<div dir="ltr"><div>Hi Chris,</div><div><br></div><div>I also have a QTPy connected to a BNO055 and would like to have the information accessible to the RPi.</div><div><br></div><div>It was interesting to hear of the communication you have built between the RPi4 and QTPy.</div><div><br></div><div>If you have any pointers on how to accomplish this, will appreciate it. Thanks.</div><div><br></div><div>Regards.</div><div>- Kumar</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Sep 26, 2021 at 4:12 PM Chris N <<a href="mailto:netterchris@gmail.com">netterchris@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div style="font-size:x-small"><br></div></div><div style="font-size:x-small">Kumar,</div><div style="font-size:x-small"><br></div><div style="font-size:x-small">I'm using ROS1 on a Pi 4 under Raspberry Pi OS. You basically have 3 options. </div><div style="font-size:x-small"><br></div><div style="font-size:x-small">1) Use Ubuntu instead of Raspberry Pi OS. <br></div><div style="font-size:x-small"><br></div><div style="font-size:x-small">That's probably the most convenient and most "turn key" route, because after a few basic prerequisite steps, any ROS package is basically just an "apt instal xyz" away. That's what the instructable is doing. What you give up is a bit of performance. Last time I tried Ubuntu 20.04, I noticed some definite performance disadvantages compared to Raspberry Pi OS. I think my Python code was simply using a lot more CPU. Not to the point where it is a show-stopper, but it just bothered me. I was concerned that I would discover additional performance issues. Basically, Ubuntu does not seem to be as optimized for the RPi hardware, as Raspberry Pi OS.<br></div><div style="font-size:x-small"><br></div><div style="font-size:x-small">2) Run Ubuntu 20.04 inside a docker container on top of Raspberry Pi OS. <br></div><div style="font-size:x-small"><br></div><div style="font-size:x-small">There are docker images readily available that are already set up with ROS. Since a docker container is just a fancy "sandbox" and not a full blown VM, you don't necessarily lose much performance. It's not very space efficient though. It "costs" you a couple of GB of storage, because you basically end up installing a good chunk of Ubuntu. But who cares. uSD cards are cheap. I have this currently on my Pi 4, but have not found myself using it as much as option 3) below, mainly because of the added complexity and minor gotchas associated with docker. I'm struggling enough as it is to remember all the things I need to remember with ROS, and now I need to also remember (or look up) how to do things with docker? <br></div><div style="font-size:x-small"><br></div><div style="font-size:x-small">3) Build ROS from scratch for Raspberry Pi OS.</div><div style="font-size:x-small"><br></div><div style="font-size:x-small">I have done this with ROS Melodic and I'm currently using that install. I'm not 100% sure if it is possible with ROS Noetic (i.e. latest ROS1), and maybe that's why I pursued route #2 at one stage.</div><div style="font-size:x-small">Is this what you tried so far? This is a bit tricky. The build, which takes forever, fails at one point (which is expected), and then one has to tweak a few things and restart the build etc. etc. There is a convoluted sequence of steps one has to execute to add a ROS package, etc. etc. (I actually found it easier to git clone certain ROS packages into the catkin_ws, rather than follow the procedure for adding them into /opt/ros install folder)<br></div><div style="font-size:x-small"><br></div><div style="font-size:x-small"><div style="font-size:x-small">Let me know which option you tried pursuing!<br></div></div><div style="font-size:x-small"><br></div><div style="font-size:x-small">Chris.</div><div style="font-size:x-small"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Sep 26, 2021 at 3:34 AM Thalanayar Muthukumar via DPRGlist <<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Thanks Doug. I will check this out.<div>I have tried various things but not succeeded yet.</div><div><br></div><div>Regards.</div><div>- Kumar<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Sep 26, 2021, at 1:10 AM, Doug Paradis <<a href="mailto:paradug@gmail.com" target="_blank">paradug@gmail.com</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Kumar,<div> You might find this Instructable useful:<a href="https://www.instructables.com/Using-RPlidar-With-Robot-Navigation/" target="_blank"> https://www.instructables.com/Using-RPlidar-With-Robot-Navigation/</a>.</div><div>Regards,</div><div>Doug P.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 25, 2021 at 11:58 PM Doug Paradis <<a href="mailto:paradug@gmail.com" target="_blank">paradug@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Kumar,<div> Harold has worked with ROS2. I believe Chris has worked with ROS1. They generally are present at RBNV on Tuesday. </div><div><br></div><div>Regards,</div><div>Doug P. </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 25, 2021 at 10:50 PM Thalanayar Muthukumar <<a href="mailto:tnkumar@gmail.com" target="_blank">tnkumar@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Doug,</div><div><br></div><div>I am going with ROS1 as I have heard it is the stable release.</div><div>Would you propose to go with ROS2?</div><div><br></div><div>Regards.</div><div>- Kumar</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 25, 2021 at 9:17 PM Thalanayar Muthukumar <<a href="mailto:tnkumar@gmail.com" target="_blank">tnkumar@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">ROS1</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 25, 2021 at 9:00 PM Doug Paradis <<a href="mailto:paradug@gmail.com" target="_blank">paradug@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Kumar,<br><div> Are you planning to use ROS2 or ROS1?</div><div>Regards,</div><div>Doug P.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 25, 2021 at 8:29 PM Thalanayar Muthukumar via DPRGlist <<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I figured this out by using instructions from Exomy software instructions … <br>
<br>
Sent from my iPhone<br>
<br>
> On Sep 25, 2021, at 5:32 PM, Thalanayar Muthukumar <<a href="mailto:tnkumar@gmail.com" target="_blank">tnkumar@gmail.com</a>> wrote:<br>
> <br>
> I am struggling with installing ROS on RPI4. I guess there are some dependencies with Ubuntu images that should be used. Has anybody done this and can provide guidance? I want to subsequently connect RPLIDAR A1M8<br>
> <br>
> Regards.<br>
> - Kumar<br>
> <br>
> Sent from my iPhone<br>
> <br>
>> On Sep 25, 2021, at 4:24 PM, <a href="mailto:dprglist-request@lists.dprg.org" target="_blank">dprglist-request@lists.dprg.org</a> wrote:<br>
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>> 1. Re: ChiBot RoboMagellan videos from 2010-2012 (<a href="mailto:jsampson@pobox.com" target="_blank">jsampson@pobox.com</a>)<br>
>> 2. Who Knew? The Most Important Device In The Universe Is<br>
>> Powe? (Carl W Ott Jr)<br>
>> <br>
>> <br>
>> ----------------------------------------------------------------------<br>
>> <br>
>> Message: 1<br>
>> Date: Fri, 24 Sep 2021 23:29:19 +0000 (UTC)<br>
>> From: "<a href="mailto:jsampson@pobox.com" target="_blank">jsampson@pobox.com</a>" <<a href="mailto:jsampson@pobox.com" target="_blank">jsampson@pobox.com</a>><br>
>> To: "<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a>" <<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a>><br>
>> Subject: Re: [Dprglist] ChiBot RoboMagellan videos from 2010-2012<br>
>> Message-ID: <<a href="mailto:807121260.773830.1632526159852@mail.yahoo.com" target="_blank">807121260.773830.1632526159852@mail.yahoo.com</a>><br>
>> Content-Type: text/plain; charset="utf-8"<br>
>> <br>
>> I have two older ChiBots Robomagellan videos on my YouTube channel from 2009.<a href="https://www.youtube.com/user/jws8675309/videos" rel="noreferrer" target="_blank">https://www.youtube.com/user/jws8675309/videos</a><br>
>> Jeff Sampson<br>
>> <br>
>>> Message: 1<br>
>>> Date: Wed, 22 Sep 2021 21:37:59 -0500<br>
>>> From: Doug Paradis <<a href="mailto:paradug@gmail.com" target="_blank">paradug@gmail.com</a>><br>
>>> To: DPRG <<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a>><br>
>>> Subject: [Dprglist] ChiBot RoboMagellan videos from 2010-2012<br>
>>> <br>
>>> Several years ago I watched these videos hosted from the old ChiBot<br>
>>> website. They show a nice variety of robots with different levels of<br>
>>> success. They motivated me to start to build my own rover. I thought that<br>
>>> when the ChiBot club website went dark, the videos were lost. I believe the<br>
>>> club died. However, searching around tonight I found the playlist at<br>
>>> <a href="https://www.youtube.com/playlist?list=PLJpO4U4ErJiwNC2Dzm36eEW2S89NSG9gS" rel="noreferrer" target="_blank">https://www.youtube.com/playlist?list=PLJpO4U4ErJiwNC2Dzm36eEW2S89NSG9gS</a>.<br>
>>> <br>
>>> If you need some inspiration for the next RoboColumbus, check them out.<br>
>>> <br>
>>> BTW, ChiBots seems to have been restarted. I wish them luck.<br>
>>> <br>
>>> Regards,<br>
>>> Doug P.<br>
>> <br>
>> <br>
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>> ------------------------------<br>
>> <br>
>> Message: 2<br>
>> Date: Sat, 25 Sep 2021 15:06:07 -0500<br>
>> From: Carl W Ott Jr <<a href="mailto:carl.ott.jr@gmail.com" target="_blank">carl.ott.jr@gmail.com</a>><br>
>> To: DPRG D-List <<a href="mailto:dprglist@dprg.org" target="_blank">dprglist@dprg.org</a>><br>
>> Subject: [Dprglist] Who Knew? The Most Important Device In The<br>
>> Universe Is Powe?<br>
>> Message-ID: <<a href="mailto:7AA798A6-7123-45A3-A04F-ABC0381ABCD1@gmail.com" target="_blank">7AA798A6-7123-45A3-A04F-ABC0381ABCD1@gmail.com</a>><br>
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>> <a href="https://hackaday.com/2021/09/23/the-most-important-device-in-the-universe-is-powered-by-a-555-timer/" rel="noreferrer" target="_blank">https://hackaday.com/2021/09/23/the-most-important-device-in-the-universe-is-powered-by-a-555-timer/</a><br>
>> <br>
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