Re: [Paparazzi-devel] Paparazzi for a Quadrotor -- should i start by using a Tiny V2.1 ??

[antoine drouin]

Hi

the booz2 imu produces its analog 5V for the gyros with a LDO
(lp2992), so you need to supply it with a tension greater than 5V +
the LDO dropout (450mv)
The booz controller board produces a 6.5V with a linear reg directly
from the battery voltage to avoid any switching supply noise in the
analog voltage.
 The lp2992 is rated for 16V, so if your capacitors have the same
rating, you could try to run the IMU directly from your 3 cells lipo
pack. I haven't tried it
Maybe the best way is still to connect the IMU to the booz controller
board instead of to a tiny

Regards

Poine

2009/5/28 郭 flying pig <address@hidden>:
> Hi there
>
>   I have some question also regarding the BOOZ_IMU, so it can connect
> directly to TinyV.2.11? but from the Sch, it need to supply 6.5V? or it is
> better to connect BOOZ_IMU to BOOZ_main ?
>   From what i guess when i read though all the sch,  Booz_main is the
> controller, which connect to IMU and GPS (the gps for booz), am i right ?
>
>
>
>
>
>
>
> Thanks
>
>                                                          Chen
>
>> Date: Wed, 27 May 2009 13:11:06 -0700
>> Subject: Re: [Paparazzi-devel] Paparazzi for a Quadrotor -- should i start
>> by using a Tiny V2.1 ??
>> From: address@hidden
>> To: address@hidden
>>
>> Hello
>>
>> > At this point of the discussion here and with Anton on the IRC, i would
>> > appreciate if some of you could say i am taking the right start :
>> > As the new Booz2 hardware is not available , i was thinking to start my
>> > quadrotor project in that way :
>> >
>> > 1)buy from a PPZ user an used Tiny v2.1 board ...
>> > 2)build an "homemade" 6 DoF IMU , probably using sensors boards from
>> > Sparkfun
>> > 3)Connect that IMU to the Tiny board
>>
>> I doubt you will be able to achieve good perfromances with that solution
>> You gyros will be wiggling on the sparkfun sensor boards, the wires
>> connecting them to the tiny will inject alot of noise in the fragile
>> analog signal and the 10 bits ADCs of the LPC will give you a big
>> discretization.
>>
>> If you intend to assemble hardware, i would rather suggest to assemble
>> a booz2 IMU (http://poinix.org/images/imu_v1_1.jpg) - CAD files are
>> available in the paparazzi4 svn at savannah (
>> paparazzi4/trunk/hw/booz/)
>> The biggest problem beeing soldering the BGAs gyros.
>>
>> > This should allow to be able to fly my quadrotor and start to use PPZ
>> > while
>> > waiting the Booz2 hardware to be available and PPZ software to be
>> > available.
>>
>> Software is available in the savannah svn. Navigation is even there,
>> the performances is just not completely satisfying. The stabilisation
>> and vertical guidance have satisfying performances
>>
>> http://poinix.org/video/booz2_step_roll.avi
>> http://poinix.org/video/booz2_vert_ctl_v0.2_mass_2.mp4
>>
>>
>> Regards
>>
>> Poine
>>
>>
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