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Jul 31, 2011, 04:43 AM
Registered User
Help!

Yaw gyro KK board not responding


Hi,

I hope this is not a repost, but the search function didn't solve my problem .

I have received my KK 5.5 Blackboard and installed it on my Tricopter frame. Somehow the yaw gyro seems to be unresponsive.

Pitch and roll work just fine and it tries to stabilise the tricopter like it should.

The tailservo responds normally to yaw inputs that are given by the transmitter. Also when I put the tailservo on motorpins 1, 2 or 3 it instantly tries to compensate for movement.

I am lost here. Can this be a defective yaw gyro on the board. Is there any other way to check this. Or am I missing something simple (I hope )

Firmwares tried:
- Tricopter (V1.6 [m168] kapteinkuk (mirrored by lazyzero.de)
- Tricopter (V2.0 [m168] kkmulticopter.kr)

On V2.0 I also tried the pins on motor 5 (reverse), but it makes no difference

Maybe I should just put on an extra GY401 .

Regards,
Menno
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Jul 31, 2011, 04:59 AM
Registered User
my search function turns up this thread

Hope it helps....
Jul 31, 2011, 05:55 AM
Registered User
Hi Mike,

Thanks for the response. I actually did see that post, but I missed the fact that he had manual control over the tail servo, just like me.

Hmm, seems like I have a simular problem.

And I hoped i would finally get some airtime this weekend .

I am not sure which points I should measure on the board with my mulitmeter to check??
Jul 31, 2011, 06:09 AM
Registered User
Quote:
Originally Posted by Menno View Post
I am not sure which points I should measure on the board with my mulitmeter to check??
OK - the Yaw gyro is the vertical board at the back.

The 3 connections at the base are (left to right): Supply (~5V) : Gyro Out (~1.35V) : Ground

So you just need to measure the Gyro Supply and Output voltages relative to the Ground connection.
Jul 31, 2011, 06:20 AM
Registered User

Yaw gyro


Quote:
Originally Posted by Menno View Post
Hi Mike,

Thanks for the response. I actually did see that post, but I missed the fact that he had manual control over the tail servo, just like me.

Hmm, seems like I have a simular problem.

And I hoped i would finally get some airtime this weekend .

I am not sure which points I should measure on the board with my mulitmeter to check??
I'm not sure either but I will take a look at the soldering on the board. Can sympathise with your frustration as I have had so many conflicting solutions but hey I will crack it at some stage. I'll let you know how I get on when I ref lash my board.

Mike
Jul 31, 2011, 06:52 AM
Registered User
Quote:
Originally Posted by Mike Barton View Post
OK - the Yaw gyro is the vertical board at the back.

The 3 connections at the base are (left to right): Supply (~5V) : Gyro Out (~1.35V) : Ground

So you just need to measure the Gyro Supply and Output voltages relative to the Ground connection.
I am measuring ~4 volt on the left connection and ~1.4 volt on the middle one
Jul 31, 2011, 08:44 AM
Registered User
Quote:
Originally Posted by Menno View Post
I am measuring ~4 volt on the left connection and ~1.4 volt on the middle one

Just measured mine and have about 4.6 and 1.7 on the same connectors. Not sure whats that telling me about the problem though other than I am getting roughly the right voltage at those pins.
Jul 31, 2011, 08:48 AM
Suspended Account
The middle one should change as you rotate the board around.
Jul 31, 2011, 09:22 AM
Registered User
Quote:
Originally Posted by Menno View Post
I am measuring ~4 volt on the left connection and ~1.4 volt on the middle one
the gyro voltage appears fine.
the 4V seems a bit low (should be at least 4.7v)
What is the voltage across R4 (should be ~90mV) ?

Quote:
Originally Posted by mikehawkey View Post
Just measured mine and have about 4.6 and 1.7 on the same connectors. Not sure whats that telling me about the problem though other than I am getting roughly the right voltage at those pins.
the 1.7V output is way too high (assuming standard murata gyros)
What is the voltage (Aref) on pin 20 of the ATmega (should be ~1.64V) ?
What are the voltages for the other gyros ?

As an example, my KK blackboard gives 4.78V and 1.53V (<=high, so I have changed R10) respectively
Aug 05, 2011, 02:47 PM
Registered User
Thanks everybody for the responses. I've returned the defective board to the seller and he has send me a new one. The gyros on the new board work like they should.

I guess this thread can be closed.
Nov 26, 2013, 09:58 AM
Registered User
fmata's Avatar
I have a board that broke off wanted to run some wires to the end points..
Would you know where Yaw Gyro Out would go?

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Name: Design Schematics for the v.5.5 SMD PCB.jpg
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Name: kk 5 5 board.jpg
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Thanks


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