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Brand New V3 Saturated Accelerometers

Posted by Kyle Grim on February 16, 2012 at 9:31am

Hey all-

 

I'm a newb to DIY Drones but have been an Arduino tinkerer for a while.  I received my new V3 in the mail yesterday; soldered it up and loaded the code with no issues.


Upon first power up it returned a solid red light (sensors saturated).  I booted the windows test program and although the IMU does return information, it appears that the accelerometers are way out of wack.  I reloaded the code multiple times... altered the scalars of the accelerometer data by orders of magnatude... can't get that damn light to turn off!

 

Has anyone else had this problem?

 

Thanks, -Kyle

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Replies

  • charles1317 March 26, 2012 at 8:36pm

    It looks like they are both on to me.

    I found that the red led staying on had nothing to do with the accelerometers. If you look at line 124 in arduimu.pde you should see that the yellow led is defined to the same output as the red led for version 3 of the arduimu. On the V3 board the yellow led is hardwired to the sck line. This line is the serial clock line for the I2c interface for the MPU-6000.  This means you can't define the yellow led to do anything as it is hardwired. I found that by commenting out all instances of the yellow led in arduimu.pde including the define line for the yellow led that the red led work correctly. It's still too sensitive but it works.

  • Vaibhav Paraashar March 4, 2012 at 8:11pm

    Hi kyle. I got the V3 by mail last week. I'm totally new to IMUs. I don't know how to get started. I believe the first step after unboxing is to solder the 6 pin header on to the FTDI slots right? Could you post pictures of your assembly please? 

    thanks.

  • Christophe Sandoz February 21, 2012 at 7:25am

    Hi Kyle,

    I had the same problem and I'm finally getting closer to correct readings. Since I'm testing the board by itself with an FTDI cable, I disable this parameter in the "user parameter" of the arduimu.pde file that I openened with Arduino 0023

    "#define SPEEDFILT 2" changed to "#define SPEEDFILT 0"

    It cancels the speed filter for yaw drift and when I set it to "0" the red led stays OUT.

    The readings of the accelerometer still seem a bit off and I keep looking but at least this red led is OUT!!

    Cheers

    Chris

  • Christophe Sandoz February 19, 2012 at 3:11am

    I got the same, I received my V3 board early this week and didn't get a chance on getting this red led out...

    Cheers Chris

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