I will have IR led and IR sensor as in TV. As you know, even if you don't point at the TV you are able to change channels.

My question is, is it possible to limit it somehow (maybe by putting the LED into some hollow cylinder)?

  • \$\begingroup\$ Add a lens to the front to focus the beam - just like when you burn ants with a magnifying glass. \$\endgroup\$
    – Majenko
    Commented Oct 18, 2014 at 13:01

1 Answer 1


I repair guns for a system called "Battle Sports". That employs an infra-red emitter combined with a couple of white LEDs in the gun:

enter image description here

That module is placed at one end of a plastic tube, about 6 inches long. At the other end of the tube is a lens. The lens is specifically shaped, and placed, so that the light from the module is focused into a roughly parallel beam. That translates to the white light forming a spot a couple of inches across (used to aim with), and the IR light covering roughly the same area.

The IR is modulated at 56KHz, with a pulsed on/off signal to identify that it's a proper gun that's in use.

The gun also has an IR receiver module on it, as well as a pair of receivers that the user wears on a headband. These are a simple amplifier / filter arrangement that just returns the pulses without the 56KHz modulation. They are domed, with a full 360° / 180° range on them, so they can be shot from any angle.

  • \$\begingroup\$ Can we talk about that? zatokar1 (skype) I will pay, thank you. \$\endgroup\$ Commented Oct 18, 2014 at 13:58
  • \$\begingroup\$ And also I have a question, what are those white leds for? By the way, great answer, but I didnt get those white leds. Sorry. \$\endgroup\$ Commented Oct 18, 2014 at 14:23
  • \$\begingroup\$ Probably for Aiming right? :D \$\endgroup\$ Commented Oct 18, 2014 at 14:26
  • \$\begingroup\$ Fun! What range do you get? Can you play outside or inside only? (gotta link?) \$\endgroup\$ Commented Oct 18, 2014 at 15:32
  • \$\begingroup\$ They're for outdoors, running around in the woods. \$\endgroup\$
    – Majenko
    Commented Oct 18, 2014 at 15:32

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.