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rosserial communication between bluetooth and arduino

asked 2012-07-15 06:28:57 -0600

sgwhack gravatar image

Hi,

I am trying to communicate wirelessly between an Arduino with a bluetooth shield and my computer using rosserial. When I use rosserial through the USB cable, everything works fine, but nothing works wirelessly. Also, I can send regular serial messages sometimes to Putty using the Arduino serial functions, Serial.begin(), Serial.Write(), etc. I just can't seem to make the Arduino a ROS node through bluetooth (though, as mentioned before it does work with a USB serial connection).

I setup my bluetooth connection using: sudo rfcomm bind 0 00:00:01:08:01:65 1

There is an LED on the shield that indicates when the bluetooth is connected, however the messages that I get from the terminal are:

rosrun rosserial_python serial_node.py /dev/rfcomm0 _baud:=9600

[INFO] [WallTime: 1342369406.985011] ROS Serial Python Node

[INFO] [WallTime: 1342369406.987303] Connected on /dev/rfcomm0 at 9600 baud

[ERROR] [WallTime: 1342369421.988484] Lost sync with device, restarting...

I have tried playing around with the baud rates to no avail.

Does anyone know how I can make this work?

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answered 2012-08-09 22:52:03 -0600

PaulBouchier gravatar image

rosserial_arduino sets the baud rate to 57600 on the arudino. You'll have to configure your bluetooth shield to run at 57600 on both ends, and use 57600 on rosserial_python.

Alternatively, you can get rosserial_arduino to run at 9600 baud by editing ArduinoHardware.h in <sketchbook>\libraries\ros_lib and changing the baud rate defaults in the constructors. Remember to restart the Arduino IDE after changing libraries.

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If you want to change the baudrate of your Arduino's UART, you do not necessarily have to edit `ArduinoHardware.h`. Instead, call e.g. `nh.getHardware()->setBaud(115200);` in the `setup()` function of your sketch before `nh.initNode()`. In my example, `nh` is the NodeHandle.

Tones gravatar imageTones ( 2014-03-27 03:09:52 -0600 )edit

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Asked: 2012-07-15 06:28:57 -0600

Seen: 3,504 times

Last updated: Aug 09 '12