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Unread 11-01-2003, 22:16
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kmcclary kmcclary is offline
Founder 830/1015;Mentor 66/470/1502
FRC #0470 (Alpha Omega Robotics)
Team Role: Engineer
 
Join Date: Aug 2001
Rookie Year: 1994
Location: Ann Arbor, MI
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Re: Re: Current Monitoring system questions

Quote:
Originally posted by Rickertsen2
WHoa i though it was illegal to have custom circuits provide input!!!!!!!! SWEET!!!! OMG ITS NOT? awesome!!!
Oh yea.. I thought we've ALWAYS been able to talk to the RC. Wildstang's innovation was to made a VERY NICE package for massaging and sending realtime data back to the dashboard.

Custom circuits just can't run DEVICES directly. No motor controller replacements, nor driving the motor controllers with the custom circuits. The RC is the ONLY device that's allowed to run the MOTION outputs.

This makes sense. This rule is to GUARANTEE the robot WILL stop when told to by the arena controller. If the custom circuit could directly affect any output device, FIRST couldn't guarantee shutdown, and you'd immediately have a safety hazard if it DIDN'T shut down. Since the inspectors can't check your circuits, it's simpler to rule that ONLY the RC can command "real" things.

Heck, if you think about it, if the custom circuit COULDN'T talk to the RC, what WOULD be the point of it beyond "fancy telemetry"??? The only real effect it's allowed is to tap the RC on the shoulder and say "Ahem... Pardon me... Here's something YOU should know about so YOU can do something about it..."

Quote:
Originally posted by bigqueue
You will notice that alot of teams measured across calibrated lengths of wire, or even placed very small value resistors in series.......we just measured the voltage drop across the circuit breaker and multiplied by different coefficients for 20A and 30A breakers. Simple...and works great. [...] I can pass along schematics if you are interested. -Quentin
Oh, please DO!

As a EE, I'm a big fan of custom circuits, and appreciate seeing the neat things everyone has come up with!

- Keith
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Keith McClary - Organizer/Mentor/Sponsor - Ann Arbor MI area FIRST teams
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