0
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
1
vote
1answer
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 ...
0
votes
1answer
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 ...
3
votes
1answer
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 ...
1
vote
2answers
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% ...
3
votes
1answer
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 ...
-1
votes
0answers
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
3
votes
1answer
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 ...
2
votes
1answer
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 ...
0
votes
0answers
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 ...
-2
votes
1answer
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 ...
0
votes
0answers
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 ...
-1
votes
3answers
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 ...
2
votes
2answers
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 ...
-1
votes
0answers
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?
0
votes
1answer
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 ...
0
votes
1answer
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 ...
-3
votes
0answers
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 ...
-2
votes
1answer
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 ...
0
votes
1answer
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 ...
2
votes
0answers
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 ...
4
votes
2answers
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 & ...
3
votes
1answer
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 ...
5
votes
1answer
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 ...
0
votes
0answers
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?
2
votes
1answer
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 ...
3
votes
2answers
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 ...
0
votes
1answer
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 ...
2
votes
1answer
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 ...
2
votes
1answer
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 ...
2
votes
1answer
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 ...
1
vote
2answers
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?
3
votes
3answers
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, ...
0
votes
1answer
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 ...
2
votes
1answer
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 ...
-1
votes
1answer
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 ...
-1
votes
1answer
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 ...
-1
votes
1answer
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!
2
votes
1answer
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 ...
0
votes
1answer
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 ...
1
vote
1answer
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.
0
votes
1answer
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 ...
3
votes
3answers
53 views

What actuator types exist that remain locked in their last position like hydraulic piston?

I would like to find an electronic actuator that mimics the characteristics of a hydraulic actuator, in that the position remains fixed without power drain when the actuator is not moving. Which ...
1
vote
2answers
96 views

How do I work out the specifications of motors and propellers for a quadcopter?

What will be the specifications of motors and propellers that can approx produce a thrust of 100kg in a quadcopter? We are planning to lift a total weight of 50 Kg along with the 20 Kg weight of the ...

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