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July 2006, Issue 192

Precision Motion-Sensing System Analyzer
Philips ARM Design Contest 2005 Winner


by Steve Lubbers


Start Intro to Bull Riding Data Collection PC Interface Controls Data Upload External Trigger CPU User & Serial Interfaces Accelerometers Wireless Access Bucking Dummy Interface Software Acceleration Capture Foul System Test Data Analysis Findings The Buckymeter's Future Sources and PDF

FOUL

As I explained earlier, a bull fouls by bumping the gate, falling down, or stumbling. When I tested the system, I noted several fouls that would have granted a rider a reride.

If a bull bumps a gate, for instance, you’ll see a huge spike in the datastream on one or more of the accelerometers. The difference between adjacent samples is continuously monitored on each of the four channels. A foul is signaled if any sample-to-sample delta exceeds a calibrated threshold.

Foul detection software, which runs in the fast loop, scans for fouls. If a foul is detected, the optically isolated output can be triggered to notify the judges.