Shahriar Posted May 4, 2005 Report Share Posted May 4, 2005 HiI want to build a chornometer in an Outdoor place that when someone passes the start line the chornometer begines time measuring. the start Line width is variable between 5-10 meters. Someone told me to do the job with a laser. but the problem is the sensor for the laser. what is the best way to sens a laser with no error. In case of an error the chornometer STARTS.ThanX in advanceShahriar Quote Link to comment Share on other sites More sharing options...
EdwardM Posted May 5, 2005 Report Share Posted May 5, 2005 Hi Shahriarone way to do what you need is to have two or more beams separated by some distance so that, for example, a bird flying through one beam wont trigger the other(s).Some other non-laser ways to achieve the same thing: It just depends how much technology you want to include...Pressure pad which must be stepped on (or stepped off) to initiate timing.Sound level switch, if a loud noise initiates start.Someone looking at start line, press chronometer start button.etcBest of LuckEd Quote Link to comment Share on other sites More sharing options...
MP Posted May 6, 2005 Report Share Posted May 6, 2005 Shahriar, What usually causes false triggers in a laser sensing circuit is the outside light such as reflections from other sources, etc. This, of course, is dependent upon what you are using for a sensor. By recessing the sensor in a tube and insuring perfect alignment of the laser, you will have more success.MP Quote Link to comment Share on other sites More sharing options...
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