[EricH]

Originally Posted by yongkimleng

Okay basis of a flame emits lots of IR

So using "line tracer" which are actually IRs, make a nice tube around the IR window to block out ambient light. Maybe want to tweak/mod it to disable the IR emitter.

Similar to the above post on putting a tube around light sensor but I think IR may be better suited

cheers

He can't use anything outside a VEX starter kit. (Other than the light sensors and some extra VEX sensors.)

However, there are some black rubber spacer-type things (axle blocks and the like) that might work, if bolted together...