RunRyder RC Helicopter Topic - Serial Bus Servos

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Main Discussion > Serial Bus Servos

Aox
Senior Heliman
Location: Laguna Beach, CA

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http://www.rctech.com.tw/rctnews/in...oad=read&id=126

You guys see these new Futaba servos yet? Serial Bus. You'll be able to chain servos together on a single receiver port, and channels will be programmed per servo on the bus, and not per physical connection.

Very interesting.

-Aox

Synergy N9~/~Trex250-450-600N~/~Logo 500 3D~/~Rave 3D~/~Mini-Titan A109K2
AMA #902257 - OCMA

11-19-2009 02:58 AM

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J2M
Senior Heliman
Location: UK

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Thanks for posting this. Very interesting idea which, amongst other things, could simplify wiring on our helis. I notice that the receiver has 6 conventional outputs as well as the S.Bus so it looks like this is intended to complement/extend existing setups rather than replace them

11-19-2009 09:32 AM

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midwestpilot
Elite Veteran
Location: Crystal Lake, IL

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isnt this the same thing as

the JR Match box?

I am in an airport and could not hear the audio... but it looks like a match box

edit... after watching again...still with no audio... I am not sure what i am looking at...

it is my birthday tomorrow and i am rather old

In life there is no spacebar!

Rich Erikson AMA 6175

11-19-2009 02:10 PM

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halley
Heliman
Location: Manchester, CT, USA

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Serial bus servos are very popular in robotics. There are a number of expensive but small humanoid robots that basically consist of about twenty servos and a microcontroller. When you have multiple limbs like a "pelvis, knee, ankle, toe" assembly, it's much more convenient to wire them in a serial bus than to have individual wiring to each stage of the limb.

[ e d @ h a l l e y . c c ]

11-19-2009 02:36 PM

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groran
Senior Heliman
Location: Carriere,MS.

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Yup now that's cool

I love the RC world, always something new for the gadget geek like myself to play with and gulp spend money on. How much will these bad boys be?

What goes around comes around Good or bad-Do Good
Randy Lafleur
Futaba 8FG
Xcell Extr

11-19-2009 02:37 PM

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kcordell
Key Veteran
Location: O Fallon, MO

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Looks to me as if this serial bus stuff would work much better with the giant scale guys. Most of them now run 2 servos on elevator, 4 on ailerons, 4 on rudder (have you seen those pull/pull systems with 4 inline servos they are using). I'm not sure how much benefit they would be to standard heli setups. I'm sure the scale guys could use them.

Team Futaba, Miniature Aircraft Pilot, YS Engines, VelTye

11-19-2009 10:14 PM

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devious17
Senior Heliman
Location: Malaysia

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and it costs more than the 14 channel receivers ..... unless I am hard up for space on my heli I think I am going to stick with the conventional until the price is 'real' .

11-20-2009 03:25 AM

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Aox
Senior Heliman
Location: Laguna Beach, CA

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I had seen these before, and the reason I went back and found the link again, is because of another post here in the main forum about servo wiring, and the cleanliness thereof.

Well, I was thinking, theoretically, the application is supposed to be that you chain these servos together, which could give a few more options of wire routing than hanging them all directly off the receiver. Maybe they're going to come out using some sort of "bus cable" logic, that will allow you to run one cable with multiple connectors on it through the frame of the heli. You could cut the servo pigtails down to say, 1-2 inches at the most. Run that one bus cable along the inside of the frame, plug your litte servo pigtails into that, and bam, superclean install.

-Aox

Synergy N9~/~Trex250-450-600N~/~Logo 500 3D~/~Rave 3D~/~Mini-Titan A109K2
AMA #902257 - OCMA

11-20-2009 11:31 AM

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tadawson
Elite Veteran
Location: Lewisville, TX

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Hmmm . . . the potential for a single cable failure to take out the entire airborne system would appear to be a risk that they may have a hard time getting past . . . . .

- Tim

The more I touch electrics, the more I grow to hate them . . . .

11-20-2009 01:04 PM

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GyroFreak
Elite Veteran
Location: Florida ... 28° 52' N 81° 16' W

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Quote
the potential for a single cable failure to take out the entire airborne system would appear to be a risk

But with multiple cables (current systems) a single cable failure on a swash servo is a nonrecoverable failure. So on a CCPM swash you have three times the likelyhood of failure/crash over a single cable system.

Bacteria They're the only culture some have
Growing old is required; growing up is opti

11-20-2009 01:47 PM

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Wingman77
Elite Veteran
Location: Pulaski TN US

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that video might be a little more interesting if it was in english.

11-20-2009 03:28 PM

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Justin Stuart
Elite Veteran
Location: Plano, Texas

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Any new invention that simplifies wiring is good in my book.

MinAir Spectra-G
Trex 450Pro V-bar /Scorpion /JR
Wally Motors//DL Canopies

11-20-2009 05:54 PM

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MutantGarage
Heliman
Location: Texas, USA

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Connectors are the true evil, wires don't fail nearly as often as a connector can pull loose or develop oxidation and open a contact.
Even if there is a single wire from the Rx, each servo still has a plug in addition to the plug on the radio. Unless, you hard wire your servos into a custom made harness. Something to be said for that. Makes repair a pain, but it would be more reliable, eliminating all the connectors.
A bit lighter as well, given no excess wire or connector pins/housings.

11-22-2009 06:41 AM

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GMPheli
Key Veteran
Location: W. Bridgewater, MA USA

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What's the latency though

11-22-2009 03:27 PM

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J2M
Senior Heliman
Location: UK

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Just been looking at the PC interface software for the GY520 and what do I find? Answer, a parameter called "Channel" which is explained thus:

" Channel
Initial value: Rudder=2, Gain=3
Specifies the rudder channel and gain channel numbers connected to the receiver. It is effective at S-Bus connection. "

So, it looks like the GY520 is already S.Bus enabled!!

11-24-2009 02:01 PM

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darkfa8
Elite Veteran
Location: Eatontown, NJ - USA

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if you read the label, the GY520 clearly states that it is S.BUS compliant:

- Dan Goldstein -

11-24-2009 02:30 PM

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spiacro
Senior Heliman
Location: Athens, Greece

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It seems interesting, but i cannot understand what the video guy was talking about.

Spiros

Engine is the HEART of an r/c model, but THE PILOT is it's SOUL.

11-24-2009 02:37 PM

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J2M
Senior Heliman
Location: UK

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darkfa8

Never noticed that! Not even sure my 520 has that label - it's been hidden inside a stratus for months so I'll have to look

11-24-2009 02:51 PM

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Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

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Proably most of the Rx are allready enabled for sbus. The problem are the servos. Im guessing you need to get new servos. The gyro is a nice feature so you can have a singel wire going to the gyro.

Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!

11-24-2009 05:35 PM

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pwood
Key Veteran
Location: Dubai - United Arab Emirates

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Hi guys

It would appear that you would need one wire between your Rx and the gyro 'hub' and then all the servos plug into this hub. Would make wiring nice and neat.

Regards
Paul

11-25-2009 06:19 AM

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Main Discussion > Serial Bus Servos

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