Intermittent Roll inputs

Hi All,

I got my 7e, did the A7105 & CC2500 + 3 way switch mod. My hubsan x4 models works great.

Recently got a brushless model + lemonrx (DSM2) + PikoBlx fc. Tried setting it up using Betaflight. However, during my flight, i noticed i would lose roll stick input commands intermittently. Sometimes i get roll.. other times not.

I went into BF and looked at the channel monitors. I noticed the i lose Roll stick command when my throttle is around 1400-1600 levels. I tested holding my right roll stick to the right and holding it there. Then i slowly moved my throttle up.. around 1400-1600 lvls, the roll input drops to 1500 ... then when the throttle goes beyond or below that levels the roll goes back up to 2000 (still holding the roll stick to the right). This happens on the left as well.

Also happens with my YAW stick.

Anyone have any idea whats going on? I have tried various stuff.... re-calibrating, setting the rxrange for all sticks to 1000 2000 in CLI, scale set to +/- 147 (other values like fixed ID, +/- 150 all left unchanged).

Please note this is my first "quad" setup so i may hv done something wrong. Posted my model.ini in Daryoon's 7e thread and was told it looked ok.

Please help... thank you and Happy New Year!!!

Look at the Channel Monitor on the TX.
If there is the same behaviour, then you have a hardware problem with the Stick Pots.

thanks for input... will go check that out tonight and report back...
Funny tho as my Hubsan x4 seems ok. Unless i did not notice it...

cheers and Happy New Year!!

HI Wene001,

Your are spot on!! I checked the Channel monitor on the TX and i noticed the same behavior. So looks like a hardware problem with the Stick Pots.

Would it an easy fix? If so, any idea where i can get info to fix it?

Thank you very much.

Colin

I think I had a similar issue a while ago.

In the mixer menu when setting the curve type to "fixed" the source automatically becomes "none".

Try setting the source to "none" before setting the curve type to "fixed" then save and check in the channel monitor again.

will try that out as well.... thanks

Also, this might be irrelevant for this issue, but, what diodes did you use for the 3 way switches?
1N4001's caused me some problems with interaction between switches and trim buttons, so swapped them for 1N4148's to fix it.

I would look for problems with the connector for the aileron potentiometer cable, or the potentiometer itself.
when cleaning the pot doesnt help, your last chance is to change the pot.

I tried switching source to none first.. unfortunately thst didnt work. Also used the diode with more numbers.. tge 2nd one. Sorry replying from phone so kinda stuck on page.

Thanks for input tho. Much appreciated

Hi Wene001

Thsnks for the pointers. Will go research on pots n potentiometers to see what they look like.

Sorry.. quite new to this stuff.. so steep curve. I dont know how i did the mods now looming back. Hope fixes will work.

Thanks a bunch.. much appreciated input.

See this:
www.deviationtx.com/forum/6-general-disc...tion?start=560#65728

I think they are for sale soon.
Hall Sensor for Devo 7e.............top

edit: i have reread your first post...this is not a typical pot issue

Would first try to remove the switch mod and/or check the cables

if you supply your model ini I'll load it on my 7e and see what happens.

will do over the weekend.

Also, want to say thank you gain to everyone for the assistance so far...

Just looking at your ini on rcgroups again. Noticed a problem, the safety switch on ch2 (Ail) is set as the rudder stick (yaw), try set the safety to none on channel 2

Hi everyone..

just to update again, I opened my TX... can't see any pinched or damaged wires anywhere. I checked the wires for my 3pos switches. One seemed loose so i soldered it again. No change. Sigh

Just to further clarify if it gives a better idea on issue, on the TX channel monitor, when i push the roll stick full left or right and hold it there, the values only drop to zero when i move rudder to the left. If i let the right stick go.. it goes back to the said values. Only left rudder.. working fine on the right rudder. Am in mode 2.

Thanks

Hi Gerry... very logical ..... will try that asap...

Thanks
Colin

Morning Gerry,

I changed channel to none for safety.

OMG!! Channel monitor looks like bits working properly now thanks to you.

I'll check this weekend on betaflight to see if the issue has been sorted. Hopefully it will.

Will update again if there are any issues.

Thank you so much. Yay!!

And thank you wene and everyone else who have provided support. Much appreciated.

Hi all,

just posting to update in case anyone else has the same issues and need help.

Finally managed to "test" tx again following Gerry's post:
the safety switch on ch2 (Ail) is set as the rudder stick (yaw), try set the safety to none on channel 2

Everything works so far. Yay!!

I must say that for those using the 7e, a lot of understanding and experience is needed. I almost "killed" it again when putting it back together. My 3pos switch wires came loose, then a wire from my CC2500 came loose.. had to resolder everything up again. definitely not easy.

But anyway... thank you again for all the help.

Hey Colin,
Thanks for the update, glad it is working for you. Now get out and fly!