|
Re: Best way to measure period between pulses? Counters and FPGA
Quote:
Originally Posted by jhersh
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.
__________________
Ken Streeter - Team 1519 - Mechanical Mayhem (Milford Area Youth Homeschoolers Enriching Minds)
2015 NE District Winners with 195 & 2067, 125 & 1786, 230 & 4908, and 95 & 1307
2013 World Finalists & Archimedes Division Winners with 33 & 469
2013 & 2012 North Carolina Regional Winners with teams 435 & 4828 and 1311 & 2642
2011, 2010, 2006 Granite State Regional Winners with teams 175 & 176, 1073 & 1058, and 1276 & 133
Team 1519 Video Gallery - including Chairman's Video, and the infamous "Speed Racer!"
|