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Questions tagged [uav]

UAV means "Unmanned Aerial Vehicle". UAVs, commonly known as drones, are either controlled autonomously by computers in the vehicle, or under the remote control of a navigator, or pilot on the ground or in another vehicle.

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Custom radio modules/frequencies for ELRS

I'm trying to develop a custom RX/TX for UAV piloting on a non-standard frequency. I tried decoding CRSF from the remote control, connecting to the S.Port etc., but without much luck. I figured out it ...
Secret-guy's user avatar
0 votes
1 answer
120 views

Why do FPV systems (or drones in general) not use lower frequencies?

Why do TBS Crossfire, ELRS etc. not use lower frequencies like 433MHz? If we omit legal regulations and antenna size, are there any drawbacks? Lower frequencies provide longer communication distances, ...
Secret-guy's user avatar
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107 views

Computation Doppler shift in ppm

I am computing Doppler shift for different flying platforms and after my first presentation, it was suggested to revise in ppm. I compute always in Hz and have never heard even about this unit until ...
Aid22's user avatar
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0 answers
113 views

PID output to motor rpm

I am working on my project "Control design for tilt rotor." The UAV has 4 tilt rotors and I am using PID to controller for position and attitude control (outer and inner loop). ...
Dhruvil Chavada's user avatar
2 votes
3 answers
1k views

Why new/recommended MEMS IMU for AHRS for drones are 6-DOF instead of 9-DOF?

I'm developing an quadcopter as an DIY project. I'm in nascent stage of development. I've just finalized the design/working philosophy. I'm planning to fuse data from 9-DOF (9-Axes) IMU + GNSS + ...
Dark Sorrow's user avatar
1 vote
2 answers
1k views

What does the term "boresight", and what do the phrases "boresight adjustment" or "boresight calibration", mean in the context of laser scanning?

I have been studying the laser scanning literature. In doing so, I often come across the term "boresight", and the phrases "boresight adjustment" or "boresight calibration&...
The Pointer's user avatar
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0 votes
1 answer
87 views

What's the best way to geolocate a walkie talkie broadcasting on FRS channels using a UAV?

I'm researching methods to geolocate a fixed walkie talkie broadcasting on FRS channels. I need to detect its location using a UAV. The UAV is fixed-wing, so it can not remain stationary. From what I'...
elile's user avatar
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2 answers
853 views

Implementing powerline communication on a high voltage DC line with an AC power-line adapter

I am currently working on a tethered UAV project (please refer this). I am thinking of tethering the power as well as data through the two power cables that will go up to the UAV. I plan to use 300V ...
curious_techie's user avatar
0 votes
1 answer
256 views

Electronically Actuated DPDT Switch?

I am trying to be able to dynamically switch two wires on a brushless motor ESC for a Quadcopter. The plan is to wire an arduino to the flight controller so that I can program it to switch the ESC ...
UC SEDS's user avatar
0 votes
1 answer
96 views

How to use extra channels in drone controller for other purpose [closed]

I'm doing a hexacopter for my academic project. I brought flysky fs-ct6b drone controller. It has 6 channels. 4 channels is enough for controlling the drone. but I don't know how to use another extra ...
Dharani Adithya's user avatar
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3 answers
4k views

How often is FPGA used for UAV flight control? [closed]

I need to design a flight controller for a UAV. I searched the internet and found that FPGAs are mostly used for communication (encryption, decryption etc.) and feature extraction. To me it seems that ...
Alireza's user avatar
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1 vote
2 answers
114 views

UAV-towed gradiometer: magnetic signal decay with water depth

I want to use an unmanned aerial vehicle to tow an airborne gradiometer. Goal is to detect historic anchors buried in the sea floor. What is the effect of (sea)water depth on the magnetic signal? Any ...
user158037's user avatar
1 vote
1 answer
151 views

Compensating for MEMS Gyroscopic drift

I'm new to IMUs and know that they are prone to high drift, which depends on Temperature, White Noise and Time, but the most uncertain drift is caused by time, and under certain circumstances, drift ...
Tanishq Jaiswal's user avatar
2 votes
3 answers
595 views

Finding true north in UAVs

In my application, I need to find true north direction, for reference purpose. I am having a GPS enabled drone. I have searched over Internet and found that moving in the north direction while keeping ...
Akshay's user avatar
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0 votes
1 answer
412 views

How to implement a BLDC for variable torque in its phase (InstaSPIN, TI)

By chance I read this patented method to control the rotor pitch without a swash plate usually a helicopter, by adding two parallel hinges on each blade root. When add torque to spin it the pitch ...
einzeln00's user avatar
1 vote
1 answer
807 views

Electronic hit detection

I'm building various r/c vehicles like warplanes, tanks, auto-turrets, etc. and I want to fit some of them with some kind of a weapon. I've decided an air soft gun is a good choice. So, mounting and ...
Chumanista's user avatar
3 votes
2 answers
800 views

Quad copter - from PID values to motor power

I am struggling with a completely self built/written quad copter I am working on. I am working on the PID controller for balance, right now just with a P value and it only reacts on ROLL and PITCH ...
John's user avatar
  • 213
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1 answer
73 views

Can you implement a control algorithm and send the inputs via xbee?

I know this question is little bit vague, but let's say that I have a robot or a quadrotor to control. I want to implement the control algorithm (PID, robust, or LQR) in the PC not in the robot/quad, ...
Berrima Hadj tahar's user avatar
1 vote
1 answer
383 views

Will this ESC work with these motors?

I am looking in to making a UAV quadcopter and I don't know how to calculate what ESC to use with the motors I have picked. I am looking at buying the HobbyKing Red Brick 10A ESC and the Turnigy ...
Riley Lloyd's user avatar
12 votes
2 answers
836 views

How do IR rangefinders accomplish centimeter precision without high speed / high cost parts?

I'm currently working on a system that requires an RF rangefinder with ~15 cm precision, over a range of about 50 meters. My research into the field has shown that I'll need complex and expensive ...
Chris's user avatar
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-1 votes
1 answer
862 views

How can an experieced programmer get into embedded programming and robotics [duplicate]

Possible Duplicate: How to become an embedded software developer? I would like to know what is the best method to begin learning embedded programming and electronic skills? I am already very good ...
comneleceng's user avatar
7 votes
1 answer
2k views

Arduino + gyro/accelerometer == flight controller ...?

Can I use the combination of an Arduino Mega + MPU-6050 gyro/accelerator module instead of a flight controller? Is there something else needed? It is said that the gyro/acceleration can be used to ...
David's user avatar
  • 236
3 votes
2 answers
1k views

Extracting images from a camera in real-time

Me and a group of students are building a UAV and we want to put a high quality camera in it (i.e. a decent ~100mm zoom lens) and interface the imagery with on board processing. I have looked around ...
Madcowswe's user avatar
  • 338
0 votes
1 answer
732 views

Hacking the ArduCopter Software

I'm interested in using software from diydrones.com specifically written for UAV helicopters called ArduCopter. However, the instructions on the website assume that you've bought the specialty ...
Rowan's user avatar
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11 votes
7 answers
5k views

How do I implement accurate distance measuring (to ground) on a plane-like UAV for heights over 10m?

How do I implement drone-to-ground distance-measuring for autopilot landings for heights over 10m? I found ultrasonic to be too inacurate, let alone GPS. Maximum height is 1000m, Vmax is 100 km/h, ...
fakemustache's user avatar
3 votes
2 answers
6k views

How accurate are altimeters?

I'm building a quadrocopter and would like to prevent drift using a down facing camera. To do this properly, I need to get the height of the drone from the ground. Obviously the ground can vary, so ...
Bojangles's user avatar
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13 votes
3 answers
2k views

Stopping drift in hovering quadrocopter

I will be building a 4 propeller quadrocopter drone at some point. I want to make it relatively easy to fly by getting it to hover still when the controls are not touched. Can someone offer some ...
Bojangles's user avatar
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2 votes
3 answers
573 views

Want to make a UAV

I've been inspired by the guys at DIY Drones and I'm toying with the idea of making a UAV. To transmit the sensor data, I was thinking I'd go with a 60mW XBee, but I also would like to transmit live ...
Matt Williamson's user avatar