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Re: [Paparazzi-devel] Does the Lisa/L support ESC controllers for Rotorc
Re: [Paparazzi-devel] Does the Lisa/L support ESC controllers for Rotorcraft?
Sat, 16 Jul 2011 01:21:36 +0200
On Sat, Jul 16, 2011 at 12:23 AM, Piotr Esden-Tempski <address@hidden> wrote:
Nice page, I hope you will get your Aspirin soon! :)
On Jul 15, 2011, at 9:23 AM, Simon Wilks wrote:
> I picked up an XAircraft X650 recently and just finished building it and gave it a first test flight. Very nice :) Here is a brief build log if you are interested: http://sites.google.com/site/paparazziuav
Yes it does. There is a PWM supervision module there.
> I have a Lisa/L board and was planning to adapt the X650 for it. I was initially thinking I would need to at least replace the ESCs with I2C controllers but I was wondering if the Lisa/L (code) supports driving ESC controllers.
We are running all our aircraft on PWM based ESC's. Most china motor controllers will accept higher frequency PWM input then the nominal 50Hz, 200Hz was enough to get a stable Quad and 400Hz makes it nice and smooth. In my opinion I2C is evil, error prone, unreliable and a single point of failure. PWM or PPM is much more robust to EMF. I2C was designed for short connections between components on one single PCB not to run through half a meter of wire. I personally had lot's of headaches associated with I2C in the past.
> I understand one of the problems with ESC is it is too slow but XAircraft seems to have come up with something new that provides 500Hz control. Here is a link to an article on the UltraPWM protocol and the reason they stayed away from I2C: http://www.xaircraft.com/wiki/UltraPWM/en
The only even better solution would be CAN. (lisa/l supports CAN but the only motor controller that has CAN support at the moment is http://open-bldc.org and it is sadly still not production ready, yes it is my fault ... I still did not clone myself to have enough time to finish it :/ )
But enough of the rant. Yes Paparazzi and Lisa/L supports PWM based motor controllers and yes it also supports high frequency PWM. So go for it and use it! :D
Excellent! Thanks for great infos
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