RE: Zhen Hua Radio and FMS really works!!!  
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RE: Zhen Hua Radio and FMS really works!!! - 3/28/2005 12:49:07 AM   
iron1800


 

Posts: 2
Joined: 3/26/2005
From: , KY, USA
Status: offline 		My transmitter looks identical to the one in the pic. Can you give me more detailed instructions as I don't want to destroy my controller. I have basic knowledge of electronics and am good at soldering. Any info would be very helpful. My transmitter is a Walkera 6ch. I can send pics if you need them. My personal e-mail is iron1800@hotmail.com.

Thanks,
iron1800

(in reply to klausflorida)
       Post #: 51

RE: Zhen Hua Radio and FMS really works!!! - 3/28/2005 12:55:37 AM   
rweller


 

Posts: 18
Joined: 2/9/2005
From: Winston-Salem, NC, USA
Status: offline 		To Radioflyer2 - Thanks for the post. I tried it again - but as soon as I turn the Tx on I get the "invalid synch byte" message. I tried with the radio off, since at that point I get "waiting for stream init", but cannot get any apparent Tx input after setting FMS controls to joystick interface with the setting as recommended. I'm waiting for a new cable.

To Oops - I've adjusted the flybar with the weights near the ends. I had put some angle in the paddles, so thanks for the direction to put them flat. (The directions for this Walkera 4 leave a lot to intuition and guesswork). I didn't have much tab left on the plate so my springwire repair didn't last more than one battery life. I'm still using the training gear since I kept dinging the main blades every time I tried to take off in the driveway and the helicopter heeled over. I'm glad to hear you have been able to maintain a hover for a long time - something to shoot for. Thanks!

(in reply to RadioFlyer2)
       Post #: 52

RE: Zhen Hua Radio and FMS really works!!! - 3/28/2005 6:38:01 AM   
oops


 

Posts: 664
Joined: 2/26/2005
From: Perth, AUSTRALIA
Status: offline 		Hi Rweller,

They like to fall over on a smooth power-up... That really sucks... I can't fix that either... I think it's because it's so light and you need a little right roll on the swashplate to stop them shooting to the left (To counter the thrust from the tail rotor).

I usually get to 80% flying thrust, then "jump" the throttle up a few notches... This yanks it off the deck, and into an unstable hover... Sometimes it goes
straight up without a problem, but other times, it goes left or right a bit, and I have to catch it... Usually I get it about 2ft off the ground with that maneuver.

Then I drop down a notch or two to get to hover power. It balloons a bit, and at first, I landed on the down-cycle, but after practice, I managed to get it to hold altitude around 2 to 4 feet after liftoff.

That gets around the roll to the right or roll to the left problem on takeoff. (The 22A doesn't do that at all, so I think it's a Walkera 4 trait)

Once it's up, get it tail in, and get it to hover quick! Make sure there are no walls within 3 metres... They are a bad distraction.

Cut some of the remaining tab from the swashplate before making the spring-wire repair. Mine goes in as far as the bearing (almost touches, and is certainly below it) and is hot-melted in about 1.5mm... Almost in the middle of the plastic...

Hi Iron1800,

You can get signal from the Crystal socket if you like. Anyway, take a photo of the underside (chip side) of the controller. I'll email you so you have a return address.

David





(in reply to rweller)
       Post #: 53

RE: Zhen Hua Radio and FMS really works!!! - 3/29/2005 3:22:46 AM   
rweller


 

Posts: 18
Joined: 2/9/2005
From: Winston-Salem, NC, USA
Status: offline 		To Oops - I finally solved the vibration/oscillation problem. Even though the main blades are identical in size and shape, I experimented with adding some weight (small piece of wire) taped to one of the blades. Believe it or not, I was now able to hold the helicopter while powering it up with almost no vibration. It was then stable enough to lift off and hover a bit without trying to shake itself to pieces. I also marked the middle of the blade tips so I could line them up better, and ran through a couple battery charges with "near the ground" flying (still using the training kit ). Hopefully there won't be a breeze next time and I can get a longer hover under control. (Hard to imagine I could control this enough to fly in the house, though.) Thanks again for all the info.

(in reply to oops)
       Post #: 54

RE: Zhen Hua Radio and FMS really works!!! - 4/22/2005 11:45:16 AM   
coolgti


 

Posts: 4
Joined: 4/5/2005
From: ukn/a, UNITED KINGDOM
Status: offline 		hi did you have to open the transmitter and solder any wires to get the zhen hua to work!

(in reply to Rayan)
       Post #: 55

RE: Zhen Hua Radio and FMS really works!!! - 4/22/2005 3:17:34 PM   
oops


 

Posts: 664
Joined: 2/26/2005
From: Perth, AUSTRALIA
Status: offline 		Hi Coolgti

You only have to open and solder the Zhen Hua 6 channels that come with the Walkera 22a and 35. The Walkera 4 channel works just fine via the serial interface.

Regards
David

(in reply to coolgti)
       Post #: 56

RE: Zhen Hua Radio and FMS really works!!! - 4/22/2005 4:07:08 PM   
jyc



Posts: 95
Joined: 8/24/2004
From: Alexandria, VA, USA
Status: offline 		Hi Iron1800,

What is your progress on trying to get the 6ch Walkera transmitter to sync up with the flight sim? I am in the same situation and the supplied cord (serial version) will not work with PPJoy. Any instructions for your success is appreciated.

James

(in reply to iron1800)
       Post #: 57

RE: Zhen Hua Radio and FMS really works!!! - 4/22/2005 6:50:20 PM   
bluesky123


 

Posts: 371
Joined: 1/8/2002
From: Boulder, CO, USA
Status: offline 		I am not sure if Walkera 6ch is the same transmitter as ESky 6ch, but for the latter there's an off the shelf solution:
www.milehighwings.com
This de-CCPM interface decouples the CCPM-mixed signal and feeds it to the serial port using the regular FMS PIC serial protocol (i.e. FMS and other sims, which support this protocol, can use this interface without any ppjoy-type drivers).

(in reply to jyc)
       Post #: 58

RE: Zhen Hua Radio and FMS really works!!! - 4/23/2005 5:55:04 AM   
oops


 

Posts: 664
Joined: 2/26/2005
From: Perth, AUSTRALIA
Status: offline 		jycbusiness,

Iron1800 succeeded about 2 weeks ago following the mods I posted.
He posted me about some issues but worked through them

The mods are available at: http://blackice.com.au/heli/

This mod is only relevant to the (definate) Walkera 22A and (I think) Walkera 35 transmitters. Other transmitters might work...
(I used the same cable circuit with my Futaba as well... Works fine. Different top plug though).

One thing I will mention - Not everyone who has contacted me has had success, and some people have tried this mod with different controllers with
varying degrees of success. To suceed, you will some reasonable soldering skills and some knowledge of electronics. It's a bit harder than a kit.

One thing we all seem to make mistakes on is the placement of the extra plug... So be careful.

Regards
David


(in reply to bluesky123)
       Post #: 59

RE: Zhen Hua Radio and FMS really works!!! - 4/28/2005 6:55:12 PM   
pischla


 

Posts: 74
Joined: 3/4/2005
From: Hälleforsnäs, SWEDEN
Status: offline 		David,

Do you think the walkera #35 6ch transmitter would work with your modification? I have included a pic of the board you're referring to at http://blackice.com.au/heli/.

Attachments
Click to see fullsize image.
Click for fullsize


< Message edited by pischla -- 4/28/2005 6:58:24 PM >

(in reply to oops)
       Post #: 60

RE: Zhen Hua Radio and FMS really works!!! - 4/29/2005 1:59:55 PM   
oops


 

Posts: 664
Joined: 2/26/2005
From: Perth, AUSTRALIA
Status: offline 		Hi pischla,

I've never seen one of those boards before.

The pad on the right seems kinda suspicious... I'd check to see if it's the correct output.

The output is connected to a set of unused pads like that (one GND nearby) on a few transmitters I have seen.

As I can't test the board I can't say for certain, however I suspect that it would be modifyable also.

Although, if it is a new board, maybe the serial works? Try it out in Hyperterminal at 19200 baud, No Parity, 8 Data bits, 1 stopbit.
See if you see anything. If so, then use the serial.

Can you take a larger picture of front and back and send it to me? If I can see where it enters the crystal, I might be able to spot the correct track.

Regards
David

(in reply to pischla)
       Post #: 61

RE: Zhen Hua Radio and FMS really works!!! - 4/29/2005 3:23:50 PM   
pischla


 

Posts: 74
Joined: 3/4/2005
From: Hälleforsnäs, SWEDEN
Status: offline 		I'll do that tonight. Could I send it to your e-mail? I'll include another pic here where I've drawn the signal to the svhs connector.

Attachments
Click to see fullsize image.
Click for fullsize

(in reply to oops)
       Post #: 62

RE: Zhen Hua Radio and FMS really works!!! - 4/29/2005 11:30:27 PM   
pischla


 

Posts: 74
Joined: 3/4/2005
From: Hälleforsnäs, SWEDEN
Status: offline 		Well, I managed to get some sort of signal from it using your adaptor for the parallell port. I used the svhs connector and got the signal from the pin which I marked red on the previous picture. I loaded ppjoy and configured a "LPT1:PPM interface radio control TX" And then started FMS. Went into analog control and selected joystick interface. When i go into calibration I see the bars hop up and down when I move the sticks like it was an digital control, besides one stick, the fore and aft moves correctly. Maybe it's some timing issue with ppjoy?
How do you set up the software?

(in reply to pischla)
       Post #: 63

RE: Zhen Hua Radio and FMS really works!!! - 4/30/2005 12:50:58 AM   
oops


 

Posts: 664
Joined: 2/26/2005
From: Perth, AUSTRALIA
Status: offline 		Hi Pischla,

It sounds like you're on the right track. If you see full analogue control from any of the signals, you are probably OK. I'm a bit suprised that it seems Digital
in nature, and I'm wondering whether it might be PPJOY seeing a serial input as digital PPM.

However if you are seeing a proportional response (and by that, I mean sensitive to very slight movements of the stick and continuous over the full range) then it's probably the correct output.

PPJOY has an option to map the channels. You probably need to do that.

I had to map mine into X-axis, Throttle, Y-axis and Rudder to work on one PC. I set PPJOY mapping to 4 axis and assigned Axis 1 through to Axis 4 with one of those settings. Then it worked. At first I just set them arbitrarily, but once I could see movement in Joystick setup, I worked out