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how to build a sensor/receiver that revives green and red light? Answered

hi guys
i hope you can help me out. i am competing in a roborace (www.roborace.co.za)
we need a sensor that picks up a green light so that the car can start moving forward,
then we also need a sensor that picks up red light in order to stop the car.

i know you can use a normal LED and connect it the wrong why around apparently  it can pick up the same  color as what the LED is emitting
example: Green Led will pick up green light.

can someone please help me out

Kind regards


Put a filter* over your sensor. Green filter - green light.


*thin, coloured plastic.

thanks ill try figuring it out. thanks for the info