Target or Flag for IR-shooting toys like the "Combat Twister" helicopter from Nine Eagles.
Unless you're playing in a complete dark room you will need an IR-filter in front of the camera. A simple solution is to add a piece of processed but unexposed film (the black part at beginning and end of a roll). Just tape it with a transparent tape in front of the camera. See screenshots for details.
Avoid aiming at windows during game and while calibrating, the sun is pretty disturbing.
This version of IR Target Android App comes with one universal variant which will work on all the Android devices.
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