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Robot Arm No Longer Connecting
02-04-2020, 11:32 PM
Post: #1
Robot Arm No Longer Connecting
Hi There.

We've made some progress on working with our SCARA arm at the high school, but have run into some trouble as well. Recently we've been unable to connect to the arm at all. We had been doing some work at modifying the Arduino code so that we could provide arm instructions based on RC controller input rather than USB or WIFI, and had a simple system that did something, but our values for ch1, 2, and 3 weren't quite correct. The last time we were able to use the arm we were connected via WIFI so that we could use the serial monitor via usb to observe the values for ch1-3 passed into the message and see how they corresponded to the x,y positions in realtime mode.

Since then, however, we continually get the ERROR - Robot Offline message when trying to activate the robot regardless of port selection in the software, actual port the cable is plugged into, or trying to connect over WIFI. Since our telemetry message system isn't done, we were planning to use the LEAP controller for our school's open house just so that we could easily show it in action and let prospective students interface with it.

We've copied the original unedited Arduino code back to the Devia board, but are still unable to bring the robot arm back to life. When reset, the arm moves through the calibration phase - we just can't connect through the control app. Any ideas why this could be?
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02-05-2020, 12:28 AM
Post: #2
RE: Robot Arm No Longer Connecting
(02-04-2020 11:32 PM)stefanscott Wrote:  Hi There.

We've made some progress on working with our SCARA arm at the high school, but have run into some trouble as well. Recently we've been unable to connect to the arm at all. We had been doing some work at modifying the Arduino code so that we could provide arm instructions based on RC controller input rather than USB or WIFI, and had a simple system that did something, but our values for ch1, 2, and 3 weren't quite correct. The last time we were able to use the arm we were connected via WIFI so that we could use the serial monitor via usb to observe the values for ch1-3 passed into the message and see how they corresponded to the x,y positions in realtime mode.

Since then, however, we continually get the ERROR - Robot Offline message when trying to activate the robot regardless of port selection in the software, actual port the cable is plugged into, or trying to connect over WIFI. Since our telemetry message system isn't done, we were planning to use the LEAP controller for our school's open house just so that we could easily show it in action and let prospective students interface with it.

We've copied the original unedited Arduino code back to the Devia board, but are still unable to bring the robot arm back to life. When reset, the arm moves through the calibration phase - we just can't connect through the control app. Any ideas why this could be?

Well, if the Pybot goes through the calibration process we can discard a board´s microprocessor fault.

Are you running any other background software while trying to connect to the Arm?

Sometimes you will need to restart the computer as the Python process stays in the computer’s memory even after closing the control APP
Does that solve the problem?

By the way: we have added the option to control the Pybot with a Xbox or Playstation controller in the latest APP release. We will publish it ASAP
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02-05-2020, 05:16 AM
Post: #3
RE: Robot Arm No Longer Connecting
Thanks for the suggestions. I'm not certain if we've restarted the computer that is connected through USB, so we'll try that first thing tomorrow. I also forgot to mention that the board WIFI is still showing up and we're able to connect the laptop to it, but just can't go further.

Also, very cool (and timely) that you've got controller support coming down the pipe. We look forward to trying that out and seeing if that might fit with our use case.

Thanks for all your work!
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02-05-2020, 10:03 AM
Post: #4
RE: Robot Arm No Longer Connecting
The Latest version of the Control APP -v32- (and info) can be found here:
https://www.jjrobots.com/pybot-control-a...uino-code/

We have created a .exe file (for Windows x64 OS systems) of this version to simplify the control of the robot.
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02-07-2020, 06:32 PM
Post: #5
RE: Robot Arm No Longer Connecting
(02-05-2020 10:03 AM)JJrobots JP Wrote:  The Latest version of the Control APP -v32- (and info) can be found here:
https://www.jjrobots.com/pybot-control-a...uino-code/

We have created a .exe file (for Windows x64 OS systems) of this version to simplify the control of the robot.

Thanks! I think it must have been a Python process still running; we were able to get the arm up and running just in time for the school's open house, and the demo with the LEAP controller was well received.

Maybe looking at the updated code for xbox controllers will help us make the changes needed for our RC controller. When it all works and is mounted on the robot base I'll be sure to share a video.
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02-08-2020, 10:13 PM
Post: #6
RE: Robot Arm No Longer Connecting
(02-07-2020 06:32 PM)stefanscott Wrote:  
(02-05-2020 10:03 AM)JJrobots JP Wrote:  The Latest version of the Control APP -v32- (and info) can be found here:
https://www.jjrobots.com/pybot-control-a...uino-code/

We have created a .exe file (for Windows x64 OS systems) of this version to simplify the control of the robot.

Thanks! I think it must have been a Python process still running; we were able to get the arm up and running just in time for the school's open house, and the demo with the LEAP controller was well received.

Maybe looking at the updated code for xbox controllers will help us make the changes needed for our RC controller. When it all works and is mounted on the robot base I'll be sure to share a video.
Yes, please. Share that video. We would love to watch it :-)
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