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2016-10-10 13:37:52 -0500 commented question Low frequency (NXT-ROS with USB)

Well, it was along time ago and I don't remember exactly what we did. I don't know the state of NXT-ROW nowadays either. However I do remember that at the and we did some changes to a file (nxt.py or similar) to remove a wait time that had no reason and to remove some other things we didn't need

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2015-03-27 06:25:42 -0500 asked a question joint_states_aggregator and joint_state_publisher

Hello,

I'm working with NXT-ROS. I have created an application and when i was running the rxgraph I realized that there is a node i don't know: joint_state_publisher. I think it isn't part of the NXT software, but part of basic ROS. I don't really know what it does, I know it is subscribed to a topic called joint_state and that it publishes another topic called joint_states. In the wiki it just says that publishes a JointState type of message where all the joints are defined. I think it might be that it receives information from the node nxt_ros about each of the sensors and it publishes all in a single topic.

Related to this, I thought that this was what the node joint_states_aggregator did.

2015-03-27 05:49:59 -0500 asked a question Which node reads the configuration file?

Hello,

I am working with NXT-ROS. To define the sensors and actuators, you need to create a robot.yaml file. My question is, how is this file used? Is it read by some other node? By which?

I think it might be the node nxt_ros, but i am not really sure.

Thanks

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2015-02-18 07:23:46 -0500 asked a question Low frequency (NXT-ROS with USB)

Hello,

I'm trying to work on NXT-ROS using the USB. Right now I'm using an ultrasonic sensor, a color sensor and two servomotors. The problem is that I only get very low frequencies (~10Hz). If I raise the frequency of my sensors (for example up to 15Hz) I get something like this:

[WARN] [WallTime: 1424265476.725277] color_sensor not reaching desired frequency: actual 1.485489, desired 15.000000
[WARN] [WallTime: 1424265476.727759] ultrasonic_sensor not reaching desired frequency: actual 9.011199, desired 15.000000

I need a higher frequency for my application, but I don't know what is the problem.

I've read that there are some problems with frequency using the Bluetooth, but not with USB.

2015-02-05 08:44:24 -0500 asked a question What is the intensity sensor? (NXT)

Hello,

I was doing the tutorials for NXT robots. In the second tutorial, you are proposed to create a model robot, with just some sensors and motors. One of the sensors they mention is Intensity Sensor.

This makes me feel a bit confused. I do not see this sensor in the list of sensors of LEGO NXT Mindstorms. The only ones that I think it could be are the Light Sensor and the Color Sensor. At the beginning I thought it was the light sensor, but it did not work.

So, what is exactly the thing they call Intensity Sensor?

Thanks

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2015-01-30 06:33:08 -0500 asked a question Does not recognize command roscreate-pkg! (NXT-ROS)

Hello,

I'm trying to build a NXT-ROS robot. I was following the tutorials. The first one is about to testing a sensor, but it also explains how to create a new package. The problem is that when I type:

roscd nxt
roscreate-pkg learning_nxt rospy nxt_ros

it says me that it does not recognize the instruction roscreate.

In the tutorial, below these instructions it says: Note: This instruction refers to a source-based installation. If you installed nxt system-wide (i.e. under /opt/ros/), you should create a local overlay for your packages.

I think this might be my problem. I found this: http://docs.ros.org/independent/api/r...

Following this tutorial I've build a new workspace, but when I try to use back the instructions of the tutorial for NXT-TOS (the ones I said before) I keep having the same trouble. I think it might be because I keep opening the same directory, but I don't know what I need to do to work on the workspace I created.

If it helps, I'm using electric and the workspace I've created is in ~/electric

Thanks