Go to Post All I wanted was a game hint.... :( - JohnBoucher [more]
Home
Go Back   Chief Delphi > Technical > Electrical
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #36   Spotlight this post!  
Unread 17-02-2014, 13:53
Lightfoot26's Avatar
Lightfoot26 Lightfoot26 is offline
Just Out For A Rip, Bud...
AKA: Seth Lightfoot
FRC #1625 (Winnovation)
Team Role: Mentor
 
Join Date: Dec 2009
Rookie Year: 2010
Location: Winnebago, IL
Posts: 120
Lightfoot26 is just really niceLightfoot26 is just really niceLightfoot26 is just really niceLightfoot26 is just really niceLightfoot26 is just really nice
Re: What sensors are used to detect the hot LED lights on the FRC field?

Quote:
Originally Posted by Alan Anderson View Post
You only need to check for the presence or absence of reflections from the horizontal target. A Class 1 laser sensor can be pointed at the dynamic vision target before the match begins, and it'll tell you whether or not the target is still there a moment after autonomous mode starts.
You hit the nail on the head Alan!

The sensor I posted actually has a built in sensing light that illuminates when "the circuit is complete" for lack of a better term. This is all internal to the sensor. If the target is present both a green and amber light located on the top of the sensor will illuminate, if there is power to the sensor, but the target is not present, only the green light illuminates. That's the elegance behind a sensor of this design. Very easy to recognize the presence of the target without any additional coding or alignment mechanism. We weren't sure if this was the route we could take pre-Team Update 1... but after we learned that pre match setup will have both targets revealed, we went for it!

Like I said before, camera stuff consumes a lot of resources (at least on our team) e.g. coding time, debug time, and bandwidth among others, and we only use vision if we rule out all other possibilities. 5 extra points didn't seem worth consuming those resources to us, but in 1625 nature... we still wanted those points! haha So we opted for the laser. Team 2451 (formerly 2949) did a similar laser setup in 2012, from which we drew inspiration.


EDIT: In regards to
Quote:
Originally Posted by NotInControl View Post
how do you know you are pointing ONLY at the horizontal target when placing on the field?
I guess it is a mixture of what I said above as well as both the retro-reflective properties of the tape and "trial and error" really... The retro reflectability of the tape will help us ensure there is no "spillage" of light from the vertical segment of tape, and "trial and error" helps improve our drive teams ability to position the sensor accurately. This "trial and error" methodology seems cumbersome yes, but most dead reckoned auton systems have some degree of this process.
__________________
Winnovation Team 1625 (2010-??)
  • Electrical/Programming Captain (2011-2013)
  • Auxiliary Driver (2012-2013)
  • Team Captain (2013)
  • Alumni (Graduated May 2013)
  • Electrical and Programming Mentor (2014-??)

Last edited by Lightfoot26 : 17-02-2014 at 14:18. Reason: Clarification
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 12:37.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi