DrWino

I have a IMU2 with ethernet brick + master brick. I want to connect directly to just the IMU2 over USB. I use python but I cannot find an example with USB connection. Everything is IP. Can you helps?

OK. I performed the updates and the program works fine now. Thanks.

Ok. imu brick is FW 2.0.4

Red binding python is 2.1.8

I am using python on red board to get data from brick imu v2. It works fine but I want to set the sensor fusion mode to 2 ( no magnetometer) But I get following error:

  File "server_v2.py", line 23, in <module>

    mode = imu.get_sensor_fusion_mode()

AttributeError: BrickIMUV2 instance has no attribute 'get_sensor_fusion_mode'

Exception in thread Callback-Processor (most likely raised during interpreter shutdown):

What am I doing wrong ? program attached. Help appreciated.

server_v2.py

When I connect to the imu2.0 brick and click calibration I get red indication on magnetometer. All other green. When I move the imu 2.0 around a bit I get green on the magnetometer but now red on SYSTEM. This does not go away so I cannot save this this calibration. What is the correct procedure ?

Look - it kind of silly to argue with a customer over a 1 euro part but you are wrong. I have attached a photo of the kit as it cam. Also you can see that the hex section of the spacers is the same - regardless of M/F or F/F. The length is 10 mm. Next to it I show my spacers which has a hex section length of 12mm. It fits the bricks correctly.

Sorry. All the 8 spacers in the 2 kits are 10mm. I purchased them along with the bricks on the same webpage. In any event I found 12mm spacers in my workshop so no problem but you should fix this for other customers.

Interesting. I can provide absolute heading by dual RTK-GPS so perhaps it might be better to not use the magnetometer at all but use this absolute heading periodically to adjust the imu. If you have and ideas or example code I would be grateful. I will look at the API and see how it works. On another note - what is the minimum voltage acceptable to power the ethernet POE ? It needs to support this + red brick + imu. Thanks.

I purchased spacer mounting kits with my brick but they are too short. The spacing between the brick boards is 12.5mm but the spacers are 10 mm ! I kno it is only a few euro but a waste.

I have been successful in making an ethernet imu server using red brick+imu 2.0 + ethernet POE brick. Works really great ! Thanks. My question is how to calibrate the compass to take care of metal disturbances and EMF caused by the vehicle ? How good is the imu with vibration ?

IMHO - it is not possible to perform position odometry accurately using just a compass/IMU. You need a positional reference - such as GPS. I have been following your work and really RTK is the way to go with dual-RTK for heading. I have also build such a system and it works well. The real problem is continued operation when RTK is momentarily lost. This is where I am hoping the IMU may come in handy.

-> borg. Thanks.Two issues concern me 1) I could use the ROS package on github by gus484. I have compiled this but it needs brickd to run. I need to figure out how to install brickd in a non-graphics ubuntu distro. 2) I really want the IMU to be standalone - which is why I got the red brick+ethernet. I can write my own ROS node but I have not been able to find a python example which shows how to access the IMUv2 over ethernet. It is also my understanding that this could a standalone system publishing ROS messages without the need for brickd. Any similar example would be a great help.

I have now a red brick, imu2 and POE ethernet brick. What I want to do is make a ROS node that will publish IMU data over ethernet to another computer running ROS. Has anybody done this and and any tips ?

Thanks