8051 › to increase the range for the Distance measurement using InfraRed sensor with 8051 by kishoretk22 › Hi thereYou would get optimum
You would get optimum results only when the IR emitter is working under it's proper working conditions, like a proper voltage and current supply. So check out for the specifications of IR LED that you are using, you could get this in its datasheet. Then accordingly, decide the current limiting resistor value. These conditions would ensure that emitter works with recommended parameters and gives the maximium distance range possible.
Hope this helps