private fun enable_proximity
	do
		proximity.asensor = sensormanager.get_default_sensor(new ASensorType.proximity)
		if proximity.asensor.address_is_null then
				print "Proximity sensor unavailable"
		else
			if eventqueue.enable_sensor(proximity.asensor) < 0 then print "Proximity enabling failed"
			eventqueue.set_event_rate(light.asensor, light.event_rate)
		end
	end