I'd like to build a motion scanning device that detects moving bodies within a twenty meter radius, emitting a sound when it picks up activity. Much like the scanner in the alien movies. I know it is a cheesy project, but I'm new to electronics and would like to improve by taking on a project like this. I haven't found any plans online, so would anyone be able to provide me with some plans or instructions? I would really appreciate any help, as the only plans I found were for a replica of a scanner from the alien movies. Though I do not want to make a replica, just something similar.
I would appreciate any advice or help, thanks
I would appreciate any advice or help, thanks