Algorithm 1 Pseudo code governing the control loop.
	Data: particles, watching_window, detected_movement, not_move_count system initialization;
1	whilenot_move_count < threshold do
2		Detect particles in the current frame;
3		Append detection results to the watching_window;
4		Analyze the direction of particle movement and save result to detected_movement;
5		if |detected_movement| < threshold then
6			STATE <= NOT_MOVE;
7			not_move_count += 1;
8		else if detected_movement > 0 then
9			STATE <= POSITIVE_DEP;
10			function_generator.decrease();
11		else
12			STATE <= NEGATIVE_DEP;
13			function_generator.increase();
14		end
15	end