I’m looking to make something. Here are the requirements.
Much like a laser beam (or something that gives straight line of sight) from one end to the other.
That only detects and triggers when someone that has a tag, or some device on their person. Everyone else would be fine except those that have this tag or device.
When the device triggers after passing the beam (or whatever), there is a speaker on the device where it has a pre-recorded message (my voice)
Can someone list the part names (at a high level) I might be interested in looking at?