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Unread 28-01-2013, 18:28
Ken Streeter's Avatar
Ken Streeter Ken Streeter is offline
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FRC #1519 (Mechanical Mayhem)
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Join Date: Feb 2005
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Re: Best way to measure period between pulses? Counters and FPGA

Quote:
Originally Posted by jhersh View Post
This is "method 1" above. This is what he claims not to want.
I had missed that in the original post. However, now I understand why the original poster doesn't want to use "Method 1." Given the statement of seeing RPM values with a resolution of 375 RPM and a hypothesized 20ms sampling period, their system must be using a wheel that has only 8 counts per revolution. In order to get greater RPM measurement resolution while keeping their 8 CPR sensor, they would need to have a longer sampling interval (longer than 20ms).

Similarly, with a 250 CPR sensor such as 1519 used in 2012, our computed RPM values are discretized at units of 12RPM. Measuring wheel speed to the nearest multiple of 12RPM was fine for our wheel shooter last year. Measuring to the nearest 375RPM might be troublesome.
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