Razor 9DOF HP filter removal (original 16MHz version)

For those with the 16HMz AT328P version of the SparkFun Razor9DOF board who also want to run the DCM based AHRS code, this may be of interest.

First read Jordi's post for the ArduIMU and Razor6DOF boards:

To remove the 3 highpass filters from the original 9DOF board, C1,C2 and C19 are removed and replaced with shunts (or just shorted). R5,R8 and R16 are also removed. Photo below shows board after modification with capacitor locations marked "J" and resistor locations marked "X".



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3D Robotics
Comment by Jordi Muñoz on February 15, 2010 at 11:24pm
Sorry about that, i sent the alert to sparkfun a little bit late to remove the High Pass Filter.
Comment by Mark Whitehorn on February 16, 2010 at 7:42am
No problem Jordi, and thanks for sharing your work. This is really great stuff.

Also, this was a good SMT rework exercise for me and now I know I can hand solder 0603 parts if I want to use a few on my next PCB design.

Developer
Comment by Mark Colwell on February 16, 2010 at 9:15am
Nice work, your mods should work great..
Comment by Mark Whitehorn on February 21, 2010 at 12:46pm
Thanks, Mark. I'm wondering if the megnetometer can be located far enough from stray magnetic fields on an RC plane. Seems reasonable to me, since David Anderson had good success with a Microstrain 6DOF+mag IMU like this:

Mu-metal shielding around the big motors might also do the trick.
Comment by Andrew Whipple on February 21, 2010 at 1:07pm
yea right, on an airplane/heli that's the last thing we want.
HAHA
Comment by Logan Greenlee on November 15, 2010 at 10:22am
Does anyone know if this is required for the boards marked 12/28/09?
Comment by Mark Whitehorn on November 15, 2010 at 10:43am
The board I modified was purchased in January 2010, but has no date marking. Later boards which do not need modification shouldn't have R5,R8,R16 installed. Modified boards will also have shunts (zero ohm resistors) installed in the capacitor locations.

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