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Old Apr 23, 2013, 03:09 PM
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evvaldis's Avatar
Lithuania
Joined Jan 2007
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Sorry for big delays, I have lots of other things to do at this time.

I have redesigned circuit and PCB.
Added few things:
*YAW axis
*USART1 for programming over bootloader with external ft232
*USART4 and Mini USB connector for communication
*additional standard i2c 24C02 EEPROM
*reverse polarity protection
*Aux1.....Aux5 inputs/outputs
*mounting holes

Circuit:
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Old Apr 23, 2013, 03:51 PM
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Lithuania
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And here is messy but working source code for 3axis
No GUI, no RC control on this version...But it will be added in future versions
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Old Apr 23, 2013, 03:52 PM
Baris ALP
Joined Dec 2005
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Nice work evvaldis.
I have a question. Why did you use 2 input for 2 fet (pitchA and pitchAN2)?
Is not it possible? If you use the P channel mosfet driver(maybe bss84) instead of bss123 for pitchA and pitchAN together same input.
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Old Apr 23, 2013, 04:12 PM
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Quote:
Originally Posted by hd27 View Post
Nice work evvaldis.
I have a question. Why did you use 2 input for 2 fet (pitchA and pitchAN2)?
Is not it possible? If you use the P channel mosfet driver(maybe bss84) instead of bss123 for pitchA and pitchAN together same input.
Because of "dead time". One power mosfet should be fully OFF before another goes ON, otherwise for a short period of time they will be both ON and then.. BOOM...
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Old Apr 23, 2013, 04:22 PM
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Germantown, MD, US
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Awesome work. Looks really great.

Thanks

Thanh
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Old Apr 23, 2013, 04:28 PM
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Originally Posted by thanhTran View Post
Awesome work. Looks really great.

Thanks

Thanh
What do you fly Anh Thanh?
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Old Apr 23, 2013, 06:52 PM
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Chile, Santiago Metropolitan Region, Stgo
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do you have any empty PCB? i would be glad to be a tester
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Old Apr 23, 2013, 07:52 PM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
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Originally Posted by Askyvision View Post
What do you fly Anh Thanh?
Hi ASkyVision
Just a homemade quadcopter with a diy controller

Thanks

Thanh
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Old Apr 24, 2013, 07:15 PM
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Portland, OR, USA
Joined Mar 2010
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Looks great Evvaldis. I have many questions!
Are you doing this all on your own, or do you have help?
What are the largest motors you can use with that bss123 mosfet?
How fast are you reading the IMU data?
How are you combining Gyro and Acc?
Do you have drift without a mag sensor?
How many steps do you have to the motors?
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Old Apr 24, 2013, 07:53 PM
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Why don't you look at the sores, all those questions are answered.
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Old Apr 24, 2013, 08:11 PM
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I dug around a little in the source, but I'm far from an expert.

Looks like he's using 90 values for the sin LUT, I'm not sure if I understand how it works, but I think that means he can get 90 positions for the motors, so 4 degrees per step?

It also looks like he's not using a mag sensor, so I'm curious about pan drift.

Finally, I think he's polling the gyro and acc at 50hz, but not sure how fast the motors are being updated.

I also dug around in the Naze32 code, but I have a lot to learn about 'real' microcontroller programming, so I'm still pretty lost.
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Old Apr 24, 2013, 08:27 PM
That tree again!!!!
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Quote:
Originally Posted by Tom Frisch View Post
What are the largest motors you can use with that bss123 mosfet?
bss123 FET doesn't drive the motors. The IRF7343 FETs drive the motors. they can drive up to 3.4A
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Old Apr 24, 2013, 09:22 PM
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So how do these "modified" brushless motors work? Do they work like stepper motor (which run in step) or do they still work like regular brushless motors?

Thanks
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Old Apr 24, 2013, 09:27 PM
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stepper
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Old Apr 24, 2013, 09:39 PM
That tree again!!!!
thanhTran's Avatar
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Thanks for the response TimeCop.
I'm amazed at how steady the camera is with this technology. W onder who came up with this idea first
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