# All Questions

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### Where I can learn algorithms or and find examples of code for controlling a rover? [closed]

I am a programmer by profession and new to Robotics. I have studied ECE, so know electronics, but not very familiar with mechanical aspects of robotics. I am working on a learning project with Dagu ...
7k views

### Razor IMU Arduino interfacing

I was looking into the Razor IMU from Sparkfun, and realized that the only example code on sparkfun's website was for it was meant for hooking it up to a computer (the AHRS head tracker used a serial ...
109 views

### May I have some suggestion on inexpensive robotic arm? [closed]

I want to build some simple application. I need a 5 or 6 degrees of freedom robotic arm. The arm must have feedback, so that I can control it preciously. The arm must be able to handle at least 5 lbs. ...
953 views

I have a question about car-like robot localization using only dead-reckoning. Given: robot position (at current time step) in the form $\begin{bmatrix}x & y & \theta\end{bmatrix}$ (theta is ...
2k views

### Why do 3-axis accelerometers seemingly have a left-handed coordinate system?

Careful inspection of page 35 (figure 58) of the ADXL345 datasheet shows that under gravitational loading only, the chip uses a left-handed coordinate system. My own experiments with this chip ...
252 views

### Transducer for underwater applications (passive sonar)

I'm kicking around the idea of building a small passive sonar for an autonomous submarine. I've looked through the net for parts and finding a good transducer for converting the sound underwater into ...
2k views

### Need suggestions for object recognition

I am tasked with creating a system that will recognize fish pulled out of a lake. The system should be able to identify the type of species of fish. Typically, I turn to Arduino for projects like this....
772 views

### Digital servo shaking

i need your advice if someone experienced something similar. I try using digital servo but when i tried to connect it to board by this tutorial https://blogs.oracle.com/hinkmond/entry/...
11k views

### Stabilizing a quadcopter with optical flow

My quad copter can balance itself in the air using data collected from mpu6050. With the sonar sensor, it can hover at a specific height, but it moves on the horizontal plane in a random direction. ...
103 views

### What frame of reference is used during Visual Servoing?

I'm new to the whole visual servoing area. I'm now reading the tutorial Visual Servo Control Part I: Basic Approaches" and I don't understand something fundamental - what information is available to ...
16k views

### How Yaw, Pitch and Roll effect the flight of Quadcopter? [duplicate]

I am doing simulation of Quadcopter in simulink. I want to know how Yaw, Pitch and Roll effect the flight of Quadcopter? and How these are different from a single rotor helicopter? Mainly how to ...
118 views

### Choosing a platform to start [closed]

I'd like to start with robotics, but unfortunately I know very little about HW engineering. Moreover I used to use such languages as Python, C# and Java, and do not have much experience in C. Still I ...
1k views

### Effective motor type for robotic arm?

I am trying to build an arm that will have about 5 by 5 by maybe 7 or so centimeters of room for a rotary motor capable of lifting it. The joint will basically allow the arm to rotate in a single ...
2k views

I want to make a mathematical model of quadcopter in simulink. I have studied quadcopter, although I am new and not build any flying robot before. I studied so far that I have to use four brushless DC ...
444 views

### Why do 1000 rpm and 10 rpm DC motors cost the same? [closed]

Today I was going to buy a motor online, and saw that 10 rpm and 1000 rpm DC motors cost the same. How is it possible to change the rpm without requiring any additional parts cost?
593 views

### Roller Screw drive - axial movement instead of friction

I need an equation or a some hints to solve the following problem. Imagine a roller screw drive. I apply a torque of T to translative move my load mass ...
658 views

### Software for designing mechanical systems/robotic parts [closed]

Which software can be used to prototype/design robot parts (mechanical parts, body, gears, etc)> I have some crazy idea I would like to try (quadripedal walking robot, animal-like), but I'd like to ...
126 views

### Localising a robot swarm non-optically

This question is further to Localizing a swarm of robots. In summary: I want to create a swarm of robots which can each measure their own position in a 3x2m room with a 25cm high ceiling, to an ...
197 views

### Tiny high torque actuator/sensor design

I need to assemble a small (about 8cm x 5cm x 5cm maximum), actuator with as much torque as I can get at that size. It will be driving a small reel and pulley (reel is ~1.25cm^3, 5mm center diameter), ...
479 views

### Gears modeling in Google SketchUp and SketchyPhisics

I'm trying to make differential in Google SketchUp using this tutorial http://support.ponoko.com/entries/21249896-Gears-and-Joints-with-SketchUp-Sketchy-Physics for gears modeling. But I have problem: ...
1k views

### How do I Calibrate Analog Thumb stick? [closed]

Outline: I'm trying to work with an Arduino and Analog thumb stick to get values for a simple differential drive robot I'm working on. The Keyes_Sjoys Arduino Joystick Module I have in my possession ...
576 views

### Localizing a swarm of robots

I have a 300cm x 300cm room with a 25cm high ceiling (yes twenty five centimeters). It contains 50 small wheeled robots (about 20cm x 20cm). A central computer will orchestrate the movements of the ...
658 views

### How to control a brushless motor?

I consider using a brushless outrunner motor, designed for helicopters, in my driving roboter. How can I control such a brushless motor with my micro controller? Of course I'll have a separate power ...
301 views

### Motor Controller with micro USB interface [closed]

I am a Robotics enthusiast and planning to make a small and simple four wheel car whose motors are supposed to be controlled by an Android device housed inside the car by means of the micro USB port ...
1k views

### How do I send text to a Torobot USB device?

I'm trying to get the "Torobot" USB servo controller to work with Angstrom Linux on a Beagle Board XM. The servo controller registers as a USB device. The device just takes simple text commands, but ...
133 views

### Actuator design. plausible?

So i got this idea waay back when i was in highschool as a kind of electromagnetic analogue to a biological muscle. it is basically a long stack of thin electromagnets connected in parallel. . when ...
4k views

### Tracking with accelerometer and gyro versus multiple accelerometers

I'm building quadcopter and most of the control systems use one accelerometer and gyro. I've read few papers and usually accelerometer is used as reference to the ground because gyro slowly drifts ...
233 views

### running UWSim commands in ROS

Where can I find a good documentation about the UWSim in ROS. Actually having the source files is not enough and it is actually hard to follow all the functions. for example, how can I use these ...
4k views

### How to control the position of a pneumatic piston?

How can I control the position of a pneumatic piston? The only way I know about is using a magnetic reed switch (magnetic sensor) with a matching piston and use some type of control algorithm, like ...
164 views

### In SLAM, how does a laser range finder produce pseudo-segments from dynamic objects?

In this paper, the author says that during SLAM process, pseudo segments that appear from any momentary pause of dynamic objects in laser data would make the map unsatisfied. How is this caused? ...
875 views

10k views

### How to determine the parameter of a Complementary Filter?

I know that the Complementary Filter has the functions of both LPF and HPF. But I think my understanding on the principal behind it is still unclear. I am quite new on digital signal processing, and ...
12k views

### What is the difference between RC motors for cars and helicopters?

I am working on a robot with focus on speed. At the moment I am looking for a suitable motor but it world help if I understood the difference between the various options. To provide some background, ...
9k views

### Approach to using PID to get a differential robot driving straight

Consider a differential drive robot that has two motorized wheels with an encoder attached to each for feedback. Supposed there is a function for each DC motor that takes a float from -1 to 1 and sets ...