var etat=0
var a[2]=[0,0]
var NoirOuBlanc = 0
timer.period[0] = 0
call sound.system(-1)
call leds.top(0,0,0)
call leds.bottom.left(0,0,0)
call leds.bottom.right(0,0,0)
call leds.circle(0,0,0,0,0,0,0,0)

onevent buttons
	if button.center == 1 then
		motor.left.target = 0
		motor.right.target = 0
	end
	if button.forward == 1 then
		motor.left.target = 50
		motor.right.target = 50
	end
	if button.forward == 1 then
		timer.period[0] = 14300
	end
onevent prox
	if   prox.ground.reflected[0]>= 800
	and  prox.ground.reflected[1] >= 800 then
		NoirOuBlanc = 1
	elseif prox.ground.reflected[0] <= 200
	and    prox.ground.reflected[1] <= 200 then
		NoirOuBlanc = 0
	end

onevent timer0
	timer.period[0] = 0
	motor.left.target = 0
	motor.right.target = 0