PaparazziUAV project - control more servos

 
 Hi, 
 
 My name is Ivan, I have an interest in  buinding RC
 planes,  especially EDF jets. 
 On this type of jets I typically have many control surfaces
 you need to manage plus I need to manage thrust vectoring as
 well. 
 
 So typically I have many servos to manage (10+) with a
 custom mixes from typical three control inputs (ailerons,
 elevator, rudder).       
 
 My intention is to build an on-board mixer which can take
 these inputs from a receiver and  generate a feed for
 multiple servos.   
 
 I have been researcing what kind of hardware I can use for
 that and your Lisa/S looks fantastic - small, lightweight
 and expandable in case
 I want to put more functions on it.   
 
 
 However it only has a limited number of servos that it can
 control. 
 
 
 I wonder if it can be extended to control more servos using
 an idea descrbed here http://rcarduino.blogspot.com.au/2012/10/arduino-serial-servos-20-servos-4-pins.html
 
 I would presume if I  take four of Lisa's output pins
 to manage 2*4017 chips and add a relative small piece of
 code to the PaparazziUAV project to control these pins
 accordingly then Lisa could manage up to 20 servos. 
 
 
 Could you kindly have a look to the URL above and assess the
 idea?
 Is that doable or there would be issues?
 Where custom mixes can be configured?
Could you please suggest what code blocks need to be written?
 
I could try to develop them then and with your guidance add
 to your project.   
 
 Hope to hear from you soon.
 
 Thank you and best regads, 
 Ivan
 

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Hi,
i think there are many  ways to a solution:

1 Cascade the 5-stage Johnson 4017b counter as described in the data
sheet page 8  HEF4017B MSI 5-stage Johnson counter. You need a
additional and gate like
    the   4081. This chip  has  four. (look  here aso
http://www.dieelektronikerseite.de/Elements/4017%20-%20Der%20besondere%20Zaehler.htm.
    This solution may cause wrong pulses for one period of 40ms.
    Conneting the reset of the secound 4017b to the reset input of the
first on the paparazzi autopilot  may solve this problem.
    You can also use a second free pin of the autopilot like the twog to
reset the second counter.
    An disadvantage of the cascade solution is a  doubled time period to
40 ms. This may cause problems with the  servos.

2 Use a additional counter to separate pins (reset, Impulse). With this
solution you can generate a standard rate of 20 ms for all servos outputs.

3 For STM32 autopilots use 2 normal servo outputs for 2 4017 counters

4 Use the PCA 9685 with 16 outputs like this pcb  
https://www.adafruit.com/product/815 .
    You can cascade the pca9685 to get 32 outputs. This soulution will
work with all paparazzi autopilots.


All this solutions need software changes. This may need same time to
learn  the paparazzi software structures.

Regads

Heinrich







Am 10.10.2016 08:28, schrieb Ivan Fedorov:

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Hi Chris,  

That would be great if you can share it, thank you!
Could you please send the code to  me by email?

Kind Regards,
Ivan


--------------------------------------------
On Thu, 3/11/16, hendrixgr . <[hidden email]> wrote:

 Subject: Re: [Paparazzi-devel] PaparazziUAV project - control more servos
 To: "Paparazzi UAV devel list" <[hidden email]>
 Received: Thursday, 3 November, 2016, 3:27 PM
 
 Hi.
 I have the
 software ready and tested for the PCA9685 if you need it.
 Chris
 
 
 On Sat,
 Oct 29, 2016 at 3:52 PM, Prof. Dr.-Ing. Heinrich Warmers
 <[hidden email]>
 wrote:
 Hi,
 
 i think there are many  ways to a solution:
 
 
 
 1 Cascade the 5-stage Johnson 4017b counter as described in
 the data sheet page 8  HEF4017B MSI 5-stage Johnson
 counter. You need a additional and gate like
 
    the   4081. This chip  has  four. (look  here aso
 http://www.dieelektronikerseit
 e.de/Elements/4017%20-%20Der%2
 0besondere%20Zaehler.htm.
 
    This solution may cause wrong pulses for one period of
 40ms.
 
    Conneting the reset of the secound 4017b to the reset
 input of the first on the paparazzi autopilot  may solve
 this problem.
 
    You can also use a second free pin of the autopilot
 like the twog to reset the second counter.
 
    An disadvantage of the cascade solution is a  doubled
 time period to 40 ms. This may cause problems with the 
 servos.
 
 
 
 2 Use a additional counter to separate pins (reset,
 Impulse). With this solution you can generate a standard
 rate of 20 ms for all servos outputs.
 
 
 
 3 For STM32 autopilots use 2 normal servo outputs for 2 4017
 counters
 
 
 
 4 Use the PCA 9685 with 16 outputs like this pcb  https://www.adafruit.com/produ
 ct/815 .
 
    You can cascade the pca9685 to get 32 outputs. This
 soulution will work with all paparazzi autopilots.
 
 
 
 
 
 All this solutions need software changes. This may need same
 time to learn  the paparazzi software structures.
 
 
 
 Regads
 
 
 
 Heinrich
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Am 10.10.2016 08:28, schrieb Ivan Fedorov:
 
 
 
 
   Hi,
 
   My name is Ivan, I have an interest in  buinding RC
 
   planes,  especially EDF jets.   On this type of jets I
 typically have many control surfaces
 
   you need to manage plus I need to manage thrust vectoring
 as
 
   well.
 
   So typically I have many servos to manage (10+) with a
 
   custom mixes from typical three control inputs
 (ailerons,
 
   elevator, rudder).       
 
   My intention is to build an on-board mixer which can
 take
 
   these inputs from a receiver and  generate a feed for
 
   multiple servos.   
 
   I have been researcing what kind of hardware I can use
 for
 
   that and your Lisa/S looks fantastic - small,
 lightweight
 
   and expandable in case
 
   I want to put more functions on it.   
 
 
 
   However it only has a limited number of servos that it
 can
 
   control.
 
 
 
   I wonder if it can be extended to control more servos
 using
 
   an idea descrbed here http://rcarduino.blogspot.com.
 au/2012/10/arduino-serial-serv
 os-20-servos-4-pins.html
 
 
 
   I would presume if I  take four of Lisa's output
 pins
 
   to manage 2*4017 chips and add a relative small piece
 of
 
   code to the PaparazziUAV project to control these pins
 
   accordingly then Lisa could manage up to 20 servos.
 
 
 
   Could you kindly have a look to the URL above and assess
 the
 
   idea?
 
   Is that doable or there would be issues?
 
   Where custom mixes can be configured?
 
 Could you please suggest what code blocks need to be
 written?
 
 
 
 I could try to develop them then and with your guidance
 add
 
   to your project.   
 
   Hope to hear from you soon.
 
 
 
   Thank you and best regads,   Ivan
 
 
 
 
 
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