EvvGC 3/2axis Brushless Gimbal Controller (Open Source) - Page 2 - RC Groups
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Apr 23, 2013, 04:09 PM
Registered User
evvaldis's Avatar
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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Apr 23, 2013, 04:51 PM
Registered User
evvaldis's Avatar
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
Apr 23, 2013, 04:52 PM
Baris ALP
hd27's Avatar
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.
Apr 23, 2013, 05:12 PM
Registered User
evvaldis's Avatar
Quote:
Originally Posted by hd27
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...
Apr 23, 2013, 05:22 PM
That tree again!!!!
thanhTran's Avatar
Awesome work. Looks really great.

Thanks

Thanh
Apr 23, 2013, 05:28 PM
Albuquerque USA
Quote:
Originally Posted by thanhTran
Awesome work. Looks really great.

Thanks

Thanh
What do you fly Anh Thanh?
Apr 23, 2013, 07:52 PM
Registered User
do you have any empty PCB? i would be glad to be a tester
Apr 23, 2013, 08:52 PM
That tree again!!!!
thanhTran's Avatar
Quote:
Originally Posted by Askyvision
What do you fly Anh Thanh?
Hi ASkyVision
Just a homemade quadcopter with a diy controller

Thanks

Thanh
Apr 24, 2013, 08:15 PM
Registered User
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?
Apr 24, 2013, 08:53 PM
Suspended Account
Why don't you look at the sores, all those questions are answered.
Apr 24, 2013, 09:11 PM
Registered User
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.
Apr 24, 2013, 09:27 PM
That tree again!!!!
thanhTran's Avatar
Quote:
Originally Posted by Tom Frisch
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
Apr 24, 2013, 10:22 PM
That tree again!!!!
thanhTran's Avatar
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
Apr 24, 2013, 10:27 PM
Suspended Account
stepper
Apr 24, 2013, 10:39 PM
That tree again!!!!
thanhTran's Avatar
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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