# All Questions

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### Arduino Operational Frequency

Just wanted to clarify some pretty basic Arduino concept: If I put this code into an arduino board: ...
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### Where to ask NXP LPC1343 / ARM Cortex M3 related questions

I am a beginner to robotics and embedded systems. Consequently I have a lot of questions related to the toolchain and how things are going together like how to debug or how to connect a bluetooth ...
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### How can i reduce the amplitude of a signal?

I am new on this site and also new in microcontrollers programming. Supose i want to generate a signal with a fixed period. How can i reduce the amplitude of signal ? There is more ...
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### Differential drive trajectory following control

I have a robot platform with differential drive which knows it's position and orientation. Lets say that the space through which the robot moves is known and it has only static obstacles. The task is ...
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### Where to purchase parts to a mini conveyor?

I want to build a similar project like this. http://www.youtube.com/watch?v=QNv9nEzGLhs or http://www.youtube.com/watch?v=gfswg0GGAgo But where can I buy the parts needed?
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### Need Troubleshooting help regarding Arduino Uno & HC-06 Bluetooth connection problem

I just bought Arduino Uno and HC-06, I hooked up the connections: 5V Bluetooth → 5V Arduino GND Bluetooth → GND Arduino TDX Bluetooth → RX →1 RDX bluetooth → TX → 0 ...
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### Software libraries for parsing sensor data

What software libraries are there for assisting the general problem of parsing a stream of sensor data? We use various sensors like LIDARs and GPSINS units that provide messages in proprietary binary ...
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### Atlas Robot Reference

Boston Dynamics keeps making great robots, however, I dont see any papers that they publish. Although now I can find papers on people using the ATLAS robot, I can not find an original paper detailing ...
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### Control Arduino firmata with HC-05

I'm using the johnny-five library to control an Arduino Uno running StandardFirmata. I have a HC-05 bluetooth module that I want to use to wirelessly control firmata, but have yet to get it working. ...
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### 24v dc to 12vdc converter

I have built a r/c car that runs on 2 30AH 12V DC deep cycle batteries. The motors are 24v motors that will each draw around 15A at full power. My motor controller can handle this, as well as ...
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### Sourcing Motors for larger robots

I have been wanting to build larger robots and r/c cars for some time now, but one issue I have had is trying to find larger motors, in the range of electric wheelchair motor size. I found one set on ...
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### Denavit–Hartenberg parameters of a robot with spherical wrist

What are valid values for the Denavit-Hartenberg parameters $d$ and $a$ (sometimes called $r$) of the last 3 links of a robot with spherical wrist? From: http://www.eng.utah.edu/~cs5310/chapter4.pdf ...
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### Robotics Stackexchange vs ROS Answer

Robotics Stackexchange vs ROS Answer What it better and what purpose?
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### Reading data from D+ and D- pins of a USB

So I have this optical mouse with me, which has a PAN3504DL-TJ optical sensor. It has a USB interface and when I looked up the internet, all I could find was tutorials using A2501 or sensors in those ...
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### which dc motor to use for linear horizontal motion of 1 meter?

for my project, i need a 12 v dc actuator that moves in left-right direction. i need the maximum movement to be 1 meter. i found that for 1 m movement, the cost of buying it is not feasable . :P Any ...
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### How to learn designing a toy helicopter?

I have been searching for a good resources to design my helicopter since I bought Arduino Uno with some other robotics materials. The resource must be easy-to-understand, explains how to design the ...
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### Fit robot simulator to robot

I have odometry data $(x, y, angle)$ of a real two-wheeled robot, who received control commands $(forward speed, angular speed)$. Now I want to code a motion model (in C++ (/ROS)) which should follow ...
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### PID control against sine wave error

I'm writing a PID to control a toy car that follows a black line on a circuit. I've tuned my PID and it works at high speed for all the circuit except the winding section. For that, the error signal ...
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### Sensor for tracking relative position of human

I am making a robot that needs to continuously track the relative position of human, up to 15 meters away and with at least 300 degrees coverage. Currently I am using a Hitechnic IRSeeker v2 sensor ...
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### Do servo motor specifications take into account the gear ratio inside?

I am looking at buying a servo motor for a an application that must be able to lift 4-5 lb at a rotational speed of approximately 1rpm. The servo motor listed here ...
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### How make side scan sonar

A side scan sonar structure of care. sensor placement, etc. .. mechanics. However, almost no info I can find on the net. Can anyone help? I am interested in the implementation of mechanical, sensor ...
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### Find a 2d arm and services to program robotic arm interactions with windows

I asked this question: Capacitive touch input robot to remote access iPad the answer was buy a robotic arm. I picked out an arm with the OPs help. He recommended a more simple 2d arm. Could someone ...
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### How to use TOA (Time Of Arrival) to measure 3-axis location of a wireless device?

I need to read the location of my device within a 1m radius sphere, with accuracy of 5-10cm. The device is handheld and wireless, and currently communicates using a Bluetooth v4 chip. I could add an ...
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### Connecting Wifi bee with Xbee USB adapter

I started to follow "Get started with the Wifi Bee" tutorial in Wifi bee v1.0 wiki page. I am using Xbee USB adapter v2.0,Wifi Bee-RN-XV,mini USB cable as listed in Tools needed. When i conneted the ...
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### Are propellers dangerous?

Aren't all propellers super dangerous? How are these startups like Hex and Pocket Drone selling drones as 'kid-friendly' to consumers? What happens if a kid puts his finger in a propeller's movement ...
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### How to rotate covariance?

I am working on an EKF and have a question regarding coordinate frame conversion for covariance matrices. Let's say I get some measurement $(x, y, z, roll, pitch, yaw)$ with corresponding 6x6 ...
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### Any image transfer protocol for wireless serial transfer?

I want to send image over wireless serial communication. I am planning to capture images using either raspberry pi or stm32 mcu using DCMI and then transfer image using wireless serial communication ...
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### Capacitive touch input robot to remote access iPad

I'd like to buy a capacitive touch input robot in order to remote access my iPad but I'm having trouble describing a correct kind of robot. I would like to keep lag down to an additional 60ms so ...
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### Best Way to Sense Rubiks Cube Movements

I was wondering what was, in your opinion, the best way to study the different motions of a Rubiks Cube. I want to be able to recognize what face moved and in what direction. Would I be able to get ...
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### arduino serial mixing incoming commands

In my project i'm aiming to control a quadruped robot from my android phone using raspberry pi as a middle device (web server). In order to make sure that the server on RPi working fine i googled and ...
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### the information on the company to design camera algorithm for home cleaning robot [closed]

I look for the company to design camera algorithm for home cleaning robot Our company is located in Korea and have plan to produce new model with better algoruthem If anyone knows about this , ...
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### What do we call a coupling with infinite range of rotation

In most situations, range of motion is limited by the fact that we need to carry power or information past a joint. So, past a certain point there are either cables in the way, or the cables would ...
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### Why is ROS not a real-time operating system?

ROS is not real-time OS. After reading the architecture of ROS, I am unable to realize why is ROS not real-time? What part of the architecture or what design decision is causing that?
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### Help sending serial command to Roomba

I have a Raspberry Pi hooked up to a Roomba 560's serial port. While going over the spec, I noticed movement controls weren't as simple as I expected. I can't send bytes larger than 255, but, ...
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### Neuromorphic Engineering and Robotics

I have been into a boggling paper research on neuromorphic engineering and its implications on robotics applications, lately. It is relatively a less applied field and full of academic papers and ...
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### Permanent Magnet DC motor in generating Mode :

i am Final year student of electrical Engineering and my project involves control of PMDC motor. I have bought a PMDC motor with specs as follows : Voltage = 36 Volts RPM = 1700 rev. per ...
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### How to calculate the power required to drive a fan

I need to specify a fan motor combination and wondered if there are formulas that can work this out? The fan we are using is a crossflow fan: So I'm assuming the power required to drive it is ...
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I do not know anything about image processing, but I thought of a neat project that I'd like to work on. Hopefully it will give me some good exposure to video and image processing and real-time ...
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### How to measure displacement, cheaply and without using an accelerometer?

Motion is known to be confined in a sphere with radius of about 0.5m, and resolution doesn't have to be very high (5cm is enough). The device will actually be incorporated in a toy designed for kids. ...
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### Find the difference between two consecutive sensor readings in real-time in C

I am working on a Micromouse and it has three sensors. Call it S1,S2 and S3. For now, I have to use S1. The idea is this S1 controls the left motor and S3, the right motor. S2 will detect wall in the ...
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### Slam and Vision (good resources)?

I would like to know if there is a good source that combines Slam problem with vision. From mathematical perspective, there are numerous resources that handle SLAM ,however, I didn't find a good ...
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### Is there a cheaper alternative to SDP-PI for gears and shafts?

Is there a reliable online supplier for gears, bushings, shafts, etc. that is more suited to hobbyists and smaller parts than McMaster Carr or SPD-PI? Most of their parts are rated for extremely high ...
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### Looking for a way to scan cylindrical objects

Can anyone recommend a commercial or solid, reliable DIY solution for scanning cylindrical objects? I've seen a couple of simple hacks for flatbed scanners, but I'm looking for something I could make ...
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### robotics as a beginner [closed]

I want to begin robotics.So as a beginner what micro-controller would be convenient?Arduino or PIC?what type of robots can be built with arduino or PIC? Should I start from just a line-following ...
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### Need help with wiring Arduino powered Android Controlled Car

I am building a Car that is powered by Arduino and controlled by Android phone. This will work via Bluetooth connection between Arduino and Android phone. Below are the list of parts that I have: ...
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### Jacobian method for inverse kinematics

I have big problem. I have to solve inverse kinematics for a manipulator with 6-DOF using jacobian method. From what I know to do that I need to have matrix of transformation and Denavit–Hartenberg ...
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### How to use Kalman Filter to predict the state of a robot, using the Robot Operating System (ROS)

I have a GPS-INS system, which gives an output raw data (lat, long, pdop, gdop etc). How can I implement a Kalman filter in ROS, that combines the data from GPS (1Hz) and IMU (100Hz) and outputs ...
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### Can inverse dynamics control be regarded as a function?

I know that inverse kinematics ($p \rightarrow q$, p: desired pose of the end-effector, q: joint angles) is not a function because there might be multiple joint angle vectors q that result in the same ...