|Feb 24, 2008, 05:59 PM|
how about this?
hao = ok/good (romanized mandarin)
bu = no/not
hao bu hao = ok, not ok
but if used in conversation it is informal way to ask "how are you". something like ni hao bu hao (pronounced nee how boo how). more common is ni hao ma (pronounced nee how mah). I'm not Chinese. I'm trying to learn Mandarin. So, I could be all wrong...
so, I found this setup for the optic 6 on Ebay.
I don't need servo's, so I think this might fit the setup being described to me.
If someone can tell me if this an ok setup, I'll get it.
|Feb 24, 2008, 08:01 PM|
United States, TX, San Antonio
Joined Feb 2007
Good price for TX, Spectra and 8 channel RX. I would get it. Hu. Aloha!
Jim (Hawaii resident USAF duty 2001-2003)
|Mar 16, 2008, 05:30 PM|
Are PID loops advantageous over FLC loops for this purpose? It seems that I haven't read anything about FLC loops being used yet in quadrocopters. Also, from your perspective, is there any advantage to utilizing faster processors that the Atmel family microcontrollers? I know AcendTec (X-BL-UFO) is going to be releasing a gyro board (OpenSourcePilot/FunPilot) based on a 60MHz, 32-bit ARM7. Up until then everything seems to have worked fine on 8-20MHz, 8-bit chips. With the additional processing power, is there any opportunity for more complex control loops that provide better stability? Or is stability for this application more related to the quality of the piezo elements and their resolution/quality?
Nice work so far. It's inspiring to see someone's work unfold and to learn how it's all put together.
|Mar 16, 2008, 05:38 PM|
Canada, BC, Salmon Arm
Joined Feb 2007
Well judging from your Avatar, well be OK just as long as I don't steal your wave.
Good luck with the Quad, look forward to some flying videos.
|Sep 23, 2009, 01:48 AM|
Joined Jun 2009
sorry for digging up an old thread..
I'm also in the middle of building such a Quadrotor. I have a question about PWM Signals.
I decided to use PIC18F4431 to generate four PWM signals at 50MHz. In order to drive the speed controllers(I'm using TowerPro 25A s) we have to provide 5% - 10% duty cycle. Assuming that I'm using 40MHz crystal, the maximum resolution that I can go is around 150 steps.
(Fosc=40MHz, PreScale=64, Fpwm=50Hz --> PeriodReg = 3124
0% to 100% = 0 - 3124
5% to 10% = 156.2 - 312.4 (Zero rpm to Max rpm)
312-156 = 156 steps )
Means that I will only have around 150 different speeds of a motor which I think is not at all enough.
So I thought of writing a software PWM rather than using the hardware available. But even using a software PWM,it will be very hard to achieve 1000 steps. (Because single PIC have generate 4 PWM signals)
So now I'm ended up with the idea of using four small PICs just to generate the desired PWM signals. But I haven't seen any such design..
Could you please tell me what I have done wrong here?
How do Mk and other products generate PWM signals?
Thanks in advance..
|Sep 23, 2009, 08:33 AM|
Well, for one thing, I have never heard of an ESC that has more than 256 steps, so there is no real reason to output 1000.
The Quaduino only uses a little bit over 100 steps, and it flies very well.
You might want to look at outputting at a higher frequency though. Helps cut down on latency.
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