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256 views

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 ...
2
votes
2answers
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 ...
3
votes
0answers
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. ...
4
votes
3answers
953 views

question about car-like robot localization based on dead-reckoning

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 ...
8
votes
4answers
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 ...
5
votes
1answer
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 ...
0
votes
2answers
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....
3
votes
1answer
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/...
5
votes
4answers
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. ...
5
votes
1answer
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
2
votes
1answer
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 ...
3
votes
1answer
2k views

quadcopter parameters calculations for simulink model

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 ...
-1
votes
2answers
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?
6
votes
1answer
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 ...
2
votes
1answer
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 ...
3
votes
4answers
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 ...
2
votes
1answer
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), ...
5
votes
1answer
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: ...
3
votes
1answer
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 ...
9
votes
4answers
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 ...
3
votes
1answer
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 ...
1
vote
0answers
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 ...
1
vote
2answers
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 ...
5
votes
1answer
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 ...
2
votes
2answers
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 ...
1
vote
0answers
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 ...
1
vote
2answers
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 ...
3
votes
1answer
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? ...
6
votes
1answer
875 views

What to do when the control input of the Kalman filter is unknown?

I am implementing a simple Kalman Filter that estimates the heading direction of a robot. The robot is equipped with a compass and a gyroscope. Say at time $t-dt$, the compass reports a reading $\...
9
votes
2answers
881 views

How to model unpredictable noise in Kalman Filter?

Background: I am implementing a simple Kalman Filter that estimates the heading direction of a robot. The robot is equipped with a compass and a gyroscope. My Understanding: I am thinking about ...
6
votes
2answers
281 views

Place for GPS antenna on autonomous vehicle

I used to think that the higher GPS antenna position the better until I read the following on GPSd FAQ: One common error is to place the GPS or antenna as high as possible. This will increase ...
7
votes
6answers
3k views

Polling or Timer interrupt?

We hope to build a simple line follower robot and we got a problem when we were discussing about PIC programming. We planed to write a endless loop, check the sensor panel reading and do the relevant ...
1
vote
0answers
147 views

Laser / photosensor pair or similar [closed]

I'm looking for a laser / photosensor pair (or product of similar function) for detecting when a beam is interrupted (no more than 3ft apart, probably more like 1ft). I'd like these to run off of 5V, ...
5
votes
1answer
159 views

Any globally unique signature in Ardupilot hardware, or Arduino in general?

I have several APM 2.5 boards and need to identify them based on some globally unique hardware signature that does not change with programming. Arduinos and atmel AVR chips in general do not have (...
2
votes
3answers
6k views

Assigning Serial number and GUID to a microcontroller

This might be a out of league question and may seems to be very odd.I am using multiple Arduino UNO boards over network and want to assign a GUID and Serial number to each board so that when ever they ...
3
votes
2answers
2k views

Design Calculations & Mathematical Modeling of Tricopters

I have been studying about building a tricopter. But I couldn't find the design calculations or mathematical modeling of the tricopter any where over the internet. What are the mathematical ...
0
votes
1answer
100 views

What modelling tools are available to design a robot [closed]

I am planning to build a robot. 1) What free or low cost robot modelling tools exist.
2
votes
1answer
6k views

AT command in SIM900A GSM/GPRS module to find out originating address of an SMS

I am using SIM900A for some purpose and want to know the number of the sender from where a message comes. I am unable to find the specific AT command related to receiving message which give me number ...
0
votes
3answers
809 views

H-Bridge using atmega8 microcontroller

I want to use my atmega8 uC as a h-bridge. Can anybody give me the source code using C, so that the microcontroller acts as an H-Bridge.
3
votes
1answer
657 views

How to correctly compute direct kinematics for a delta robot?

I'm trying to put together a simple simulation for a delta robot and I'd like to use forward kinematics (direct kinematics) to compute the end effector's position in space by passing 3 angles. I've ...
13
votes
1answer
575 views

How do SLAM algorithms handle a changing environment?

I'm doing some groundwork for a project, and I have a question about the current state of SLAM techniques. When a SLAM-equipped device detects an object, that object's position is stored. If you look ...
4
votes
2answers
456 views

What is an effective distribution of grayscale sensors on robot

I'm working on a robotics project, and I am using grayscale sensors to automatically follow a black line: turning 90 degrees, going round in a circle, and passing through gaps in the lines etc. I was ...
5
votes
4answers
1k views

Off-the-shelf micro fluid dispenser

Need a way to dispense micro liter amounts of water (lets say 1-10ul). Only thing I've found is piezoelectric dispensers and they are >$100. Any suggestions? I can build, but preferably would be an ...
6
votes
1answer
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 ...
6
votes
4answers
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, ...
12
votes
2answers
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 ...
0
votes
1answer
4k views

Build an WiFi IP camera with webcam [closed]

I have a USB webcam and a WiFi module which it can convert Serial data to WiFi and vice versa. The question is can I simply convert the data coming from the webcam to serial with a USB to Serial IC (...
0
votes
1answer
782 views

MPU-6050 + Arduino nano - Logic converter or not? [closed]

I bought this MPU-6050: link According to the manufacture site, the sensor logic level is 3.3V (though the ebay page says Power supply :3-5v) Should I use a 4 ...

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