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 [DPRG] Current Sensing -- How to Do It? Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] Previous message: [DPRG] Current Sensing -- How to Do It? Next message: [DPRG] Current Sensing -- How to Do It? Subject: [DPRG] Current Sensing -- How to Do It? From: Chuck McManis chuck.mcmanis at gmail.com Date: Mon Jul 19 16:48:14 CDT 2010 ```Everyone has missed the obvious of course. Use a Wii controller. Put an infra-red LED on the car, point the wii controller camera at the track, wii controller will tell you where the car is in 3-D at something like 100 times/second over bluetooth. You can define the projection plane by putting the LED at various known points on the track and then some simple algebra will give you a real-time car position feedback. --Chuck On Mon, Jul 19, 2010 at 9:29 AM, Dick Swan wrote: > Steve: > > The point of dividing the track into segments is to know where the slot > car is on the track. And then to adjust the speed based on which segment > is “active”; so that you can have higher speeds on the straight-aways vs > on the curves. > > I recall one self-learning algorithm that works as follows: > > 1. Start the car at a low speed on the track. Measure the time to > travel on each segment. This establishes a baseline. > > 2. Repeat the following > > 3. Gradually increase the speed through one of the track segments. > See if the time to travel the segment increases or decreases. > > 4. A increasing time through the segment indicates that the motor is > going too fast and slipping on the track indicating that the car is nearly ready > to spin out. At least this is the theory. So you’ve reached the speed > limit for that particular segment. > > 5. Repeat for all track segments. > > If (4) above proves to be false, then simply increase the speed until the > car actually spins out. You have to manually reposition the car on the > track. The software is waiting for this and has remembered the test progress > up to the time it spun out. Software will resume maximum speed detection > now that it knows the “spin out” speed for that particular segment. > > I’m expecting that it will be possible to create computer controlled > speeds that will be almost impossible to match with human control. > > _______________________________________________ > DPRGlist mailing list > DPRGlist at dprg.org > http://list.dprg.org/mailman/listinfo/dprglist > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://list.dprg.org/pipermail/dprglist/attachments/20100719/55c45485/attachment.html ``` Previous message: [DPRG] Current Sensing -- How to Do It? Next message: [DPRG] Current Sensing -- How to Do It? Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the DPRG mailing list