[islandlabs] Have RC transmitter and receiver

Jonathan Dahan jonathan
Wed May 8 11:29:08 EDT 2013


Is the code up anywhere online so those of us who want to learn and are
remote can take a gander?


On Mon, May 6, 2013 at 2:56 PM, Jim Marinis <jmarinis at mjmonline.com> wrote:

> I'm looking into changing the number of samples per update.  I've seen
> references to the ADXL345 being sampled at a rate of 100hz, so I'll need to
> do a little investigating to see what we can actually get.
>
> - Jim
>
>
> On 5/6/2013 2:33 PM, Burns, William wrote:
>
>> Futaba "Skysport" 6H FP-6VH
>> 6 channel 4 servo
>> FM Digital Proportional Radio Control System
>>
>> ----
>>
>> FYI:
>> Basics of PID control:
>> 3 terms:
>> 1) Proportional
>> 2) Integral
>> 3) Derivative
>>
>> What we have now is Proportional. The further the copter is from "true",
>> the more power the copter applies to correcting that.
>>
>> note: The "Integral" and "Derivative" terms refer to the mathematical
>> operations.
>> (ignoring that for now)
>>
>> The integral term compensates for "long term" difficulties w/ a
>> proportional response.
>> example: If the center of gravity of the copter is mismatched/offset from
>> the center of thrust, the copter will list to one side until the
>> proportional response balances that out.
>> The copter will become "stable", but not be pointed straight up.
>>
>> The integral term "notices" that long-term tilt, and then compensates,
>> effectively/gradually moving the derivative function's idea of where "up"
>> is until the copter truly points upwards. (as-per accelerometer data)
>>
>> The derivative term is intended to reduce oscillations in the system.
>> It takes the speed of rotation into effect, effectively acting as a
>> "brake" if the copter is "turning" upright too quickly, and likely to
>> overshoot it's target.
>>
>> The integral term is often not used in motor control applications. (if
>> our center of mass isn't off, maybe we don't need it?)
>>
>> The derivative term is is often not used where there are random
>> measurement errors because it then introduces erratic responses.
>> Copter vibrations introduce these random errors...
>>
>> Filtering data may help remove these erratic error responses but... We're
>> only getting 20 measurements per second?
>> At that rate, averaging the last 5 measurements will get us a 1/8 to 1/4
>> second lag in our attitude/position reports.
>>
>> That lag may be too much and cause oscillations in the quadcopter
>> attitude.
>> It would be nice to be able to increase the data-rate from the
>> accellerometer.
>>
>>
>> -Bill
>>
>> http://www.power-eetimes.com/**en/the-basics-of-doing-pid-**
>> design-part-1-classical-**control-theory.html?cmp_id=71&**
>> news_id=222901382<http://www.power-eetimes.com/en/the-basics-of-doing-pid-design-part-1-classical-control-theory.html?cmp_id=71&news_id=222901382>
>>
>> http://hyperphysics.phy-astr.**gsu.edu/hbase/math/derint.html<http://hyperphysics.phy-astr.gsu.edu/hbase/math/derint.html>
>>
>> ______________________________**__________
>> From: list-bounces at freeculture.org [list-bounces at freeculture.org] on
>> behalf of Jim Marinis [jmarinis at mjmonline.com]
>> Sent: Monday, May 06, 2013 1:43 PM
>> To: list at freeculture.org
>> Subject: Re: [islandlabs] Have RC transmitter and receiver
>>
>> Sounds like doing some real damage is in the not too distant future
>> (your leg not withstanding).
>>
>> Which model of receiver/transmitter do you have?  I can take a look
>> before Wednesday so perhaps we can give it a go.
>>
>> - Jim
>>
>> On 5/6/2013 9:21 AM, Burns, William wrote:
>>
>>> I Have an RC transmitter and receiver.
>>>
>>> It can control up to 6 servos.
>>>
>>> Not sure how to interface that to an arduino.
>>>
>>>
>>>
>>> Also: ...
>>>
>>>
>>>
>>> Quadshot: quadcopter/flying wing: transition robotics
>>> http://www.youtube.com/watch?**v=IK_-yTrwNtU<http://www.youtube.com/watch?v=IK_-yTrwNtU>
>>>
>>>
>>>
>>> Space Glider - FPV to Space and Back!
>>> http://www.youtube.com/watch?**v=rpBnurznFio<http://www.youtube.com/watch?v=rpBnurznFio>
>>>
>>>
>>>
>>> Flite Test - FPV Space Glider
>>> http://www.youtube.com/watch?**v=DQMi6Jk38g0&t=3m20s<http://www.youtube.com/watch?v=DQMi6Jk38g0&t=3m20s>
>>>
>>>
>>>
>>> How to Setup FPV w/ GoPro HD, HobbyKing 5.8GHz Transmitter/Receiver fo
>>> http://www.youtube.com/watch?**v=UKMQhWZtNRg<http://www.youtube.com/watch?v=UKMQhWZtNRg>
>>>
>>>
>>>
>>> FPV Ground Station - REVIEW
>>> http://www.youtube.com/watch?**v=RG76qShdKuU<http://www.youtube.com/watch?v=RG76qShdKuU>
>>>
>>>
>>> ______________________________**_________________
>>> List mailing list
>>> List at freeculture.org
>>> http://lists.freeculture.org/**mailman/listinfo/list<http://lists.freeculture.org/mailman/listinfo/list>
>>>
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>> ______________________________**_________________
>> List mailing list
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>
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