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Old Aug 18, 2010, 11:27 PM
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Joined Mar 2010
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hello kapteinkuk,

i used the camerapantilt hex for the quad board and connected the servos @ 15,16 (atmega168) and tx channel 1 and channel 2 @ pin 2,3 respectively .. but led doesn't turn on .. and doesn't work either , please help me i have built the pan tilt frame ,waiting for the software to work for.. i have built the hex using your 168 headerfile . please help me . does this software need some modification in your hardware
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Old Aug 19, 2010, 01:54 AM
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Hi,
anyone using lpr/lpy550 and happy with them? my quad is very stable with gyros from hk401, 100% gain, but i can't get 550s to work, it's unstable, oscilates even with low gain. 550 are really cheap and seemed great alternative to hk401 so can someone share their proven design please?
Chris
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Old Aug 19, 2010, 01:54 AM
Member FPV UK
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Isle of Wight, UK
Joined Apr 2010
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Quote:
Originally Posted by fireslayer26 View Post
I'm thinking of trying this setup and wanted to get others opinions.

Jakub's 68cm fiberglass frame + FLYCAM Artist xm-L4500Pro camera mount.
Aske me in a day or so when I have fitted mine to the smaller frame

I ordered one of those yesterday to go on the smaller frame as putting the camera on top of the frame made it too top heavy on my setup. I have the KK board in a plastic tub on top of the frame so camera is about 3-4 inches above the upper frame, so wanted somehtign to undersling the camera and the Pro seems to be about the right sorta thigns, but concerned about the camera mount itself, as it does not look very good.

Will post more when I have it.

Mike.
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Old Aug 19, 2010, 02:17 AM
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Quote:
Originally Posted by chris_g_69 View Post
Hi,
anyone using lpr/lpy550 and happy with them? my quad is very stable with gyros from hk401, 100% gain, but i can't get 550s to work, it's unstable, oscilates even with low gain. 550 are really cheap and seemed great alternative to hk401 so can someone share their prooved design please?
Chris
lpr/lpy550 has different electrical characteristics to the hk401 gyros.
You are changing the R10 (original value 68 Ohms) to a different value when running this different gyro ?
For lpr/lpy550 (un-amplified output):
Zero-rate level 1.23V + ((2000d/s x 0.5mV/d/s)/1000) = 2.23V
R10 would therefore need to be a value of at least say 180 Ohms (200 may be safer) which would allow for up to 2.27V.
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Old Aug 19, 2010, 02:17 AM
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Germantown, MD, US
Joined Sep 2004
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Quote:
Originally Posted by chris_g_69 View Post
Hi,
anyone using lpr/lpy550 and happy with them? my quad is very stable with gyros from hk401, 100% gain, but i can't get 550s to work, it's unstable, oscilates even with low gain. 550 are really cheap and seemed great alternative to hk401 so can someone share their proven design please?
Chris
Do you use 1X or 4X output? I'm using 1X outputs and I'm happy with them



http://www.rcgroups.com/forums/showp...postcount=2077

-Thanh
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Old Aug 19, 2010, 02:45 AM
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Germantown, MD, US
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Quote:
Originally Posted by Mike Barton View Post
lpr/lpy550 has different electrical characteristics to the hk401 gyros.
You are changing the R10 (original value 68 Ohms) to a different value when running this different gyro ?
For lpr/lpy550 (un-amplified output):
Zero-rate level 1.23V + ((2000d/s x 0.5mV/d/s)/1000) = 2.23V
R10 would therefore need to be a value of at least say 180 Ohms (200 may be safer) which would allow for up to 2.27V.
In my test with the 1x output, I've never seen it reaches that high of a voltage. With a bench test and a fluke 179 in min/max mode, I see it's registers around 1.38v when I twist the gyro board.

The document here http://www.st.com/stonline/books/pdf/docs/15813.pdf (figure 4) shows it's max at 1.48v for 1X output and that's aligned with what I see. In fact I fly with the stock KK board (see above post)

I don't understand the part of the spec that says the measurement range is capable of 2000 degrees/sec, but chip is only 500 degrees / secs. Any idea?

Thanh
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Old Aug 19, 2010, 03:10 AM
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Quote:
Originally Posted by thanhTran View Post
In my test with the 1x output, I've never seen it reaches that high of a voltage. With a bench test and a fluke 179 in min/max mode, I see it's registers around 1.38v when I twist the gyro board.

The document here http://www.st.com/stonline/books/pdf/docs/15813.pdf (figure 4) shows it's max at 1.48v for 1X output and that's aligned with what I see. In fact I fly with the stock KK board (see above post)

I don't understand the part of the spec that says the measurement range is capable of 2000 degrees/sec, but chip is only 500 degrees / secs. Any idea?

Thanh
That is after 4X amplification according to spec.
Dan.
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Old Aug 19, 2010, 03:18 AM
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Originally Posted by dt8666 View Post
That is after 4X amplification according to spec.
Dan.
If you look at Table 3 section 2.1 of http://www.st.com/stonline/books/pdf/docs/15813.pdf, it says FS measurement range (NOT AMPLIFIED) is 2000*/s. The 4X out is still only 500*/s. Spec wrong?

-Thanh
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Old Aug 19, 2010, 03:24 AM
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Quote:
Originally Posted by thanhTran View Post
In my test with the 1x output, I've never seen it reaches that high of a voltage. With a bench test and a fluke 179 in min/max mode, I see it's registers around 1.38v when I twist the gyro board.
Thanh
You're not twisting it enough

Quote:
Originally Posted by thanhTran View Post
The document here http://www.st.com/stonline/books/pdf/docs/15813.pdf (figure 4) shows it's max at 1.48v for 1X output and that's aligned with what I see. In fact I fly with the stock KK board (see above post)
Thanh

I don't understand the part of the spec that says the measurement range is capable of 2000 degrees/sec, but chip is only 500 degrees / secs. Any idea?

Thanh

I think this datasheet is slightly suspect as Figure 4 doesn't agree with Table 3. The un-amplified outputs in Table 3 say 2000 degrees / sec whereas Figure 4 shows 500 (or perhaps I'm not reading it right).
Using 2000 degrees / sec in Figure 4 would give the same s suspect since you would get the same voltage out

If yours flys ok then I would recommend to chris_g_69 to go with the same as you ...
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Old Aug 19, 2010, 03:38 AM
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lpr550/ly550

normal
zero rate 1.23 + 500*0.5mV = 1.48V

amplified
zero rate 1.23 + (500*0.5mV)*4 = 2.23V
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Old Aug 19, 2010, 03:48 AM
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Description: I use 1x output. What about gyros orientation on the board, mine are rotated 45 degrees?
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Old Aug 19, 2010, 03:58 AM
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Quote:
Originally Posted by chris_g_69 View Post
Attachment 3424234I use 1x output. What about gyros orientation on the board, mine are rotated 45 degrees?
As long as you align the gyro with the arms, I don't think the orientation would cause problem. Mine is like this:

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Old Aug 19, 2010, 04:02 AM
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Quote:
Originally Posted by Mike Barton View Post
You're not twisting it enough




I think this datasheet is slightly suspect as Figure 4 doesn't agree with Table 3. The un-amplified outputs in Table 3 say 2000 degrees / sec whereas Figure 4 shows 500 (or perhaps I'm not reading it right).
Using 2000 degrees / sec in Figure 4 would give the same s suspect since you would get the same voltage out

If yours flys ok then I would recommend to chris_g_69 to go with the same as you ...
Obviously with all the wires on a bench test duh
Certainly it's not a 2000*/s gyro, and with 1x output, it can't be 2.x volts. Speaking of this Vref, my first KK board with my own PCB was running at 2.5v so I'm fine either way. Spec says 1.48v and it's working happily in one of my stock tricopter board (1.6v vref). Quad flies with 2.5v vref.


EDIT: just did some reading live on my quad and with very strong twisting (of a average build 35+ year young guy ) of the arms, Fluke 179 says min 0.806v max 1.649v. Fluke may smooth out the reading a bit though
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Old Aug 19, 2010, 05:16 AM
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Joined May 2010
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OK Charl and Dion, I found the problem with Charl's chips. It was CHKDIV8 that was checked in the fuses section. This was dividing the clock speed by 8 and causing the long time till the LED flashed. I have reprogrammed them with the the latest firmware with the Arm/Disarm feature and will get them out today. Dion, Let me know if you want my guys in Zim to send you down a replacement, or if you are going to get a programmer yourself to upload future firmwares.


Cheers,

Niall
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Old Aug 19, 2010, 05:24 AM
manuLRK
Belgium
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Quote:
Originally Posted by chris_g_69 View Post
Attachment 3424234I use 1x output. What about gyros orientation on the board, mine are rotated 45 degrees?
This is my 3D cube...
manuLRK
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