Thread: ADXRS150 gyro yaw rate sensor
View Single Post
  #13   Spotlight this post!  
Unread 16-10-2004, 20:34
Gdeaver Gdeaver is offline
Registered User
FRC #1640
Team Role: Mentor
  
Join Date: Mar 2004
Rookie Year: 2001
Location: West Chester, Pa.
Posts: 1,358
Gdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond reputeGdeaver has a reputation beyond repute
Re: ADXRS150 gyro yaw rate sensor
3 axis digital compasses are over the 100$ any part rule. However if the assumption is that the robot was always on a horizontal plain (no ramp), a 2-axis compass could be used. Digi-key sells Honeywell line of magneto-resistive chips. The Honeywell solution would require some work. They need
op-amps to condition the output for a micro controller. This limits their use
to teams that can make a custom board. Then they need allot of programming
to get to a degree heading result. The other solution is PNI corps line of integrated digital compass chips. The 2-axis chips output a binary or decimal heading in a 2 byte spi interface. The PNI solution is much more usable. None of the listed electronics suppliers stock the PNI line. I believe they are available from Newark as a special order. Does this source meet First rules?
As for local magnetic fields around a robot, I haven't explored that. I just got the PNI chip working. I envision a separate microcontroler reading the heading
and encoder interrupts, processing the info and sending the data to the robot controller with the robot controller working with a yaw rate sensor to drive straight during autonomous mode.
Gary Deaver