Bug #491

ADC ref voltage issue with range finders

Added by Kevin Woo almost 5 years ago. Updated over 3 years ago.

Status:WorksformeStart date:05/01/2009
Priority:NormalDue date:10/08/2010
Assignee:Chris Mar% Done:

100%

Category:Hardware
Target version:Hardware

Description

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

History

#1 Updated by John Sexton over 3 years ago

Kevin/Austin, is this still an issue?

#2 Updated by Kevin Woo over 3 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 3 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 3 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 3 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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