Check this out... Someone (Russell, probably :O) posted this a while back: http://tinyurl.com/cdm7 A good example of impact tracking on a target. - Robert ----- Original Message ----- From: "Alan B. Pearce" To: Sent: Friday, October 03, 2003 9:49 AM Subject: Re: [PICLIST] [EE]: sensing on a target > >So to contiue on.....I think the resolution can be as large as 4" square. > > I would be tempted to have a single sensor that detected the object hitting > the target, and then use a pair of simple CCD cameras, one at each top > corner faced to the diagonal opposite bottom corner of the target, and > compute X-Y coordinates from these. This way the sensor could be mounted > almost anywhere on the target, and an acceleration sensor such as an ADXL202 > suggests itself as a suitable means of detecting the strike. > > When the object hits a signal is sent to each camera to capture the frame > for processing. Normal web cams would probably be too slow for this, as I > doubt you would be able to get the trigger signal through a PC and out to > the camera fast enough to make it capture at the critical time, but if you > had a means of making the camera capture a single image from an external > signal, then your download speed does not need to be fast. Then some image > processing of the two images provides the point of impact. > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu