24-01-2006, 23:31
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Electrical Engineer / Computer Geek
AKA: Eldarion Telcontar
no team (Teamless Orphan)
Team Role: Alumni
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Join Date: Nov 2005
Rookie Year: 2005
Location: Númenor
Posts: 558
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Re: Speed Sensor for Ball Shooter
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Originally Posted by Justin Stiltner
Does anyone have and idea for a speed sensor for the ball shooting wheels, I don't really want to use encoders, I had an idea of using a frequency to voltage IC and connecting it to the analog port of the R/c as I don't need direction or exact positioning and would rather not go into interrupts. The wheel would have an optical sensor mounted with a disk on the shaft or something similar, however all the frequency to voltage chips I saw wanted about 15 volts in and like 100Hz. The frequency is doable, but theres no way I want 12v battery voltage going into the r/c if something goes wrong. So anyone have an idea?
my priorities
Very little coding
cheap
commonly available
easy to interface
not necessarily in that order.
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Unfortunately, interrupts are probably the best way to go (cheap, commonly available, easy to interface). Kevin Watson does have some interrupt / encoder sample code at http://kevin.org/FRC
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