# Questions tagged [flight-controller]

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### CubeSat: When designing the PID Controller of the CubeSat, what are some constraints that you need to take into account?

For a 1U CubeSat project in which we need to design the controller for it. We decided to not include any propulsion system to keep it light, we'll just essentially drop the satellite on LEO and let it ...
• 111
13 views

### Hexacopter Simulation

I am doing a project to simulate a hexacopter with the mathematical model and its dynamics with PID. I've got the theoretical knowledge but am stuck on simulation. Would any of you happen to have any ...
1 vote
22 views

### SMC: Is there a way to control two sliding surfaces with just one control input?

This is a question related to Control Systems. I've been searching papers all over the internet with very little success. I know that traditionally we want one control per sliding surface but If ...
• 111
626 views

### Can someone explain this yaw angle calculation equation?

Nowdays, I am trying to understand PX4 Autopilot(Drone Flight Control Open Source) attitude control code. But I can’t understand formula below which is in attitude control code description. Can anyone ...
303 views

### What can cause yaw rotation on a multirotor when yaw control is disabled?

Let's assume that I assembled a multicopter (quadcopter, hexacopter or octocopter) and let's say that I disable yaw control on it while roll and pitch controllers are enabled. Now let's assume that I ...
• 211
297 views

### High derivative gain in PD control

Why does high derivative gain in PD control results in motor noise or chatter? The graph that I see on MATLAB simulation is smooth enough, so following that it should not make noise..
224 views

### Imaginary part in result of inverse laplace transform

I am working with a system(closed-loop feedback control) that has a transfer function like this F = 20*(s+5)/(s^4+13.5s^3+41s^2+80*s+100) this one is in the s-domain but for the response analysis, I ...
836 views

### Detection of linear acceleration vs rotational velocity/acceleration

I am wondering, how do you differentiate between linear acceleration and rotational velocity and acceleration for IMU? A rotational velocity or acceleration will still appear to the accelerometer as a ...
• 393
36 views

Can anybody please guide me about the robust modeling and control of a quadcopter. Where can i find the robust modeling that can be understandable for me as i am a undergraduate student. I am doing ...
1 vote
285 views

### Tuning a cascaded attitude and attitude rate PID controller

Assume that I have an object in 3D, and I want to have a controller that stabilizes its orientation (also referred to as "attitude"). To be sure we are clear: attitude is measured in "degrees" or "...
• 211
338 views

### Roll, pitch and yaw in a quadcopter

The axis definition affect the roll, pitch and yaw definition in a quadcopter? Image I have the axis defined this way: then to roll I have to put a higher velocity in (1) than in (3) (turn around ...
• 171
66 views

### BLDC Outrunner Direction Change?

I'm designing a Quadcopter for my project. I've seen a lot of guides that the motor rotational direction should be opposite to each other. My doubt is whether the motor have a variety of CW rotation ...
1 vote
62 views

### How should i select motor and blades for my Hexacopter?

I'm designing a fluid sprayer Drone (HEXACOPTER) for Agriculture as my college final year project. The capacity of the fluid spraying unit including fluid & Sprayer around 2kg. I don't know how to ...
216 views

### Why am I unable to tune the PID parameters on my quadcopter?

I am building a nano quadcopter in X-Configuration with coreless DC motors, 65mm 2 blade propellers and a 1S Lipo battery (860mAh, 25C). The weight of the assembly is around 70g in total. I am ...
1 vote
446 views

### How to attach flysky receiver to racerstar all in one esc and flight controller?

I am building an fpv racing quad I encountered the following problem: I have a Racerstar StarF4s 30A esc and flight controller combo and a Flysky 2.4ghz iA6B receiver how and where do I connect these ...
• 15
33 views

### How to make x variable change each time and read its value from txt file

I am working on my undergraduate project and this is my first time in using use python to control parrot bebop 2 drone and use BCI or BMI technology. I have x variable (int) and I want to read its ...
37 views

### Is not this guy using a flightcontroller?

I know this will not be a good way of asking something but I cannot think a better way. In this video : https://youtu.be/wg8ZbiC9IBw He builds a fixed wing an makes it fly, my question is related ...
• 153
99 views

### Helium Balloon Altitude and Velocity Control System

I am designing a helium balloon which implements a control system that can expand and contract the balloon using a motor, thereby increasing or decreasing buoyancy and, subsequently, acceleration. I ...
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21 views

### What parts of the flight system could you remove if you only care about flying up/down?

If you only need a drone to fly up/down, how could you simplify the flight system? What parts/propellers could you remove for instance? Could you enable a drone to fly vertically with only one ...
• 161
1 vote
27 views

### Naze32 flight controller not connecting to RC

Cleanflight reads my Naze32, but the RC values aren't responding at all. Everything is connected and double checked that the wires were connected properly and firmware was flashed. Just not getting ...
2k views

### How many independent control inputs does a hexarotor have?

6, because a rigid body has six degrees of freedom 4, since it is similar to a quadrotor, except with more motors 6, because there are six motors I was taking an online quiz, and I thought option 3 ...
2k views

### BetaFlight sees motors working, but motors not spinning

I am using FlySky i6 Transmitter and a FS-iA6B receiver. I have it set up using PPM and BetaFlight recognizes the motors in the Receiver section. All the values adjust according to the toggles and ...
• 113
80 views

### Compatibility of my quadcopter build

I am building my first quadcopter and have multiple questions. I am using a Crius MWC Multiwii SE 2.6 flight controller which will get input from a Raspberry Pi Zero. I have this 4in1 ESC and this ...
1 vote
80 views

Working on stabilizing a Quad using Arduino Due. I have slightly modified one of the examples of Jeff Rowberg's library to give yaw, pitch and roll angles (zero initialized angles). Moreover, I am ...
1 vote
314 views

### Could a hot air balloon be powered from the ground like a drone?

Could a small drone electric hot air balloon be made to stay in the air indefinitely? Use an electric element for heating the air. Powered and tethered from the ground like a kite on a string it ...
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1 vote
931 views

### Receiver is getting really hot

I am building a quadcopter and I am on the last part of it (normally the exciting part) where I bind the controller to the receiver. I can get the receiver, which is plugged into the quadcopter, to ...
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