# All Questions

19 views

### thrust measurement

I try to find out the relation between rpm vs. thrust for a battery+motor+propeller combination. the image shows my setup and also the measurement result. Can anyone explain how l should use this ...
7 views

### How to control motor speed via neural network on a dsPIC?

I would like to seek some advise on how I should go about implementing a neural network on a dsPIC to control the motor speed of a robot (if it is at all feasible). Currently, I am deploying a typical ...
19 views

### Low cost robot arm with multi-finger gripper (garment manipulation, food processing)

I am searching in Amazon and Ebay for robot arm with multi-finger gripper. I intend to make application for clothes manipulation and food processing. There are some low cost arms with price tag 30-100 ...
22 views

### Which joints to discretize for IK

I am using ikfast in OpenRave for my inverse kinematics. This is an analytical solver, so if your robot's DOF matches the IK type's DOF, then you get all possible solutions. But if your robot has ...
11 views

### Is it possible to do SLAM with few IR sensors like Buddy?

I saw Buddy's page and want to purchase for my SLAM research. However, I wonder is it possible to program Buddy for SLAM? According to Buddy's spec, they're only few IR's, sonars and a camera. As I ...
25 views

### How do I decide the size of the time steps between sensing and control actuation?

My Background: My experience is in solid mechanics and FEA. So I have zero experience in robotics/controls. Problem Description I'm developing a control strategy to stabilize a complicated ...
21 views

### Electric Motor Speed Control - PWM vs analog voltage?

I'm working on a 2-wheeled robot and have connected up a raspberry pi to an L298N motor driver. I'm sending the enable pin of a particular motor a software-generated PWM signal at 100Hz with a 50% ...
30 views

### Modeling a robot to find its position

The task of the robot is as follows. My robot should catch another robot in the arena, which is trying to escape. The exact position of that robot is sent to my robot at 5Hz. Other than that I can use ...
18 views

### Best resource to learn Robot Dynamics [on hold]

I have already attended a course in Robot Kinematics, dynamics and Control but, the way by which the dynamics part was represented was actually vague which made me misunderstand this part and the ...
25 views

### How to cut throttle signal to ESC properly?

I have a 16 Channel Servo Driver board from Adafruit (see here), and I communicate to it via I2C using a Raspberry Pi. The servo board is controlling a Qbrain by sending a PWM pulse between 1ms to 2ms ...
25 views

### Duty cycle mapping

I need to build a conversion/mapping algorithm from a controller (PID etc.) output to the duty cycle in order to command my bldc motor via esc. I couldn't do it yet because l think l dont know the ...
20 views

### Drone Battery Question

Background: 6 propeller drone w 20C 3s 6400 mAh 11.1 liPO battery 4 propeller drone w 25C 2s 5000 mAh 7.40 liPO battery Behavior: Drone 1 flies with ease Drone 2 struggles hover 2-3 inches above ...
23 views

### Blade 180QX :What does this red wire do?

I have a Blade 180QX quadrotor / quadcopter and I had to move a red wire shoved under the circuit board when I fixed a broken power wire. Now the red wire shown out straight from the circuit board is ...
41 views

### Arm Kinematic Calibration

I have a human-scale 8 DOF robotic arm and torso composed of 3D printed links*. The errors I am seeing are on the order of 3.5 cm**, despite having fairly high resolution joint encoders (12 bit). I ...
29 views

### Create a simple C++ client Application to control KUKA's Robot-arm LBR iiwa via FRI

Until now I have been programming the robot using Java on KUKA's IDE "KUKA Sunrise.Workbench", what I want to do is control the robot arm via my C++.Net application (I would use a camera or Kinect to ...
15 views

### How to make a loiter mode control for a quadcopter?

I succesfully implemented the Madgwick Algorithm to stabilize the quadcopter but i can´t make it stay still. The model is based on this equations Were b is lift force and is 10e-6 N/(rad/s)^2 ...
44 views

### Calculus in robotics [on hold]

I am still in high school and am a part of the robotics club that competes in the FTC (First Tech Challenge). I am just about finishing my first Calculus class (Calc 1), and would be ecstatic to be ...
15 views

### Communicating with Intel Galileo via ethernet

I am doing a project where we are creating a sensor node on Intel Galileo. The Intel Galileo will receive sensor data from sensors like ultrasonics etc. I want to transfer all this data to a laptop ...
50 views

### Mathematical Moddeling of Elastic Robots [on hold]

We can easily compute the rigid robot kinematics and dynamics. There is many resources, simulators and modelling tools about it. But i couldnt find any of these for elastic robots. Can you suggest ...
46 views

### Navigating through a Maze using path-planning (Dijkstra)

I'm working on an robot that would be able to navigate through a maze, avoid obstacles and identify some of the objects in it. I have a monochromatic bitmap of the maze, that is supposed to be used in ...
25 views

### How could robotics be useful for a sole individual? [on hold]

Suppose I'm not affiliated with any company and I'm just a regular person with some possible weird hobbies. What are the best uses I can make of robotics?
35 views

### Building parts, and keeping laser alignment steady

I am building a laser gun for pentathlon targets (also doing one). I would like to know how build a part of the gun and if I can count on a steady laser if it is attached to a motor. The question is ...
29 views

### Estimation of Battery Life Time From PWM Signals in a Quadrotor

Is there any way of estimation the battery life from pwm outputs which goes to motors in microcontroller level. I'm planning to estimate path range with this. Microcontroller, sensor and other ...
38 views

### Where is the best robotic resouces? [on hold]

I'm looking to start building robots. I was wondering if there are any great websites, youtube channel or books that would be helpful. In the past I've been able to find great resources for web ...
62 views

### Comparing industrial robot arms [closed]

I'd like to study the capabilities of industrial robot arms. For example, to answer the question how does price vary with precision, speed, reach and strength? Is there a database of industrial robot ...
24 views

### Is it possible to simulate vision (perception) in Gazebo (or other simulators)

Vision is important part of robotics and frequently it is unavoidable component of control loop. E.g. many clothes/garment handling algorithms rely on visual cues in deciding how to proceed. The ...
11 views

### Where to make changes for simulation project Bullet/Gazebo/ROS/Orocos

I am starting to develop robotics project which involves simulation (and maybe real world programs) of soft-body dynamics (for food processing) and clothes/garment handling (for textile industry or ...
47 views

### Determine what the rotation axis is given a rotation matrix

How do I find out around which axis the coordinate system has to rotate, if the rotation matrix is given? ${^{a}R_{b} }$ = \$ \left(\begin{matrix} 0 & 1 & 0 \\ -1 & 0 & 0 \\ 0 & ...
37 views

### MATLAB 3D Simulation with SOLIDWORKS model

I'm learning to make a 3D simulation in MATLAB based on a model designed from SOLIDWORKS. There is an example: SIMULINK+SOLIDWORKS The way used here is: Create a 3D model in SOLIDWORKS Create a ...
68 views

### What type of control law is used in “Reaction Control System” of Apollo Lunar Module or Space Shuttle?

Reaction Control Systems (RCS) on these vehicles are implemented by using small rocket thrusters. For me it looks like these thrusters work in some kind of "pulse" mode. And I can't understand - do ...
17 views

### Reading crazy large numbers from Naze32

I hope someone can help me here. I am reading very large numbers from my naze32. What is the max and min values from pitch, roll and yaw? how would I then convert them to degrees or radians?
39 views

### Optimal hardware for linear algebra operations

I've been working lately on SLAM algorithms implementing extended kalman filtering to brush up on some localisation techniques and I have been thinking forward to the hardware side of things. Are ...
41 views

### Prototyping with IRobot roomba

For a project I am building a Tele-Op Robot using the IRobot's Roomba as my drivetrain. In order for my robot to work, I need an extra castor. IRobot provides .stl and .stp files for me to use and I ...
43 views

### Formationing Algorithm for Multiple Robots

I'm looking for an algorithm for formationing multiple robots in 2D simulation. Can you suggest resources about this topic. Also I need suggestions and comments about these topics: Can I recruit ...
62 views

### How to make door opening to the top

I need to make this construction (door is closed by default, door is opened to the top). This is the scheme: Red rectangle on the picture is the aperture, blue rectangle is the door (weight is ...
35 views

### Low variance resampling algorithm for particle filter

For my particle filter, I decided to try using the low variance resampling algorithm as suggested in Probabilistic Robotics. The algorithm implements systematic resampling while still considering ...
50 views

### increase PID sampling rate on embedded system

my robotic project is running at every 1ms and the processes are taking about 0.9ms. I am running PID so my max clock rate is 1kHz. About half of the processing time are taken by SPI peripherals, IMU ...
34 views

### Voltage rpm relation

I measure the voltage ESC drawing while increasing the dc motor speed. Multimeter shows that as long as the speed increases the voltage value decreases. Can anybody explain why this is happening?
76 views

### Degree of Freedom

A robotic arm should pick a cuboid up of a table, rotate it around its vertical axis and put it down on all possible positions. How many degrees of freedom are at least necessary? (All coordinates, ...
36 views

### Is anybody using robot simulators? [closed]

Do you use simulators for developing your robot algorithms or do you test directly in your robot? I would like to get introduced into the simulators world, but don't know from where to start... can ...
99 views

### What is required to build a simple XY-stage?

In the scope of my PhD, I would like to build an automated microscopy set-up that should take images of a sample of 2cm by 2cm. This should be done by taking pictures of 500 micrometers by 500 ...
35 views

### Object Grasping Robot Arm Control [closed]

I have a 2 DOF Robot Arm with a camera attached to it. It takes an Image and there's an object in that image, say a glass. Of course, in order to move the arm to the required position to grasp the ...
19 views

### Arduino compatible sensor for motion detection [closed]

hi everyone Am working on a project that requires motion detection and positioning, I've worked substantially with camera but the issue with this is that I need something sleek, small and not heavy at ...
40 views

### How to reduce battery power 10v 1.5A to 6v 1.5A [closed]

What's least complex way to reduce power from a 10V 1.5A battery to 6V 1.5A Thank you!
11 views

### Extending iCreate battery power for auxilliary equipment

I plan to use the icreate as a platform to carry a tablet, or notebook PC and want to have power for some time so I need more than the 3000 mAh battery. I want all to be powered from same battery ...
38 views

### Kinect VS Stereo cameras [closed]

As I'm advancing in my project I realized I need better hardware, particularly for video input and processing. From an intuitive feeling sounds like stereo cameras offers a more powerful and flexible ...
46 views

### Kinect v1 VS Kinect v2

From a technical standpoint what are the differences between the Kinect v1 and the Kinect v2 ? I'm interested both in the hardware equipment and the format of the data.
40 views

### where to get this reference about Kalman filter, technical report

I'm sorry for this question that might not fit in here however, I would like to give it a shot. I've chosen this stack since the question is somehow related to mobile robots. I've came across a paper ...