#Detecte table border 
    if prox.ground.reflected[0] < 130 or prox.ground.reflected[1] < 130 then 
        motor.left.target=0
        motor.right.target=0
        call leds.bottom.left(32,0,0)
        call leds.bottom.right(32,0,0)
    else
        call leds.bottom.left(0,0,0)
        call leds.bottom.right(0,0,0)
    end