Go to Post "If a student CAN do it, a student SHOULD do it." - Mr. Lim [more]
Home
Go Back   Chief Delphi > Technical > Programming
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
  #10   Spotlight this post!  
Unread 02-02-2017, 19:02
golf_cart_john's Avatar
golf_cart_john golf_cart_john is offline
Registered User
AKA: John W
FRC #0095 (Grasshoppers)
Team Role: Coach
 
Join Date: Sep 2003
Rookie Year: 2004
Location: Lebanon, NH
Posts: 38
golf_cart_john is a jewel in the roughgolf_cart_john is a jewel in the roughgolf_cart_john is a jewel in the rough
Re: Reducing noise on the MaxBotix ultrasonics?

Quote:
Originally Posted by dk5sm5luigi View Post
Given the noise we had seen in the past we switched to IR Rangefinders and probably won't go back. We found one that does up to 18 feet and the noise was easier to work with than the ultrasonic.

We listed them here: http://findrobotparts.com/sensors/ca...es/13/tags/635
We ran into some inconsistency in range with those. They seemed to report a range of a few inches when the wall is perpendicular to the sensor, then over a foot when the wall is still a few inches away but several degrees away from a "square" approach.

If I'm not mistaken, they judge range by reflection brightness, rather than time of flight or angle. So they're super sensitive to the reflectivity of the target. Since the wall of the airship is prime for specular reflections, its reflectivity varies widely based on how perpendicular the sensor is to the wall.

Did you find this to be an issue as well?
Reply With Quote
 


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 22:35.

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