I have a room with lots of individually addressable LEDs on the walls. I want each LED to only light up, when a moving object is near them. (By near them I mean in terms of x/y coordinates. The z-axis (height of the room) should be ignored.The room is about 5x7m. And 10cm² of accuracy would be nice.A few ideas that came to my mind:- GPShow: using some GPS modulesproblem: requires every object to carry the modules and GPS will likely not work indoors- wifi/gsm triangulationhow: maybe using 3 ESP8266 modules in sniffing modeproblem: requires every moving object to carry a sort of smartphone with them- laser barrier grid arrayhow: some ir lasers, some photo sensorsproblem: requires a lot of sensors to get precise coordinates => looks weird and ugly- distance measuring grid arrayhow: ir or ultrasonic distance measurement sensorsproblem: requires a lot of sensors to get precise coordinates => very expensive and looks uglymost ir distance sensors only work up to 80cm; most ultrasonic sensors only work up to 450cm and have a 15° detection cone.- 2 axis motorized distance measurement how: a wall mounted construct that allows a distance measuring sensor to be moved via one or two motorsproblem: complicated algorithm required, building the motorized 2 axis arm will be very complicated, too.- real time camera output analysishow: using 2 cheap uart/spi camera modules mounted on different non opposing walls and a very sophisticated algorithm. and maybe some ir lights to detect movement in the darkproblem: the algorithm would be extremely complicated. it also probably wouldn't cover the whole room and wide angle lenses would complicate the algorithm even more.- a hybrid out of the last two mentioned ones with only one camerahow: one camera just checks for changes in pixels and the distance measurement sensor automatically gets directed onto that pixels position. So basically the camera will do the x-axis and the distance measurement sensor the y-axis.problem: the algorithm might be more simple than the one of the cameras-only idea, but it would still be extremely complicated to build the thing.I just can't come up with a satisfying solution. Any ideas?
How about Lidar?
In a known rectangular room, just need the shortest distance from 2 perpendicular walls to determine location.
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