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Open pins on apm/oilpan

Started this discussion. Last reply by David Cheney Jan 2, 2013. 11 Replies


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Knuckles904 replied to Rhosyn's discussion 3DR Pixhawk x2
"Hey, if the broken board is still available, I may be interested. I'm in Cincinnati as well. Great to see another nearby enthusiast! Sent pm"
Sep 18, 2015
Knuckles904 commented on Rob_Lefebvre's blog post Shhhh.... be vewy quiet, we're hunting Dwones!
"I would highly encourage anyone with strong feelings towards the fevered anti-drone legislation to take a step back and see the similarities towards the current anti-gun push. Highly reactionary and emotional responses, media feeding-frenzy, stating…"
Feb 24, 2013
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Feb 19, 2013
David Cheney replied to Knuckles904's discussion Open pins on apm/oilpan
"I wonder if I can hijack pin 2 and use it for an (input) interrupt. will bad things happen if I do this?"
Jan 2, 2013
Knuckles904 commented on Mark Harrison's blog post Chris Anderson leaves Wired, goes to some startup
"Congratulation Chris. It's so cool seeing someone be able to pursue their passion wholeheartedly. I hope I'm in your shoes sooner rather than later."
Nov 3, 2012
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"Lol, 4 left. Hurry!!!"
Oct 6, 2012
Knuckles904 commented on Peter Bell's blog post German Multicopter Lifts Human Pilot
"Alright experts, deconstruct! I didn't see anything that seemed too far from off the shelf. Anyone recognize those motors, props or something of similar size. I don't see any reason the control scheme from a simple quad couldn't have…"
Oct 31, 2011
Knuckles904 replied to Grips's discussion Detailed comparison of the Maxbotic Sonar sensors
"Pay a lot of attention to the fact that they behave differently depending on what youre trying to pick up. If youre trying to just find the ground, get the one with max distance and wide beamwidth. If youre trying to find scan for a pencil, get a…"
Sep 27, 2011

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About Me:
UF MechE student
Please tell us a bit about your UAV interest
Helis, Quads, planes, I love all robotics

Knuckles904's Blog

$40 IMU now available at your local walmart...with a little help from radioshack

Posted on July 28, 2009 at 10:09am 5 Comments

I posted on here a while ago that the wii motion plus gyro sensor had been cracked but didnt really get much buzz about it. Well one problem with using the M+ in addition to the nunchuck to supply the accelerometer is that both are on the same I2C address. I found a real easy way to get around that problem and now the possibility opens up for a $40 6 sensor system. Now, I love that diydrones is offering an IMU system now to play with, but being a poor college student I cant shell out over $100… Continue

Wii Motion Plus Decoded

Posted on June 23, 2009 at 12:00pm 3 Comments

Hi everyone, Ive been a member here for a while and though Ive gotten a lot out of following along with all the great projects here, I havent really had much to contribute back (aside from referring friends). Well now I do! I posted this over at the arduino forums but I figured it would have a lot of impact here too: I have successfully read the gyro data from the Wii Motion Plus peripheral. I posted code and some additional info on my shiny new blog:… Continue

Comment Wall (3 comments)

At 5:25am on January 16, 2011, andrew said…

Hi Miles,

I used your wii motion+ code and tested the chip on my turnable at 33.3333 rpm and found that the yaw gyro appears to work alright, giving 21 counts*sec/°.

When putting the chip side up to test the roll gyro, the chip puts out real strange data. Did you test that?

I get the following output:

WM+ tester

   yaw: 8318   pitch: 7984   roll: 8187         //calibration zeroes
   yaw: 22     pitch: 14     roll: 24           // still
   yaw: -2     pitch: 12     roll: 17
   yaw: -9     pitch: 12     roll: 30
   yaw: -22    pitch: 25     roll: 24
   yaw: -9     pitch: 19     roll: 24
   yaw: 18     pitch: 6      roll: 30
   yaw: -16    pitch: 12     roll: 36
   yaw: 5      pitch: 12     roll: 11
   yaw: 45     pitch: 93     roll: 3812         // turning (side up) at 33.333 rpm
   yaw: 324    pitch: 328    roll: 4140         // clockwise for roll axis test
   yaw: 555    pitch: 563    roll: 4426
   yaw: 378    pitch: 384    roll: 4227
   yaw: 575    pitch: 588    roll: 4475
   yaw: 793    pitch: 762    roll: 4692
   yaw: 956    pitch: 917    roll: 4903
   yaw: 1133   pitch: 1047   roll: 1028
   yaw: 1350   pitch: 1245   roll: 1233
   yaw: 1575   pitch: 1456   roll: 1431
   yaw: 1752   pitch: 1617   roll: 1042
   yaw: 1395   pitch: 2033   roll: 1365
   yaw: 1674   pitch: 1426   roll: 1346
   yaw: 246    pitch: 1271   roll: 645
   yaw: 1626   pitch: 1450   roll: 1427
   yaw: 1674   pitch: 1500   roll: 1464
   yaw: 1688   pitch: 18     roll: 99
   yaw: 1042   pitch: -230   roll: 409
   yaw: -10    pitch: -2     roll: 14           // still
   yaw: -17    pitch: -2     roll: 20
   yaw: -3     pitch: -8     roll: 1
   yaw: -10    pitch: 4      roll: 14
   yaw: -10    pitch: 4      roll: 1


At 5:32am on January 16, 2011, andrew said…

it looks as if data add up in the yaw and pitch memory of the on board IC and when they reach 1000 counts the whole thing goes mad. the data they show are useless on all channels.

Do you have an idea what is happening here?

please let me know what I CAN DO TO SOLVE THIS MYSTERY,

thanks, newbee

At 12:46am on May 19, 2011, Jin said…
Hi, Knuckles. I am freshman for quadrotor. Do you have tried the path tracking for quadrotor? Do you think that autopilot can communicate with other board through serial port , say, change the original serial port that connected to the Xbee to another board?

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