Mind_hunter's profile - activity

What is the minimum system requirement for ROS? I want to install ROS on TS-7260 and it has the following configuration:
200Mhz ARM9 CPU with MMU
32 MB on-board NAND flash (128 MB optional)
32 MB SDRAM (64 or 128 MB optional)
I am booting it with Debian OS and want to install ROS over it . So will it work well on it ?

@miguel ..I think i downloaded the source and build it ....Here is the link of source code of diagnostic and other messages. https://github.com/ros/common_msgs

@miguel ..I think i downloaded the source and build it ....Here is the link of source code of diagnostic and other messages. https://github.com/ros/common_msgs

sudo pip -r install rosdep....i tried with -r and i think my problem was solved because of that ...not very sure but u can try that .

ya right i am looking for drawing a value of a numeric message type vs time .

Sorry i was talking about the value of message variable with respect to time not ros parameter. I think i should have used topic/message value instead of word "parameter".

Is there any tool integrated with ROS which can be used to draw a graph showing a parameter change with time? Thanks in advance.

I thought if it send message data then only it encodes it , like in case when we advertise a topic....So does it encode the normal message also before sending it through serial?

I am accessing ros messages in arduino by serializing it through ros serial. But when i am sending some text from arduino code through serial it is showing different output in serial monitor of arduino ide. Seems all the text have mixed with some other data .What can be possible reason?Thanks

Thanks.I have to send the messages from raspberrypi to arduino through rosserial . How to access the checksum value from the packet. According to the link u have given above,does size of a packet of N byte message data is N+8 bytes

I want to check whether data send by the publisher is the same as received by the subscriber. So is this check already done by the ROS or i have to use CRC , checksum like methods within the messages to ensure that data is correct .

Right ..whole common_msgs stack was not installed . Now it is running well ..Thanks .

I have installed rosserial on raspberry pi according to the instructions given in the following link
http://wiki.jigsawrenaissance.org/ROS...
On running roslaunch rosserial_server serial.launch port:=/dev/ttyACM0 following is showing ....

pi@raspberrypi ~ $ roslaunch rosserial_server serial.launch port:=/dev/ttyACM0
... logging to /home/pi/.ros/log/f8109b02-82a0-11e4-83ef-b827eb8371f7/roslaunch-raspberrypi-4607.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://raspberrypi:55941/

SUMMARY
========

PARAMETERS
 * /rosdistro
 * /rosserial_server/port
 * /rosversion

NODES
  /
    rosserial_message_info (rosserial_python/message_info_service.py)
    rosserial_server (rosserial_server/serial_node)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[rosserial_server-1]: started with pid [4653]
process[rosserial_message_info-2]: started with pid [4683]
Traceback (most recent call last):
  File "/home/pi/catkin_ws/src/rosserial/rosserial_python/nodes/message_info_service.py", line 46, in <module>
    from rosserial_python import load_message
  File "/home/pi/catkin_ws/devel/lib/python2.7/dist-packages/rosserial_python/__init__.py", line 34, in <module>
    exec(__fh.read())
  File "<string>", line 1, in <module>
  File "/home/pi/catkin_ws/src/rosserial/rosserial_python/src/rosserial_python/SerialClient.py", line 50, in <module>
    import diagnostic_msgs.msg
ImportError: No module named diagnostic_msgs.msg
[rosserial_message_info-2] process has died [pid 4683, exit code 1, cmd /home/pi/catkin_ws/src/rosserial/rosserial_python/nodes/message_info_service.py __name:=rosserial_message_info __log:=/home/pi/.ros/log/f8109b02-82a0-11e4-83ef-b827eb8371f7/rosserial_message_info-2.log].
log file: /home/pi/.ros/log/f8109b02-82a0-11e4-83ef-b827eb8371f7/rosserial_message_info-2*.log

What is the error? Thanks in advance

" Sync with device lost." this is showing

Ok , I have uncommented it but still server is not getting the client request .

I started a service in ubuntu and want to connect arduino as a client..
Here is my code for arduino.

 #include <ros.h>
#include <std_msgs/String.h>
#include <demo/AddTwoInts.h>

ros::NodeHandle  nh;
using demo::AddTwoInts;

ros::ServiceClient<AddTwoInts::Request, AddTwoInts::Response> client("add_two_ints");

std_msgs::String str_msg;
//ros::Publisher chatter("chatter", &str_msg);

char hello[13] = "hello world!";

void setup()
{
  nh.getHardware()->setBaud(57600); 
  nh.initNode();
  nh.serviceClient(client);
  //nh.advertise(chatter);
  //while(!nh.connected()) nh.spinOnce();
  nh.loginfo("Startup complete");
}

void loop()
{
  AddTwoInts::Request req;
  AddTwoInts::Response res;
  req.a = 10;
  req.b = 20;
  client.call(req, res);
  //str_msg.data = hello;
  //chatter.publish( &str_msg );
  //nh.spinOnce();
  delay(500);
}

How to proceed further so as to use the ros service. On using the line , rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 following error was showing..

[INFO] [WallTime: 1418362019.535645] ROS Serial Python Node
[INFO] [WallTime: 1418362019.546370] Connecting to /dev/ttyACM0 at 57600 baud
[ERROR] [WallTime: 1418362036.655201] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino