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Old Jun 25, 2012, 12:19 AM
cool, how high does it go?
Mauronic's Avatar
United States, CA, Los Angeles
Joined Jun 2012
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Hey guys -

New to RC and having some problems calibrating my transmitter for my stealth armour. I am using a Futaba T7C and the paris just has the USB and a receiver hooked-up - no motors or anything.

First, I set the endpoints for each of the 4 channels to 105% for each direction. Then I centered the sticks and used the sub-trim function to set the uSec readings to 1500. Then I moved the sticks to the extreme positions and adjusted the sub-trims to get the 1095 and 1905 readings. The problem is, when I go back to center the midpoint readings were thrown out of whack to 1480, etc! Any ideas?

pete
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Old Jun 25, 2012, 12:28 AM
X-Ikarus
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United Kingdom, North York
Joined Feb 2003
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Quote:
Originally Posted by redblur View Post
Hi guys, i'm new in multiwii world, just build my DIY Quad ,Motor to motor 17cm and already flying super stable with Crius Multiwii. but somehow when i put a large throttle instantly, the quad goes wobble like crazy untill i landed it.

Don't know what's wrong, hmm
Try increasing "Throttle PID Attenuation" (yours is at 0 )
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Old Jun 25, 2012, 01:48 AM
HeliAP'er!
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Surrey, UK
Joined Aug 2003
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Quote:
Originally Posted by Pete Mauro View Post
Hey guys -

New to RC and having some problems calibrating my transmitter for my stealth armour. I am using a Futaba T7C and the paris just has the USB and a receiver hooked-up - no motors or anything.

First, I set the endpoints for each of the 4 channels to 105% for each direction. Then I centered the sticks and used the sub-trim function to set the uSec readings to 1500. Then I moved the sticks to the extreme positions and adjusted the sub-trims to get the 1095 and 1905 readings. The problem is, when I go back to center the midpoint readings were thrown out of whack to 1480, etc! Any ideas?

pete
Hi Pete,

The sub-trim function is for an entire channel, rather than a set of adjustments for different parts of a channel's output. So if you adjust the sub-trim to get 1500 in the centre, and then adjust the sub-trim again, the centre-point will move. I think provided the end-points are above 2000 and below 1000 you don't need to adjust them that precisely. I believe having 1500 in the centre is more important (although don't quote me on that!).

Cheers


David
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Old Jun 25, 2012, 03:01 AM
vin diousse
Joined Nov 2011
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for each channel u should adjust the low and high EPA (mine are 125%) to meet the 1000 and 2000 limits then you adjust your sub trim to get the 1500 center value
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Old Jun 25, 2012, 09:03 AM
SILURIA / UK
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United Kingdom
Joined Jun 2009
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Try to aim for what is in the code.
Defaults are:
Centre:1500
Low:lower than 1100
High:higher than 1900


1 - Center trims on tx
2 - Adjust subtrim to get to 1500. You will get some variation as you move sticks in different directions and it re-centers. Go for best average!
3 - Adjust endpoints so that it always goes past Low/High. I aim for 15 points clearance.

Also need throttle to go above/below High and Low values, but calibrating ESC means have some flexibility. Calibrate after any changes!
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Old Jun 25, 2012, 09:50 AM
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You might want to change your centre from 1500 to 1520 if you are using futaba TX
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Old Jun 25, 2012, 12:51 PM
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Sud Ouest de france Saint vincent de tyrosse (dpt40 lande)s
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Navigatron v2 - I2C GPS

quadri gps multiwii (2 min 38 sec)
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Old Jun 25, 2012, 03:53 PM
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United Kingdom, England, Nottingham
Joined Nov 2002
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I posted earlier that I had a problem with my new GY-521 Mpu6050 gyro / acc
I had a play around with the code and managed to get it working using the define already in the sketch and then altering the orientation like below

Code:
 #define MPU6050       //combo + ACC
Code:
//if you want to change to orientation of individual sensor
      #define ACC_ORIENTATION(X, Y, Z)  {accADC[ROLL]  =  -X; accADC[PITCH]  = -Y; accADC[YAW]  = Z;}
      #define GYRO_ORIENTATION(X, Y, Z) {gyroADC[ROLL] = Y; gyroADC[PITCH] =  -X; gyroADC[YAW] = -Z;}
      //#define MAG_ORIENTATION(X, Y, Z)  {magADC[ROLL]  = X; magADC[PITCH]  = Y; magADC[YAW]  = Z;}
Could one of the devs check this and maybe create a define in future release for this little board as I think its going to be quite popular

I managed to do a small test and it all seemed to work well the frame a old twisted wooden quad so don't expect to much, its just to show the sensor is working as it should

Wooden Quad With Paris V3 With Mpu6050 Gyro / Acc Test (2 min 53 sec)
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Old Jun 25, 2012, 04:12 PM
HeliAP'er!
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Quote:
Originally Posted by f0cyq View Post
Very impressive position hold! Was this using a barometric sensor for height hold too?

Also, is this using current MultiWii code or one of the development builds?

Many thanks!


David
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Old Jun 25, 2012, 04:29 PM
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Sud Ouest de france Saint vincent de tyrosse (dpt40 lande)s
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Quote:
Originally Posted by Hogster View Post
Very impressive position hold! Was this using a barometric sensor for height hold too?

Also, is this using current MultiWii code or one of the development builds?

Many thanks!


David
hello
(IMU 10DOF LLC) drotek
yes activation bmp085+bma180+HMC5883+Navigatron v2 - I2C GPS
code MultiWii_dev_20120622
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Last edited by f0cyq; Jun 25, 2012 at 04:36 PM.
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Old Jun 25, 2012, 04:51 PM
Hulk likes flying things
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United States, IN, Kokomo
Joined May 2008
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Quote:
Originally Posted by Gaza07 View Post
I posted earlier that I had a problem with my new GY-521 Mpu6050 gyro / acc
I had a play around with the code and managed to get it working using the define already in the sketch and then altering the orientation like below

Code:
 #define MPU6050       //combo + ACC
Code:
//if you want to change to orientation of individual sensor
      #define ACC_ORIENTATION(X, Y, Z)  {accADC[ROLL]  =  -X; accADC[PITCH]  = -Y; accADC[YAW]  = Z;}
      #define GYRO_ORIENTATION(X, Y, Z) {gyroADC[ROLL] = Y; gyroADC[PITCH] =  -X; gyroADC[YAW] = -Z;}
      //#define MAG_ORIENTATION(X, Y, Z)  {magADC[ROLL]  = X; magADC[PITCH]  = Y; magADC[YAW]  = Z;}
Could one of the devs check this and maybe create a define in future release for this little board as I think its going to be quite popular

I managed to do a small test and it all seemed to work well the frame a old twisted wooden quad so don't expect to much, its just to show the sensor is working as it should

http://youtu.be/_9q_sJTuwAs
Where did you source from?
I think there are more than 1 places to get this from.
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Old Jun 25, 2012, 05:12 PM
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I got mine from Here
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Old Jun 25, 2012, 05:26 PM
Hulk likes flying things
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United States, IN, Kokomo
Joined May 2008
613 Posts
Thanks.
I am personally tired of little or no documentation with these multiwii things.
I am NOT going to buy anything without documentation.
There are so many things that a novice has to hurdle and without information it is too easy to trip.
Assumptions cannot be made, and I don't have instrumentation and the knowledge to experiment.
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Old Jun 25, 2012, 05:29 PM
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Unfortunately, I have not seem much in the way of documentation outside of these forums.
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Old Jun 25, 2012, 07:21 PM
An ordinary sort of incredible
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United States, TN, Knoxville
Joined Dec 2004
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Documentation?

There is no such thing... We generally make it up as we go. Sometimes I don't even remember how I got my results.
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