URGENT HELP WOULD BE GREATLY APPRECIATED

[Murtaza Ilyas]

I have two problems left to finish my college project.

NUMBER 1
When I reach the final steps of the transmitter setup in the open pilot software the pitch and roll movements I physically do don't match what's happening on the screen. The images I have attached show what I am physically doing and what the software thinks I am doing. How do I fix this problem.

NUMBER 2
All four motors are not spinning at the same speed. As soon as a reach around 10% thrust the front two motors spin a lot faster that the rear two. I know this is an extremely common problem but seeing as this is the first quadcopter I have every built I require some help in order to solve this issue.

All help is greatly appreciated.

 

[GJH105775]

Are you referring to something like a reversed axis, or something like all movements being rotated 90 degrees?

 

[Jackson]

First have you chosen the correct mode or your transmitter, 1 or 2 at the very start of the wizard?

 

[Murtaza Ilyas]

If I move the right stick in the upwards & downwards direction to control the quadcopter's pitch, the wizard is telling me that I'd be controlling the roll. When I move right stick side to side to control the roll, the wizard is telling me that I'd be controlling the roll. So no matter what direction I move the right stick I'd only be controlling the roll. Its as if there's no way to control the pitch.

Yes, I am in mode 2 before I start the wizard. I choose the Acro setting and Mode 2 option within the wizard.

 

[GJH105775]

If I move the right stick in the upwards & downwards direction to control the quadcopter's pitch, the wizard is telling me that I'd be controlling the roll. When I move right stick side to side to control the roll, the wizard is telling me that I'd be controlling the roll. So no matter what direction I move the right stick I'd only be controlling the roll. Its as if there's no way to control the pitch.

Yes, I am in mode 2 before I start the wizard. I choose the Acro setting and Mode 2 option within the wizard.

Check that the channel inputs are set as such.

 

[Jackson]

Go into your radio's menu screen that that tracks/shows the various channel/stick movements. Maybe some clues there.

This is where mine is.

 

[Murtaza Ilyas]

I went to the RC input in the transmitter setup of the software and could see that happens when I move the sticks. Hopefully the images will help!

 

[GJH105775]

Do you have any mixing on in your Radio's settings? For delta wings you need mixing like this, but quadcopters do not.

 

[Murtaza Ilyas]

These are the settiings i have before i go through the wizard! Are there any changes that need to be made?

 

[Jackson]

Put that last slider 'UP' to fixed wing.

 

[Murtaza Ilyas]

Thanks a lot! Moving the slider up fixed the issue! I still have the problem of the motors not spinning in sync! I'v calibrated the ESC's. I'v gone to configure, altitude and computed the accelerometer and gyro bias but the quadcopter still tips.

 

[RGJameson]

Well you have to carefully review each step. Don't assume anything.

 

[Murtaza Ilyas]

I've done each of the above steps with no success. The cause of the problem may be due to the motors not being level with each other. I designed each component and had them 3D printed. Each motor sits on the end of each arm which is connected to the body. Therefor some arms droop down more than others. I have designed my quadcopter to look like the MQ-27 Dragonfire from the game Call Of Duty: Black Ops 2. What I'm trying to say is all four motors aren't on the same exact level as the quadcopter in the above video. Is this the cause because I read that if one motor thinks it's lower than the others then it will try to compensate by speeding up. When I am on the open pilot software and I link all four motors, they all spin at exactly the same speed but when I dis-connect it from the computer the motors continue to spin at different speeds.

 

[Murtaza Ilyas]

 

[Jackson]

What I'm trying to say is all four motors aren't on the same exact level as the quadcopter in the above video. Is this the cause because I read that if one motor thinks it's lower than the others then it will try to compensate by speeding up

That's not exactly true. When you tip it lower in any direction it tries to compensate, because the gyro senses it's no longer level and adjusts.

Many tricopters have the rear motor higher. Here's a often recommended yaw assembly.

I'm sure the height differential is way more than yours.

And how would you explain this sort of configuration?

 

[Murtaza Ilyas]

Could it be the PID settings?

 

[Murtaza Ilyas]

I think I may have found the problem. When I go up to 10% thrust & move the position of the CC3D, the motors react. Now I need tp find the best place to put it and where to face it.

 

[GJH105775]

I've done each of the above steps with no success. The cause of the problem may be due to the motors not being level with each other. I designed each component and had them 3D printed. Each motor sits on the end of each arm which is connected to the body. Therefor some arms droop down more than others. I have designed my quadcopter to look like the MQ-27 Dragonfire from the game Call Of Duty: Black Ops 2. What I'm trying to say is all four motors aren't on the same exact level as the quadcopter in the above video. Is this the cause because I read that if one motor thinks it's lower than the others then it will try to compensate by speeding up. When I am on the open pilot software and I link all four motors, they all spin at exactly the same speed but when I dis-connect it from the computer the motors continue to spin at different speeds.

Well that is not likely your problem, on a 400mm quad you could have a 2'' difference and not experience any real problems.

 

[Murtaza Ilyas]

- I'v put the quad flat and leveled the gyro & accelerometer
- All 4 motors are spinning in the right direction
- The cables going into the CC3D are correct
- The FC itself is facing forwards

Any suggestion as to what i could try, check or change what help!

 

[Jackson]

- All 4 motors are spinning in the right direction

How about the props? Are you sure you got the correct ones (CW or CCW) in the correct positions?

- The FC itself is facing forwards

If you draw some lines do you get this?

The green being the FCB. It can be shifted a bit up or down (blue line) but it needs to centered side to side.

How about a top view of your quad.