View Single Post
  #19   Spotlight this post!  
Unread 14-01-2005, 07:19
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,798
Al Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond repute
Re: Hall Effect Sensor.

Quote:
Originally Posted by gwross
Al, there's a problem with your graph. The way you've drawn it. Each sensor is always low whenever the other sensor goes high. Without keeping track of time intervals between pulses, it won't be possible to tell the direction of rotation.

To reliably get direction information, you would need to position the sensors just far enough out of phase that the pulses overlap as illustrated below. Then when you see one of the lines go high, you can just check the other one, and immediately know the direction.
Greg,
Thanks for the correction. I need to stop trying to rush a post before I leave work. You don't get a chance to go back and look at what you've done.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.