i intend to make a lap counter using ir as the triggering mechanism. but i also like to have several different ir transmitters all running at the same time up to 8 but probably only 2 or 3 will only ever be used and the same time. id like to run with several check points 4 to be exact. im thinking of running nanos in the 4 checkpoints and something a little meatier like a due to handle time keeping & lap counting plus any thing else i might want to add down the line. i want to using bt to link all to relay checkpoint trigers, 5 devices will be together tide but im kinda worried about range. it will be set up in a room about the size of a gym with direct line of sight it will be used to count rc car laps and times. so 2 or more cars many trigger the at once sencer and id like it to know that there were multipul car detected and witch ones i know i can u a 555time to get different pulse out of the to of the ir so it know the difference in cars but when 2 cars r detected at once i get the hiccup as how to do this. with this sad what is truely feasible and what is a pipe dream. or a better way to set up shop or to design said project. thanks. im also wearied that this things wount be able to about trigger the sencer as they will only be in view for 1/2 sec at most.
sorry about my spelling and grammer i know its bad any ad vice would be help full, thanks