Comment by Amilcar Lucas on September 17, 2011 at 9:25am

Sorry, I do not get it. Do you need the IMU expansion board or not ?

 

Comment by Alexander on September 17, 2011 at 9:36am

Amilcar, it's a two board solution like APM+oilpan IMU board.

Only my the IMU board contains more sensors like compass and airspeed etc.

 

Comment by Amilcar Lucas on September 17, 2011 at 9:39am

OK, now I've looked more carefully and I see that there are two different boards on the picture. For some reason I assumed it was the top/bottom of the same board.

 

Sorry for the silly question.

 

Comment by Patrick L on September 17, 2011 at 11:14am

Well done, a nice and clean layout. The SD746 seems interesting with 16-bit conversion, configurable scale and bandwidth for gyro and accels. There's no USB connection so the uploads are via a serial port, I assume.

 

But you may want to update the main board sooner rather than later to an 100MHz+ 32-bit ARM processor (Cortex-M3 and beyond). The 8-bit ATMega is becoming a bit, well, outdated.

Comment by Alexander on September 17, 2011 at 2:10pm

Patrick, thanks for the compliment, indeed there is no USB converter on my boards, i did this on purpose. Now i can use this uart for ohter things like for instance osd. And THE other big reasion is that i didn't want to have stuff on my boards that are not being used during flight but can bring a risc of failor during flight.
For me connecting a ftdi cable with jst connector to the board is the Same as connecting a USB plug directly.
Your right on the 8bit mcu, this is why i can easily swap the main board in the future for a higher performance board

Comment by Farooq Niaz on September 17, 2011 at 2:12pm

8 + 2 Servo outputs means we can have octo with camera Stabiliztion ?

Comment by Andre Lochner on September 17, 2011 at 2:30pm

Very nicely done ! How easy was it to source components ? I live in SA and here it is extremely difficult to source components unless you order large quantities, and you have to wait a long time. 

Comment by Alexander on September 17, 2011 at 2:39pm

farooq, that is exactly what i had in mint. I have a Octo with mikrokopter electronics that I want to replace with this autopilot in the future. So having two extra servo outputs is always useful...but first is the axn floater that will get this board between the receiver and the servos :-)

Comment by Michael Pursifull on September 17, 2011 at 2:39pm

I see a number of well thought out concepts here, perhaps lessons learned from working with ArduPilotMega/IMU?

What do you plan to do as far as software? Are you thinking of producing these boards, or of publishing the layout for others to make?

Comment by Alexander on September 17, 2011 at 2:49pm

Andre, due to my job it's easy to get all the necessary components, especially I'm in close contact and do direct business with Atmel. But you can buy all the components from Farnell, Digikey and for the gyro you can buy them from a German distributer MSC or directly from sensor dynamics in the quantity you want. There are no really special components on these boards...

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