# Tag Info

Accepted

### In how many ways can a six propellers drone fly or rotate?

practice In practice, every multicopter (including 6-propeller hexacopter and 4-propeller quadcopter) that I've seen so far has 4 degrees of freedom: pitch, roll, yaw, and climb. The minimum number ...
• 4,545

### Multicopter: What are Euler angles used for?

Your own equations make a lot of assumptions about the problem you are trying to solve. They are sufficient to solve your problem, but will not work for certain conditions (z = 0 for instance). ...
• 4,425
Accepted

### Ardupilot on Raspberry Pi

Firstly, you may be confusing ArduPilot/ArduCopter software with the ArduPilot Mega (APM) hardware platform. ArduPilot/ArduCopter is indeed a great piece of software and is still maintained. The ...
• 1,528

### How to recover low voltage LiPo battery?

First: Did you measure correctly? I know its not that difficult, but 0.32 V seems very low too me, even for a dead battery if its not a very old one. If you measured correctly, I would recommend to ...
• 106
Accepted

### Interference caused by multiple robots during task completion

I came across one paper that had a good description of this issue from Kristina Lerman and Aram Galstyan at University of Southern California entitled "Mathematical Model of Foraging in a Group of ...
• 192

### Why do the motors of my quadcopter not deliver sufficient power?

If I'm understanding you correctly, you are saying that the motors spin, but they don't spin fast enough to generate enough thrust to get the drone off the ground. It sounds to me, if this is the ...
• 16.1k
1 vote

### How to recover low voltage LiPo battery?

This problem was solvedâ€¦ dangerously. I knew my charger needed to detect a high enough voltage to even begin charging. So I took ANOTHER (admittedly 4S) battery, and plugged that into a positive and ...
1 vote
Accepted

### Powering multicopter with multiple dedicated batteries

I agree with lenik first statement, you idea is totally sound. Also your grounding to not have all the current drained passing through a single 'hub' is sound as otherwise you will need this central ...
• 1,412
1 vote

### Why are Euler angles used for drones

You can read about how a MEMS gyroscope works here, but the key concept I'd like to point out is that a gyroscope measures angular rate. It's not measuring an angle and dividing that by some sample ...
• 16.1k
1 vote

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

A disturbance yaw rate of $-0.1, \text{deg/s}$ seems way low. Are sure that in steady-state there won't be any cause external to your copter (very low airflow?) justifying it? Imbalance between the ...
• 4,005
1 vote

### How to calculate the pitch of the quadcopter rotor blade and their efficiency?

Not long ago I had the same problem of evaluating different blade designs. Well it's not an easy task. I used JavaProp which is a tool for evaluating propeller designs. The author has an phd in ...
• 111
1 vote
Accepted

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

Let me assist you and point you in the correct directions: the manual for your Racestar FC and ESC is here (it is in picture form): https://www.racerstar.com/racerstar-starf4s-30a-blheli_s-dshot-4-in-...
1 vote

### Why 3DR Power Module has two 5v and GND output

Dual power and ground pins are on the power module so that two other modules could be powered without having to split the power cables. Also, if the attached module draws significant current from ...
• 548
1 vote

### why we need both vel and acc contribution for actual position?

I didn't quite understand the codes you provide. Back to your wrong statement, velocity and acceleration are two different physical quantities. Acceleration is the time derivative of velocity. When ...
• 377
1 vote

### Why do the motors of my quadcopter not deliver sufficient power?

Either the battery levels are low or the flight controller hasn't been set up yet. First, calibrate the flight controller sensors. After, Calibrate the ESCs. (Do this without props!) Then set up the ...
• 248
1 vote

### Compatibilty of my setup?

The website that you have used seems to be down, however looking at the specs announced on banggood, it looks compatible. You would need some 8*4 props and a 3S battery, I'd advise getting a 3000mAh ...
1 vote

### How would i go about learning to code a flight controller?

Steps one should take to eventually write a flight controller software: Step 1 Learn the mathematics and physics laws behind the airplanes, helicopters, multi-rotors, etc. Step 2 Learn electronics. ...

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