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Old Aug 30, 2013, 10:48 AM
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FlyingW's Avatar
Long Valley, NJ, USA
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Question
Nano and RFU for 3-Axis Heli Gyro System

XPS,

I am considering purchasing a Thunder Tiger 450-class heli that comes with an ACE GT5.1 3-Axis gyro system. The manual for the GT5.1 gyro says that it will accept inputs from a regular receiver with discrete cabling for each servo. The manual also says that the gyro will accept a PPM or S-Bus stream through a single lead. The attached diagram is from the GT5.1 manual; here are my questions:

1. Would the Nano-II go to the same port as the S-Bus Rx shown circled in the diagram?

I've read that the Nano-II can talk S-Bus, PPM, and "Xtreme" protocols.

2. Which of the three protocols above would you recommend for this application?

Please advise. Thanks,

Paul
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Last edited by FlyingW; Jan 17, 2014 at 07:47 PM. Reason: Added RFU
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Old Aug 30, 2013, 10:56 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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The Nano II can output PPM or Xtreme, not SBUS. So, you will need to use PPM for this setup.
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Old Aug 30, 2013, 01:39 PM
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FlyingW's Avatar
Long Valley, NJ, USA
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Thanks Jim.

Beside less cabling from the Rx to the gyro, is there any electronic or signal advantage to using a serial PPM stream?

Paul
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Last edited by FlyingW; Aug 30, 2013 at 03:39 PM.
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Old Aug 30, 2013, 11:21 PM
Xtreme Power Systems
Lake Havasu, AZ
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Nope, no advantage other than a cleaner installation.... but that is a big deal because you can remotely locate the receiver.
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Old Aug 30, 2013, 11:23 PM
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FlyingW's Avatar
Long Valley, NJ, USA
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Thanks Jim,

Paul
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Old Sep 02, 2013, 05:59 PM
PGR
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United States, CA, Costa Mesa
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Quote:
Originally Posted by JimDrew View Post
Nope, no advantage other than a cleaner installation....
There's a definite advantage to PPM mode if the gyro can use more than 6 channel inputs. In PWM (standard) mode the Nano is limited to 6 channels but in PPM mode you're only limited by the number of channels in the TX.

I'm controlling 8 channels on a multirotor with a Nano and a Futaba 9CAPS, but the single-wire connection 'tween the Nano and gyro is an awfully nice bonus.

Pete
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Old Sep 02, 2013, 06:10 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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Awww... true! I forgot about extending the number of channels too!
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Old Sep 30, 2013, 10:54 PM
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FlyingW's Avatar
Long Valley, NJ, USA
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Still investigating new 3-axis gyros for flybarless heli operation.

I think I was wrong about the ACE GT5.1 and its ability to accept a serial PPM stream - it can take the individual discrete receiver outputs from a PPM receiver using a cleverly reduced set of cables, but it cannot take a serial PPM stream. It can accept a serial SBUS stream, and it can also use Spektrum satellites.

Can folks here kindly identify a flybarless gyro product that will accept a serial PPM stream from the Nano-II? I'd like to see how the vendor describes the connection.

Thanks,

Paul
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Old Oct 01, 2013, 09:30 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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BeastX can accept CPPM (composite PPM), SBUS, Spektrum satellite, or standard receiver channel inputs.
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Old Oct 01, 2013, 11:15 AM
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FlyingW's Avatar
Long Valley, NJ, USA
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Thanks Jim. Very interesting - they call it a "composite signal receiver." Now I know one way to ask the gyro vendors the question of whether they support the feature.

Paul
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Old Oct 22, 2013, 07:28 PM
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Long Valley, NJ, USA
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Another question concerning the composite PPM signal available from the Nano:

Does the Mikado Mini-VBar support the Nano's composite PPM signal?

I'm waiting to be approved for the Mikado VBar Forum, but in the meantime I thought I'd ask here.

Thanks,

Paul
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Old Oct 22, 2013, 09:35 PM
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A tad off topic , but BeastX is lots easier to setup, no computer needed for setup OR any adjustments....

And probably only 1% of pilots would notice any difference in flight characteristics.......
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Old Oct 22, 2013, 10:45 PM
Xtreme Power Systems
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PPM is PPM, so it works with any device that supports is PPM, including the Vbar.
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Old Oct 23, 2013, 08:30 PM
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FlyingW's Avatar
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A suggestion I got in the Mini-VBar forum was to try the single line PPM setup and see if there were errors in the log after giving all of the possible stick and switch movements. I suppose that's reasonable.

Say the single line PPM works fine, and I have it wired as the diagram below. The ESC's internal BEC feeds power to the Mini-VBar through the RX-B connection. Both RX-B and RX-C are on the Mini-VBar's power bus.

Can the Nano-II be powered through its connection to RX-C?

Thanks again,

Paul
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Old Oct 23, 2013, 11:07 PM
Xtreme Power Systems
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Yes.
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