Changing the range with a IR emitter

[anfedres]

Hey guys, I'm new here, and I'd like to ask you if anybody knows how to change the distance of detection with a IR Emitter, actually, I'd like to decrease it, I know that I have to place some resistors, so, If I change the voltage or the value of the resistor, this will have consequences in the distance detection, right, I'd like to know just an example or a quick schematic to see it. Thanks guys.

 

[Sceadwian]

anfedres.... Just put increasing numbers of very thin paper in front of the emitter (think thin tracing paper)

Sometimes answers are easier than they appear.

 

[duffy]

If the tracing paper isn't acceptable, look for a series resistor on the IR emitter and increase the value a good 10 times or so. Like if it's 4.7Ω, make it 47Ω.