View Single Post
  #7   Spotlight this post!  
Unread 31-01-2010, 11:00
Manoel's Avatar
Manoel Manoel is offline
Registered User
FRC #0383 (Brazilian Machine)
Team Role: Mentor
 
Join Date: Jun 2001
Rookie Year: 2000
Location: Porto Alegre, RS, Brazil
Posts: 608
Manoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond reputeManoel has a reputation beyond repute
Send a message via ICQ to Manoel Send a message via MSN to Manoel
Re: How Precise and Accurate is the Analog In on the Crio?

Quote:
Originally Posted by Tom Line View Post
My team and I have been discussing novel ways to measure the right amount to pull our shooter back. One of the things that was brought up as a neat possibility is a strain gage. We can get a strain gage that is temperature compensated for aluminum, and the wheatstone bridge we have can be powered by the 5 volts, however the return voltage from a strain gage is very small - in the millivolt range.

I'm concerned that:
#1 The Crio won't be able to accurately measure values that small repeatably
#2 The strain gage will be affected by the jostling and slamming around that will result when we put it on our shooter.

Can someone chime in on the Crio resolution and accuracy? (Perhaps Eric?)
Are you using a winch to pull your shooter back? If so, may I suggest using the magnetic encoders supplied in this year's kit - the non-contact characteristic makes it perfect for something that must unwind as quickly and with as little drag as possible.
__________________
Manoel Flores da Cunha
Mentor
Brazilian Machine
Team # 383
Reply With Quote