Hello, dear Rongzhong Li ! All kittens love to play with a laser dot very much. It will be a lot of fun if your Nybble can do this. I made a robot on an Arduino NANO with an OV7670 camera that can do this. OV7670 - VGA mode 640 x 480 / / 15 frames / sec the prototype ( made from a toy) I sent you a more detailed email on 08.09.21 at info@petoi If you are interested, write to me by email lahu2020@mail.ru I'm sure we can come to an agreement. With respect.