Questions tagged [troubleshooting]

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Gazebo joint velocities do not agree with joint displacement

In a simulation that I am running, which is described below, the angular velocities that I get from the joint_states topic, do not give me the angular displacement I calculate from the joints angular ...
MIKE PAPADAKIS's user avatar
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gazebo_ros_bumper outputs contact in other frame than the one specified

I want to simulate a simple force control scheme, namely: $$ \tau = J^T F_{EE} $$ where $F_{EE}$ is the wedge from the end-effector to the environment. The base of my robot is at $(0,0,0)$ and i want ...
MIKE PAPADAKIS's user avatar
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Ros control pid gives different input than expected

I am trying to match the trajectory i am getting from gazebo simulation using ros_control and matlab for a simple pendulum which rotates in the horizontal plane (so no gravity, no friction and no ...
MIKE PAPADAKIS's user avatar
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0 answers

How does one setup an ESC to drive a wheel-hub motor?

I have 2x 350W wheel-hub motors taken from a self-balancing scooter, or hoverboard. My intention is to use the two of them to drive a homemade R2-D2. However, some difficulties have been encountered ...
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Does anyone have a working example of using Qt to communicate with NXT?

I'm stumped. I've been looking through all of the Qt classes and I'm so completely and utterly lost. There are only three examples of bluetooth use in Qt, but none of them work for me. I just need a ...
Klik's user avatar
  • 163
1 vote
0 answers

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. ...
devth's user avatar
  • 111
6 votes
1 answer

Vex motors and tank treads drained 9-volt battery more quickly than expected

I've got a couple Vex 269 Motors hooked up to an Arduino Duemilanove. These motors run a some Vex Tank Treads. I powered the whole setup with an off-brand 9-volt battery. Everything seems to run great,...
golmschenk's user avatar
  • 1,554
9 votes
4 answers

How can one determine whether a LiPo battery is going bad?

In our lab we use LiPo batteries to power our quadrotors. Lately we have been experiencing stability issues when using certain batteries. The batteries seem to charge and balance normally and our ...
DaemonMaker's user avatar
  • 3,901