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Bug #491

ADC ref voltage issue with range finders

Added by Kevin Woo almost 14 years ago. Updated over 12 years ago.

Status:
Worksforme
Priority:
Normal
Assignee:
Chris Mar
Category:
Hardware
Target version:
Hardware
Start date:
05/01/2009
Due date:
10/08/2010
% Done:

100%

Description

we run at 3.3V, rangefinders at 5V...wtf botrics

History

#1 Updated by John Sexton over 12 years ago

Kevin/Austin, is this still an issue?

#2 Updated by Kevin Woo over 12 years ago

No idea. I would look up the sensors datasheet and see what they take and
then measure what they're actually getting.

#3 Updated by John Sexton over 12 years ago

  • Assignee changed from Austin Buchan to Alex Zirbel

We need to investigate and see if this is still an issue.

#4 Updated by Alex Zirbel over 12 years ago

  • Due date set to 10/08/2010
  • Assignee changed from Alex Zirbel to Chris Mar

Need to look into this for the next meeting.

#5 Updated by John Sexton over 12 years ago

  • Status changed from Assigned to Worksforme
  • % Done changed from 0 to 100

The data sheet for the rangefinders says that rangefinders are powered at 5V, but output at 3.3V. The processor is running on 3.3V, so we expect that the processor should be using the correct reference voltage for the 3.3V output of the rangefinders. According to the data sheets, we should be using the full analog range for the rangefinders.

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