how do i (re-)program my digital servo ?

[Michael Redecke]

hello out there ! I am using a digital servo (S-54751 HB digital), but
i must extend the "action radius" of this servo. at this moment it is
about 150 degrees, but i need 180 degrees. i am controlling this servo
via an atmel microprocessor at 300 hz, but making the controling
impulses longer simply stops the servo at a specific endpoint.
so i think i must try to reprogram it. but so far i could not find any
datasheet concerning my servo, and google.com could not report any
webpage with informations concerning how to do that. perhaps every
manufacturer has its own method...

can anyone help me ?

michael from germany

[Carl Farrington]

Michael Redecke wrote:
> hello out there ! I am using a digital servo (S-54751 HB digital), but
> i must extend the "action radius" of this servo. at this moment it is
> about 150 degrees, but i need 180 degrees. i am controlling this servo
> via an atmel microprocessor at 300 hz, but making the controling
> impulses longer simply stops the servo at a specific endpoint.
> so i think i must try to reprogram it. but so far i could not find any
> datasheet concerning my servo, and google.com could not report any
> webpage with informations concerning how to do that. perhaps every
> manufacturer has its own method...
>
> can anyone help me ?
>
> michael from germany

I'm no expert but I've never heard of reprogramming any other type of servo
EXCEPT for Hitec (the one you have!).

There is a Hitec Servo Programmer thingymagig out there that does probably
what you want. Try hitec homepage at:
http://www.hitecrcd.com/

[Carl Farrington]

Michael Redecke wrote:
> hello out there ! I am using a digital servo (S-54751 HB digital), but
> i must extend the "action radius" of this servo. at this moment it is
> about 150 degrees, but i need 180 degrees. i am controlling this servo
> via an atmel microprocessor at 300 hz, but making the controling
> impulses longer simply stops the servo at a specific endpoint.
> so i think i must try to reprogram it. but so far i could not find any
> datasheet concerning my servo, and google.com could not report any
> webpage with informations concerning how to do that. perhaps every
> manufacturer has its own method...
>
> can anyone help me ?
>
> michael from germany

Q. How do I program my Hitec digital servo?
Using Hitec's proprietary programmer and servo tester device, model HFP-10,
Hitec digital servos can be programmed for, direction of rotation, center
and end points, failsafe option, speed and dead bandwidth adjustment. This
is great for matching sets of servos for deadband width, center and end
points in giant scale aircraft applications and for reversing a digital
servo when two or more are used on a "Y" harness.
For more information on this device, check out: Digital Servo Programer FAQs
which is at:

http://www.hitecrcd.com/Support/Faqs/faq_hfp10.htm

[Carl Farrington]

Michael Redecke wrote:
> hello out there ! I am using a digital servo (S-54751 HB digital), but
> i must extend the "action radius" of this servo. at this moment it is
> about 150 degrees, but i need 180 degrees. i am controlling this servo
> via an atmel microprocessor at 300 hz, but making the controling
> impulses longer simply stops the servo at a specific endpoint.
> so i think i must try to reprogram it. but so far i could not find any
> datasheet concerning my servo, and google.com could not report any
> webpage with informations concerning how to do that. perhaps every
> manufacturer has its own method...
>
> can anyone help me ?
>
> michael from germany

Oh and the maximum you will be able to get is 172.5 degrees. Sorry. The
Hitec programmer will not let you go beyond 15% of the original endpoint.
15% of 150 degrees is 22.5 more giving 172.5% max.
If you can find out the technicalities of how the Programmer works, you
could probably override this since the FAQ suggests this is a safety measure
of the programmer to avoid attempts to drive the servo past its mechanical
limits.

[Michael]

"Carl Farrington" <carl@000compsup000.net> wrote in message news:<b9rs29$2o8$1$8300dec7@news.demon.co.uk>...

>
> Oh and the maximum you will be able to get is 172.5 degrees.
....

Thank You Carl for Your information !
Well i will try to get one of these programers here. and i have a
transient recorder on my table. maybe i will be able to follow the
"conversation" between programer and servo. then i will post a message
here if it was possible.
but i am not sure that my servo is a hitec. www.conrad.de sells it
here under their own brand name "conrad" at 39,95 € (+/- 35 US
Dollars).
by the way: this cheap digital servo works much more precise than my
analog servo. it always returns exactly at specific programmable
points, my analog one was not so recise.
michael

[Michael Redecke]

"Carl Farrington" <carl@000compsup000.net> wrote in message news:<b9rqv6$sv3$1$8300dec7@news.demon.co.uk>...
> Michael Redecke wrote:
> > hello out there ! I am using a digital servo (S-54751 HB digital), but
> > i must extend the "action radius" of this servo. at this moment it is
> > about 150 degrees, but i need 180 degrees. i am controlling this servo
> > via an atmel microprocessor at 300 hz, but making the controling
> > impulses longer simply stops the servo at a specific endpoint.
> > so i think i must try to reprogram it. but so far i could not find any
> > datasheet concerning my servo, and google.com could not report any
> > webpage with informations concerning how to do that. perhaps every
> > manufacturer has its own method...
> >
> > can anyone help me ?
> >
> > michael from germany
>
> I'm no expert but I've never heard of reprogramming any other type of servo
> EXCEPT for Hitec (the one you have!).
>
> There is a Hitec Servo Programmer thingymagig out there that does probably
> what you want. Try hitec homepage at:
> http://www.hitecrcd.com/

Hello Carl ! Futaba´s FS 250 are also programmable. The software You
need in this case is "CAMI 2000", available here in Germany in june.
Its a software for free they told me at www.robbe.de...
michael

[Carl Farrington]

Michael Redecke wrote:
> "Carl Farrington" <carl@000compsup000.net> wrote in message
> news:<b9rqv6$sv3$1$8300dec7@news.demon.co.uk>...
>> Michael Redecke wrote:
>>> hello out there ! I am using a digital servo (S-54751 HB digital),
>>> but
>>> i must extend the "action radius" of this servo. at this moment it
>>> is
>>> about 150 degrees, but i need 180 degrees. i am controlling this
>>> servo
>>> via an atmel microprocessor at 300 hz, but making the controling
>>> impulses longer simply stops the servo at a specific endpoint.
>>> so i think i must try to reprogram it. but so far i could not find
>>> any
>>> datasheet concerning my servo, and google.com could not report any
>>> webpage with informations concerning how to do that. perhaps every
>>> manufacturer has its own method...
>>>
>>> can anyone help me ?
>>>
>>> michael from germany
>>
>> I'm no expert but I've never heard of reprogramming any other type
>> of servo
>> EXCEPT for Hitec (the one you have!).
>>
>> There is a Hitec Servo Programmer thingymagig out there that does
>> probably
>> what you want. Try hitec homepage at:
>> http://www.hitecrcd.com/
>
> Hello Carl ! Futaba´s FS 250 are also programmable. The software You
> need in this case is "CAMI 2000", available here in Germany in june.
> Its a software for free they told me at www.robbe.de...
> michael

I'll remember that, thanks! I've never heard of an FS 250 mind, but I'll
keep my eyes peeled :)

PS I'm most certain your Servo is a rebadged Hitec. Many Hitec servos end in
'HB' and Hitec market one with almost the identical model number to yours,
so should be no worries.

[Michael Redecke]

> > "Carl Farrington" <carl@000compsup000.net> wrote in message
> > news:<b9rqv6$sv3$1$8300dec7@news.demon.co.uk>...
>
> I'll remember that, thanks! I've never heard of an FS 250 mind, but I'll
> keep my eyes peeled :)


FUTABA FS 250 S or FS 250 T

> PS I'm most certain your Servo is a rebadged Hitec. Many Hitec servos end in
> 'HB' and Hitec market one with almost the identical model number to yours,
> so should be no worries.

Yes, I think also.