Arduino rosserial - Unable to sync with device

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I had the same problem, this procedure solve it:

1. Go to Arduino IDE -> Tools -> Programmer -> Select: Arduino as ISP

2. Upload using programmer

   ctrl + shitf + u (or click file -> upload using programmer)

3. Upload an example code (pubsub is a good one to debug this kind of problems)

   click file -> examples -> ros_lib -> pubsub

4. make sure your arduino exists:

   ls /dev/ttyACM0

5. make sure your user has access to dialout group:

   sudo adduser my_user_name dialout

6. run

   roscore

   rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=57600

Hi! I also encountered the same problem and fixed it finally. It displays "Connecting to /dev/ttyACM0 at 57600 baud" while the baud rate in my Arduino code was set to be 115200. Hence, set the baud rate as it was in your arduino code (In my case it is 115200) by adding_baud:=X (where 'X' is the baud rate between your computer and the Arduino) to the same command as follows:

rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200

The other reason could be that your port is different from that of the above command. For example, check if your port to which the Arduino is connected, is as entered in the above command i.e, ttyACM0 or ttyACM1 etc .

Hope this helps!

Hi, Initialize the ros handle with the same baud rate in your Arduino code nh.getHardware()->setBaud(BAUD) Something like this

   void setup() {
      Serial.begin(115200);
      nh.getHardware()->setBaud(115200);
      nh.initNode();

Once you are done uploading, start roscore and then type

rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200

Make sure your port and baud rate are same.

Your problem might be related to this issue: https://github.com/ros-drivers/rosser...

I am encountering this problem with ubuntu 14.04 and different kernel versions (3.10.96, 3.13.0, 3.16.0).

I found three possible workarounds:

• Use the current xenial kernel (version 4.4.0) with ubuntu 14.04 (DISCLAIMER: This is a serious change in your system and might cause trouble such as driver incompatibilities)
• Start the serial_node with baud rate 0, exit and restart the serial node with the correct baud rate. You have to repeat this every time the error occurs.
• Modify SerialClient.py according to the suggestion of kvogt

Just adding another possibility for this error to occur: I wrote a simple publisher and ran into this error. After adding a spinOnce to my loop function, it disappeared.

i solved the problem using arduino mega.i think problem is not cable or package.its buffer size.

I encountered this issue after installing ros serial library from the arduino IDE. It was fixed by installing ros_lib instead from: http://wiki.ros.org/rosserial_arduino...

You will also need to delete the library that you installed from the arduino IDE.

Another issue could be your version of genpy. In that case simply run the following:

$ sudo apt-get install ros-<distro>-genpy

This problem is commonly seen when there is an error in the baud rate that Arduino serial takes. The commonly used baud rates are 9600, 57600, and 115200. so you can try changing the baud rates which is working with you by the following command

rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=9600

(note : ensure your port is /dev/ttyACM0 . If not try others like /dev/ttyACM1)