JJRC H8C with nrf24L01 module problem

Hi,
I am new to RC flying and since these quads are so spectacular I wanted to start in this hobby. I bought a JJRC H8C quad and since I wanted a better brushless quad later and a better remote for my JJRC I decided to buy an affordable Devo 7E.
I already had an V911 helicopter as well (since a year or two).

I bought the Devo 7E, installed the Deviation firmware. I desoldered the module from the V911, installed it in the Tx and it works without a problem. Very happy! ([url=http://http://www.hacksmods.com/2013/04/walkera-devo-7e-transmitter-deviationx-flysky-hubsan-mod/]good guide for this mod[/url])

In the mean time I bought a DSM2 reciever van HK, did a benchtest and looks like it works. Very happy again (for my future quad)

Then my nrf24L01 module arrived, I bought NRF24L01+PA+LNA SMA from an ebay shop in Spain. I installed it ( good guide for this ).
First I had some troubles to bind the model. I was pushing the throttle, but nothing happend. Then I tested (a few times) with the -BIND- button and that worked.
Was happy, until I encountered some problems:
- Binding doesn't always work directly, sometimes I have to try several time (5x) to get it binded. Rarely, but it happens, strange characters come on the screen and only once the screen was completely blank. After reset everything is ok again.
- Worser, during flight, the direction sometimes hangs. You fly in a certain direction and you change, but nothing happens, only half a second (wild guess) later. If I fly with the original Tx this problem does not happen.


Are the problems I encounter normal, what might be the cause?

Is there a faster way to bind the V202 protocol then going through the menus and find the BIND button?

I added tx.ini and the model4.ini I use for this quad.

This is an album I created from my solderwork:
flic.kr/s/aHsk7evMDC

DSC_0006 by HaCo81 , on Flickr

My V2x2 quads need to rebind every time. So I assign a menu page, usually the first one (Main Page Config -> Menu 1) to "Model setup". Then from the normal screen I just hold the "Up+" key a couple of seconds and it brings me to the model config page. If you've already used the Bind button there, it will be highlighted, so press "ENT" and you're set.

Weird characters on the screen and loss of control are harder to address. I make sure to keep the voltage on my Devo7e above 4.8v. Also, every time I install a new Deviation version (or when I reinstall) I always reformat the USB drive before copying over the files (always backup your models to your PC!).

Keep flying and let us know how it goes!

The weird characters on the screen is a known issue. Should clear up if you hit EXT.

The binding trouble and loss of control would both be explained by poor signal strength. Check your antenna connection and condition first (correct length, no kinks, etc), then the radio installation.

Hi,
Thank you for your prompt reply's!

I told you that binding was a problem at the start already, so (back then) I turned off the PA has_PA=0. THe binding worked directly after that. So I turned the PA back on and I managed to bind after different tries.

Now, since I have these issues, I turned PA off, issues (seem to be) gone.

Could this be a defective PA on the board?

This board does not have a PA....
It`s a simple nRF24+ board and the only advance is the antenna socket.

Thank you for your remark.

This however is the board I ordered and paid for m.ebay.es/itm/251760613331?_mwBanner=1

Will contact the seller.

That NRF24L01 module you have does not have a power amp.

Also, I wonder if leaving the coax connector and soldering on an antenna behind it is bad practice and responsible for your issues?

I forgot if the H8c required rebinding everytime. I don't remember having that issue when I had the H8c quad for testing.

Hi,

Thanks all for the replys. I ordered another module and installed it and everything works like a charm now. Binding works directly now.

Does the power setting in the model menu really change the power of the module?

Here is a pic with the 2 pics next to eachother just before soldering:

With and without PA. by HaCo81 , on Flickr

Here is the rest of the images: flic.kr/s/aHsk7evMDC

I'm trying to config my Devo for the H8C and was wondering if anyone knows:

What channel# is the "gear" channel? (25/50/75/100%)
What is "trimmed"? is it just the scale of the ail/ele ? or anything else too?
What values does the quad receive to switch between the 4 settings

With the posted Model4.ini I have my H8C mostly working. I can't figure out which channel changes the performance mode (25%,50%,75%,100%). I found that the left 2 way switch turns the lights on and off, but would like to be able to change performance mode. Also, I have an issue where the quad wants to fly forward and to the right, even if I trim it all the way to the back and left. I tried the stock remote and this issue does not happen with it. Which of the channel settings can I play with to even the trim issue out? I have had the trim issue with all of my quads I have tried with my self mod'ed Devo 7e. Is it possible I screwed up a tx module soldering the wires wrong or got them too hot?

+1 on calibrating the sticks. A quad with 4 equally performing motors will be in trim. Additionally, damaged Rotors, fouled motor shafts, bad motors... those are common contributors.

The V2x2 protocol is set to 100%, so you can control the performance by using Scaling your output. Most of the V2x2 channels are the same, so look for a similar model (like X5C-1, JXD-392 or WLToys 323/333). You may only need to change the model name... but remember to test with props removed...

...and to calibrate the gyro ( on a leveled surface) by the stick command...before flying....