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  3.    xmlns:content=""
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  6.    <channel>
  7.        <title>Robotics — Parallax Forums</title>
  8.        <link></link>
  9.        <pubDate>Sat, 09 Dec 2023 01:34:45 +0000</pubDate>
  10.        <language>en</language>
  11.            <description>Robotics — Parallax Forums</description>
  12.    <atom:link href="" rel="self" type="application/rss+xml"/>
  13.    <item>
  14.        <title>Encoder signals</title>
  15.        <link></link>
  16.        <pubDate>Fri, 24 Nov 2023 04:03:14 +0000</pubDate>
  17.        <category>Robotics</category>
  18.        <dc:creator>jdolecki</dc:creator>
  19.        <guid isPermaLink="false">175603@/discussions</guid>
  20.        <description><![CDATA[<p>My scorbot has encoders on each axis.</p>
  22. <p>They are described as phototransistors.<br />
  23. I have no info on them</p>
  25. <p>They are powered by 5v with a 39 ohm resistor to limit current.</p>
  27. <p>My signal is not a clean square wave as the manual says.</p>
  29. <p>What could be the issue? <br /><img src="" alt="" title="" /><br /><img src="" alt="" title="" /></p>
  30. ]]>
  31.        </description>
  32.    </item>
  33.    <item>
  34.        <title>Next large robot</title>
  35.        <link></link>
  36.        <pubDate>Mon, 14 Nov 2011 14:18:24 +0000</pubDate>
  37.        <category>Robotics</category>
  38.        <dc:creator>DiverBob</dc:creator>
  39.        <guid isPermaLink="false">135857@/discussions</guid>
  40.        <description><![CDATA[I've started the design work on my next creation which will be a bit different than the last few I've built. This robot will be a Hexapod based on a circular body. Each leg will have 3 drive motors and will use a design similar to the old Odex I (look it up if the name isn't familiar!). All moving parts will be on bearings or bushings, there will be 24 per leg. Linear actuators drive two axis and the third uses a large gear motor.<br /><br />
  41. I built a wooden version of one leg to validate the design,clearances and interferences. The CAD drawings were finished last night so the next step is cutting out the aluminum stock. Then it all goes into a CNC mill to make the parts!<br /><br />
  42. I'm using Parallax parts as much as possible but some things like the linear actuators were ordered elsewhere. The HB-25 motor controllersl are used to drive the 12 volt motors and 6 custom propellor boards will be used to control the legs. These controllers will be networked together with a master prop board running the show. The goal is to get the mechanical parts for a single leg together before the end of the year and have the basic individual leg programming completed before spring. I expect the final weight of the robot to be around 125 pounds and it will stand up to a maximum of around 4.5 ft.<br /><br />
  43. The rest of the legs will follow shortly after that (nice thing about a CNC is that design changes are easy to incorporate and reproduce!). I plan on using Rodney Brooks's behavioral programming ideas for this robot. So I have a lot of studying to do. My big goal is for it to be able to climb stairs with a minimum of input from myself. If I can do that, then it will be a success for me!<br /><br />
  44. This is actually my second Hexapod using this basic design but with access to better machining (CNC) capabilities and more modern electronics I expect to have more success this time around (the original was built in the 80's and had very limited capabilities)<br /><br />
  45. I'll add photos as I go along if anyone is interested.<br /><br />
  46. Bob]]>
  47.        </description>
  48.    </item>
  49.    <item>
  50.        <title>P2/Brushless motor robot build</title>
  51.        <link></link>
  52.        <pubDate>Sun, 03 Sep 2023 18:45:08 +0000</pubDate>
  53.        <category>Robotics</category>
  54.        <dc:creator>Brian_B</dc:creator>
  55.        <guid isPermaLink="false">175498@/discussions</guid>
  56.        <description><![CDATA[<p><img src="" alt="" title="" /></p>
  57. ]]>
  58.        </description>
  59.    </item>
  60.    <item>
  61.        <title>Tank Bot attempts figure 8 (for Erco!)</title>
  62.        <link></link>
  63.        <pubDate>Sat, 30 Sep 2023 18:59:52 +0000</pubDate>
  64.        <category>Robotics</category>
  65.        <dc:creator>Rayman</dc:creator>
  66.        <guid isPermaLink="false">175544@/discussions</guid>
  67.        <description><![CDATA[<p>Doesn't @erco have a figure 8 challenge thread here somewhere?  Can't find it...</p>
  69. <p>Anyway, thought good way to test out this BoeBot frame modified with the Parallax tank treads.<br />
  70. Mostly as a test for revised P2 Bot Board that happens to have correct dimensions to drop in for P1 BOE.</p>
  72. <p>Mostly a test to see if single battery pack could power P2 and servos without rebooting or other issues...<br />
  73. Seems OK.  Not the best figure 8, but I'm out of time for today...</p>
  75. <p><a href="" rel="nofollow"></a></p>
  77. <p>P2 Spin2 source attached.  Tested with Prop Tool.</p>
  78. ]]>
  79.        </description>
  80.    </item>
  81.    <item>
  82.        <title>Arlo 2.0</title>
  83.        <link></link>
  84.        <pubDate>Wed, 06 Sep 2023 12:52:54 +0000</pubDate>
  85.        <category>Robotics</category>
  86.        <dc:creator>Brian_B</dc:creator>
  87.        <guid isPermaLink="false">175508@/discussions</guid>
  88.        <description><![CDATA[<p>This is my long term robotic project, an Arlo on steroids. It has 2 propellers for the drive system and is running ROS2 on a Jetson Nano to control it.</p>
  90. <p><img src="" alt="" title="" /></p>
  91. ]]>
  92.        </description>
  93.    </item>
  94.    <item>
  95.        <title>DogBot</title>
  96.        <link></link>
  97.        <pubDate>Mon, 04 Sep 2023 18:23:02 +0000</pubDate>
  98.        <category>Robotics</category>
  99.        <dc:creator>Rayman</dc:creator>
  100.        <guid isPermaLink="false">175499@/discussions</guid>
  101.        <description><![CDATA[<p>It's walking better now.<br />
  102. Adding a bunch of caps to the P2 board lets it go a little while cord free.<br />
  103. Need to add a LiPo battery for the P2 though, so has it's own power.<br />
  104. Sharing four AA battery pack with servos isn't a good idea...</p>
  106. <p>P2 is calculating the servo angles in real time using inverse kinematics.<br />
  107. Seems OK, but maybe I'll have it populate arrays of angles and use that instead for more precision.<br />
  108. It's a little shaky and want to try and fix that...</p>
  110. <p><a href="" rel="nofollow"></a></p>
  112. <p>After that, need to see if there's a way to make it change direction on purpose.<br />
  113. Not exactly sure how to do that...</p>
  114. ]]>
  115.        </description>
  116.    </item>
  117.    <item>
  118.        <title>Robot Zen Garden</title>
  119.        <link></link>
  120.        <pubDate>Sat, 26 Nov 2022 17:44:00 +0000</pubDate>
  121.        <category>Robotics</category>
  122.        <dc:creator>erco</dc:creator>
  123.        <guid isPermaLink="false">175021@/discussions</guid>
  124.        <description><![CDATA[<p>This guy has a great Youtube channel, lots of car stuff and this! Too much time on his hands...</p>
  126. <p><span data-youtube="youtube-sTk6hyhYtYw?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span></p>
  127. ]]>
  128.        </description>
  129.    </item>
  130.    <item>
  131.        <title>Key Fob Remote (#700-10016) wire connection</title>
  132.        <link></link>
  133.        <pubDate>Sun, 18 Jun 2023 14:07:39 +0000</pubDate>
  134.        <category>Robotics</category>
  135.        <dc:creator>LMVL</dc:creator>
  136.        <guid isPermaLink="false">175408@/discussions</guid>
  137.        <description><![CDATA[<p>Hi application engineers and hobbyists,</p>
  139. <p>I am going to use a Key Fob Remote (#700-10016) to control a stepper motor, two keys for forward and backward movement controls, other two keys for speed-up/down controls.</p>
  141. <p>The Key Fob receiver guide has a description, table, and drawing as shown below, I am confused with the use of VT.  The description gives an option to select VT or D, however, both the table and the drawing show that VT should be used together with D. The remote has only 4 keys, D1 through D4 should work for the 4 keys, why is VT pin there connecting other D pins?</p>
  143. <p>Description<br /><img src="" alt="" title="" /><br />
  144. Table<br /><img src="" alt="" title="" /><br />
  145. Drawing<br /><img src="" alt="" title="" /></p>
  147. <p>The attached file is the guide.</p>
  149. <p>I have a wire connection drawing included below for my project, I left VT unconnected.  Three 9 V rechargeable batteries (8.2-8.4 V at full charge) are used to power a stepper motor that is rated for 24V use. A resistor divider is used to split the voltage to power the wireless receiver, providing 5.66-3.45 V  to the receiver for the battery voltage range of 24.9 - 15 V. The motor controller has only 3 digital pins, I have to use an analog pin as a digital pin for my project.<br /><img src="" alt="" title="" /></p>
  151. <p>Could I trouble you to check if the wire connections are OK?</p>
  153. <p>Thanks,<br />
  154. Gu</p>
  155. ]]>
  156.        </description>
  157.    </item>
  158.    <item>
  159.        <title>Scribbler 2 not working</title>
  160.        <link></link>
  161.        <pubDate>Sat, 29 Apr 2023 21:07:16 +0000</pubDate>
  162.        <category>Robotics</category>
  163.        <dc:creator>emmie234</dc:creator>
  164.        <guid isPermaLink="false">175334@/discussions</guid>
  165.        <description><![CDATA[<p>Recently my Dad (who is on staff at a university) found a Scribbler 2 in the trash. The Scribbler 2 was in its original box and on the box was written "BAD ROBOT". The Scribbler does turn on, but all wants to do is flash the three red LEDs. I currently think it is a software problem and not a hardware problem because a few times when I turned it on it did move a little bit. When I get a USB-to-serial adapter I am going to try to restore the Scribbler factory program. If the restore does not fix the problem what should I try next?</p>
  166. ]]>
  167.        </description>
  168.    </item>
  169.    <item>
  170.        <title>Arlo replacement parts</title>
  171.        <link></link>
  172.        <pubDate>Mon, 01 May 2023 02:11:14 +0000</pubDate>
  173.        <category>Robotics</category>
  174.        <dc:creator>dbe11</dc:creator>
  175.        <guid isPermaLink="false">175337@/discussions</guid>
  176.        <description><![CDATA[<p>I'm trying to build an Arlo, but many of the parts are no longer available, for example, the power distribution board. Can I purchase or download the Gerber files to make my version?</p>
  177. ]]>
  178.        </description>
  179.    </item>
  180.    <item>
  181.        <title>Balancing Car Project Attempt number 99</title>
  182.        <link></link>
  183.        <pubDate>Thu, 23 Feb 2023 23:08:08 +0000</pubDate>
  184.        <category>Robotics</category>
  185.        <dc:creator>iseries</dc:creator>
  186.        <guid isPermaLink="false">175221@/discussions</guid>
  187.        <description><![CDATA[<p>Over the number of years now I have been dabbling with make a balancing robot work with the P1. I seem to always get hung up on the timing with the Gyro Scope and the Accelerometer.</p>
  189. <p>Anyway the other day I came across this chassis that look nice and was fairly inexpensive.<br /><img src="" alt="Balance Chassis" title="" /></p>
  191. <p>Now how do I drive this thing. Parallax sells a motor driver MC33926 for $90 dollars. What that's a little steep for a motor controller. I check from the manufacturer's website and it sells for $65 there. Still a little pricey. Then I found this board:<br /><img src="" alt="MDD3A" title="" /><br />
  192. This board is only $7. At that price I took two.<br />
  193. Now to drive this board is a snap. You only need 5 wires, Ground, M1A, M1B, M2A, M2B. That's it.<br />
  194. I went to work a coded up a driver for it in just a couple of minutes.</p>
  196. <pre spellcheck="false" tabindex="0">#include &lt;stdio.h&gt;
  197. #include &lt;stdlib.h&gt;
  198. #include "propeller.h"
  199. #include "smartpins.h"
  200. #include "mdd3a.h"
  202. int _M1A, _M1B, _M2A, _M2B;
  205. void mdd3a_Init(int m1a, int m1b, int m2a, int m2b)
  206. {
  207.    int f;
  209.    f = 500 | 500 &lt;&lt; 16;
  211.    _M1A = m1a;
  212.    _M1B = m1b;
  213.    _M2A = m2a;
  214.    _M2B = m2b;
  216.    _pinstart(_M1A, P_OE | P_PWM_TRIANGLE, f, 0);
  217.    _pinstart(_M1B, P_OE | P_PWM_TRIANGLE, f, 0);
  218.    _pinstart(_M2A, P_OE | P_PWM_TRIANGLE, f, 0);
  219.    _pinstart(_M2B, P_OE | P_PWM_TRIANGLE, f, 0);
  221. }
  223. void mdd3a_SetPWM(int pwm1, int pwm2)
  224. {
  225.    int set1, set2;
  227.    if (pwm1 &lt; 1000)
  228.        pwm1 = 1000;
  229.    if (pwm1 &gt; 2000)
  230.        pwm1 = 2000;
  231.    if (pwm2 &lt; 1000)
  232.        pwm2 = 1000;
  233.    if (pwm2 &gt; 2000)
  234.        pwm2 = 2000;
  236.    set1 = pwm1 - 1500;
  237.    set2 = pwm2 - 1500;
  239.    if (abs(set1) &lt; 5)
  240.        set1 = 0;
  241.    if (abs(set2) &lt; 5)
  242.        set2 = 0;
  244.    if (set1 &lt; 0)
  245.    {
  246.        _wypin(_M1A, 0);
  247.        _wypin(_M1B, -set1);
  248.    }
  249.    else
  250.    {
  251.        _wypin(_M1B, 0);
  252.        _wypin(_M1A, set1);
  253.    }
  255.    if (set2 &lt; 0)
  256.    {
  257.        _wypin(_M2A, 0);
  258.        _wypin(_M2B, -set2);
  259.    }
  260.    else
  261.    {
  262.        _wypin(_M2B, 0);
  263.        _wypin(_M2A, set2);
  264.    }
  266. }
  268. void mdd3a_Stop(void)
  269. {
  270.    _pinf(_M1A);
  271.    _pinf(_M1B);
  272.    _pinf(_M2A);
  273.    _pinf(_M2B);
  274. }
  275. </pre>
  277. <p>Smart pins made the job easier. The hard part was figuring out what all those codes mean to configure the smart pin and while I was at it, I made the driver compatible with an RC receiver.</p>
  279. <p>Now for the hard part. I decided to use an ICM20948 chip. This is the re-engineered MPU9250 from Invensense which is now a part of TDK. Same frustrating chip with a new twist.</p>
  281. <p>Anyway, I like a challenge and this chip aims to deliver. After working on it for about a week now I think I have the chip working enough to use in my project. The driver is massive with all the crazy stuff in the chip.  It has a DMP processor on it but to use it require a lot more memory and time that I don't need to look at. The documentation is poor, and the code is only available in binary format.</p>
  283. <p>For this project I only need the Gyro scope and the Accelerometer to work.</p>
  285. <p>Here is a picture of the complete robot ready to fall over.<br /><img src="" alt="Balance Bot" title="" /></p>
  287. <p>The most expensive piece is the P2. Now I need to build some loop code that can make this beast stand up on its own.</p>
  289. <p>Mike</p>
  290. ]]>
  291.        </description>
  292.    </item>
  293.    <item>
  294.        <title>Mobile Robot in Ukraine War</title>
  295.        <link></link>
  296.        <pubDate>Thu, 20 Apr 2023 00:48:24 +0000</pubDate>
  297.        <category>Robotics</category>
  298.        <dc:creator>erco</dc:creator>
  299.        <guid isPermaLink="false">175317@/discussions</guid>
  300.        <description><![CDATA[<p>More like an R/C car, but getting there. I have wondered why no ground-based robot tech has been used.</p>
  302. <p>Battle Bots for real!</p>
  304. <p><span data-youtube="youtube-99k2uL6_HI4?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span></p>
  305. ]]>
  306.        </description>
  307.    </item>
  308.    <item>
  309.        <title>Scribbler S3 - Can not set port COM9's options - DTR: false</title>
  310.        <link></link>
  311.        <pubDate>Thu, 20 Aug 2020 16:25:13 +0000</pubDate>
  312.        <category>Robotics</category>
  313.        <dc:creator>banjo</dc:creator>
  314.        <guid isPermaLink="false">172040@/discussions</guid>
  315.        <description><![CDATA[As written <a href="" rel="nofollow">in another topic</a>, my school purchased a couple S3's to try out, and they arrived today after only 3 days!<br />
  316. Unfortunately I do have two issues when trying to program them through BlocklyProp (Solo). Both issues seem to have something to do with failing communication between my computers and S3's.<br /><br /><b>Issue 1: Unable to upload programs</b><br />
  317. The first time I upload a program to S3, the upload is successful and the program runs.<br />
  318. But, after that the upload fails with below messages. Reinserting the USB-cable is sometimes helping, but it's a hit or miss.
  319. <pre spellcheck="false" tabindex="0">Compile... Succeeded.&#13;
  320. Download...Failed!&#13;
  321. &#13;
  322. -------- loader messages --------&#13;
  323. Scanning port COM9&#13;
  324. Can not set port COM9's options - DTR: false&#13;
  325. Error: Download failed!
  326. </pre>
  327. Added screenshot from BlocklyProp Launcher with verbose output<br /><br /><br /><b>Issue 2: Terminal screen empty</b><br />
  328. When the program sometimes uploads correctly, the terminal window is empty even if my program should output a text there. The only block I have is a "Terminal send text", see attachment. The C-code produced is below. Only once I've been able to see text in the terminal window.<br />
  329. Other blocks are working though.<br /><pre spellcheck="false" tabindex="0">// ------ Libraries and Definitions ------&#13;
  330. #include "simpletools.h"&#13;
  331. #include "s3.h"&#13;
  332. &#13;
  333. &#13;
  334. // ------ Main Program ------&#13;
  335. int main() {&#13;
  336.  s3_setup();pause(100);&#13;
  337.  simpleterm_reopen(31,30,0,9600);&#13;
  338.  print("Hello world, S3 calling...!");&#13;
  339. &#13;
  340. }
  341. </pre>
  342. <br />
  343. Same issues on two different computers and with both S3's, using Chrome (version 84.0.4147.135 (Official Build) (64-bit) on Win10.<br />]]>
  344.        </description>
  345.    </item>
  346.    <item>
  347.        <title>Walking/Flying Robot Spider</title>
  348.        <link></link>
  349.        <pubDate>Mon, 20 Feb 2023 18:56:02 +0000</pubDate>
  350.        <category>Robotics</category>
  351.        <dc:creator>erco</dc:creator>
  352.        <guid isPermaLink="false">175215@/discussions</guid>
  353.        <description><![CDATA[<p>From <a href="" rel="nofollow"></a></p>
  355. <p>Winning the Nobel prize for least power-efficient walking method and most jiggly flight...  I would call this a sofa-bed. Neither a good sofa nor a good bed. And quite a stretch of tech jargon for an acronym.</p>
  357. <p>But an A+ for effort and getting it to make it function.</p>
  359. <p><span data-youtube="youtube-lLvsxmJUyCk?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span></p>
  360. ]]>
  361.        </description>
  362.    </item>
  363.    <item>
  364.        <title>National Love Your Robot Day!</title>
  365.        <link></link>
  366.        <pubDate>Fri, 07 Feb 2020 03:54:18 +0000</pubDate>
  367.        <category>Robotics</category>
  368.        <dc:creator>Whit</dc:creator>
  369.        <guid isPermaLink="false">171172@/discussions</guid>
  370.        <description><![CDATA[<img src="/discussion/download/128652/robot.png" alt="robot.png" /><br /><br />
  371. February 7, each year, is National Love Your Robot Day! Hypable has a great article from 2013 - Our 10 Favorite Robots in Film and on TV. <a href="" rel="nofollow">Click here</a>. What do you think is missing?  How about this classic...<br /><br /><img src="/discussion/download/128653/Forbidden%20Planet.jpg" alt="Forbidden%20Planet.jpg" /><br /><br />
  372. In honor of National Love Your Robot Day, 2020, I have programmed my Parallax S3 Robot (in Spin, using Phil Pilgrim's excellent talk_v2 object) to say, "I Love Robots."<br /><br /><span data-youtube="youtube-tqMehIjPM5E?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span><br /><br />
  373. And just to be sure you know <b><i>what brand of Robots I prefer</i></b>, I have also programmed my S3 to say, "I Love Parallax Robots."<br /><br /><span data-youtube="youtube-P4UVNvCVPhA?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span><br /><br />
  374. Archived Spin Projects are attached.<br /><br />
  375. Thanks to my friends at Parallax, Inc., for all they do to make these fun projects possible - with the best hardware, coding methods, educational resources, and tech support around!<br />
  376. Thanks to all of you too, who have taught me so much.<br /><br />
  377. Have a great National Love Your Robot Day, and a great weekend!]]>
  378.        </description>
  379.    </item>
  380.    <item>
  381.        <title>hb-25 motor driver schematic</title>
  382.        <link></link>
  383.        <pubDate>Wed, 01 Feb 2023 00:36:45 +0000</pubDate>
  384.        <category>Robotics</category>
  385.        <dc:creator>jdolecki</dc:creator>
  386.        <guid isPermaLink="false">175185@/discussions</guid>
  387.        <description><![CDATA[<p>is there a schematic for this I have some that don't work?</p>
  389. <p>thanks, john</p>
  390. ]]>
  391.        </description>
  392.    </item>
  393.    <item>
  394.        <title>Elev-8 v3</title>
  395.        <link></link>
  396.        <pubDate>Sun, 13 Mar 2022 22:25:49 +0000</pubDate>
  397.        <category>Robotics</category>
  398.        <dc:creator>Luke1350</dc:creator>
  399.        <guid isPermaLink="false">174474@/discussions</guid>
  400.        <description><![CDATA[<p>Hi there, sorry if this is the wrong place, someone on reddit just suggested I ask around here for help.</p>
  402. <p>I recently was asked to help fix up 3 old Elev-8 v3 Quadcopters to teach a high school class about UAVs and aviation. However, they were assembled by a previous class a few years back (who only ever got two working) and then threw everything into a few large tubs. The working two were pretty straight forward to repair/setup and are working fine.</p>
  404. <p>However, the third drone has been a pain to fix. 50% because it was completely assembled wrong, and 50% they had somehow destroyed multiple components. They stripped the prop adaptor on one motor, and for some reason removed/broke the circle flip E ring on the bottom of another. Then they also cut on of the wires between the RX and flight computer, broke the aileron control on the TX, and destroyed the battery (It was swollen badly so I would rather be safe than sorry and not use it, I assumed they overcharged it/short circuited/charged it wrong).</p>
  406. <p>Battery, wise I have found and purchased a suitable replacement, and I know where to get a new standard controller and wires. But motors, and adaptors that match the rest of the drone seems to be more difficult to find since it has been discontinued. My hope was that someone on this forum had an old Elev-8 v3 drone that was either covered in dust, beyond repair, or had upgraded with some of the old parts lying around (knowing high school students this won't be the last repair these drones will need) that I could buy off of you.</p>
  408. <p>Or if these parts are still for sale could at least point me in the right direction.</p>
  410. <p>Thank you</p>
  411. ]]>
  412.        </description>
  413.    </item>
  414.    <item>
  415.        <title>Looking for Code for Gripper3 with Propeller1chip on Activity Bot 32500 (non ActivityBot 360)-</title>
  416.        <link></link>
  417.        <pubDate>Sat, 16 May 2020 14:02:16 +0000</pubDate>
  418.        <category>Robotics</category>
  419.        <dc:creator>aedford1551</dc:creator>
  420.        <guid isPermaLink="false">171592@/discussions</guid>
  421.        <description><![CDATA[Robot Articulation with gripper functionality combined -Will develop a program but there must be one already available. Found one for Basic bs  but not for propeller  ]]>
  422.        </description>
  423.    </item>
  424.    <item>
  425.        <title>HB-25 and robot arm. Axis drifting.</title>
  426.        <link></link>
  427.        <pubDate>Thu, 06 Oct 2022 16:06:54 +0000</pubDate>
  428.        <category>Robotics</category>
  429.        <dc:creator>jdolecki</dc:creator>
  430.        <guid isPermaLink="false">174896@/discussions</guid>
  431.        <description><![CDATA[<p>I have 6 HB-25 on my Scorbot robot arm.</p>
  433. <p>I'm using some simple Arduino joystick programming to control each driver with PWM.</p>
  435. <p>When the drivers have no power the arm axis's are difficult to move manually. The are all brushed dc motors with harmonic gearboxes.</p>
  437. <p>When the drivers are powered the axis's affected by gravity drift down. ( shoulder, elbow, wrist).</p>
  439. <p>The base rotate does not move as gravity has no effect on it.</p>
  441. <p>The joystick program on the Arduino works like its suppose to.</p>
  443. <p>Anybody have any ideas??</p>
  445. <p><img src="" alt="" title="" /><br /><img src="" alt="" title="" /></p>
  446. ]]>
  447.        </description>
  448.    </item>
  449.    <item>
  450.        <title>Where are instructions for ActivityBot 360° Robot Kit?</title>
  451.        <link></link>
  452.        <pubDate>Sat, 14 Jan 2023 20:37:07 +0000</pubDate>
  453.        <category>Robotics</category>
  454.        <dc:creator>JonTitus</dc:creator>
  455.        <guid isPermaLink="false">175136@/discussions</guid>
  456.        <description><![CDATA[<p>I bought two new Parallax 360-degree servos with built-in sensors.  I want a student to retrofit them to an ActivityBot that has an older Propeller Activity Board (32910, Rev A).  Neither of us can locate the construction information or info about how to connect the new servos.   I looked in the Downloads and Resources section for this 'bot and I looked in the Forums, but couldn't find a link to anything related to construction and setup.  Any help is greatly appreciated.  Thanks. --Jon</p>
  457. ]]>
  458.        </description>
  459.    </item>
  460.    <item>
  461.        <title>Animatronic Eyes</title>
  462.        <link></link>
  463.        <pubDate>Fri, 30 Dec 2022 12:45:51 +0000</pubDate>
  464.        <category>Robotics</category>
  465.        <dc:creator>Brian Fairchild</dc:creator>
  466.        <guid isPermaLink="false">175100@/discussions</guid>
  467.        <description><![CDATA[<p>A couple of years ago I was looking for animatronic eye assemblies for a playtime project, then Covid hit and the idea got shelved.</p>
  469. <p>I've now returned to the idea but cannot, for the life of me, find anyone selling the assemblies.</p>
  471. <p>I can find plenty of files to 3D print your own but I don't own, and can't justify, a decent 3D printer setup. And plenty at $$$$ prices, but nothing more reasonably priced. I'm looking to pay around $100 - $150.</p>
  473. <p>Does anyone have any leads?</p>
  474. ]]>
  475.        </description>
  476.    </item>
  477.    <item>
  478.        <title>P1 SCARA Project</title>
  479.        <link></link>
  480.        <pubDate>Sat, 21 Nov 2020 15:28:44 +0000</pubDate>
  481.        <category>Robotics</category>
  482.        <dc:creator>iseries</dc:creator>
  483.        <guid isPermaLink="false">172459@/discussions</guid>
  484.        <description><![CDATA[I have just started working on this SCARA robot and find it very interesting.<br /><br />
  485. I have all the stepper motors working and now I'm trying to figure out how many steps make a degree of movement.  This is all about the math or geometry.<br /><br />
  486. So the reach of the SCARA arm is about 200mm so the process is to determine how many steps equals 90 degrees for both the arm and the elbow.<br /><br />
  487. Once I have that I can use the law of cosines to position the arm any where on the grid.<br /><br />
  488. Mike<br /><br />]]>
  489.        </description>
  490.    </item>
  491.    <item>
  492.        <title>Killer Robot Application</title>
  493.        <link></link>
  494.        <pubDate>Mon, 28 Nov 2022 21:03:52 +0000</pubDate>
  495.        <category>Robotics</category>
  496.        <dc:creator>erco</dc:creator>
  497.        <guid isPermaLink="false">175032@/discussions</guid>
  498.        <description><![CDATA[<p>Literally... <a href="" rel="nofollow"></a></p>
  500. <p>According to the proposal, submitted in a document unanimously approved by the San Francisco's rules committee last week, the SFPD would employ robots allowed to use deadly force in situations where risk of loss of life to members of the public or officers is "imminent" and "outweighs any other force option available to SFPD."</p>
  502. <p><img src="" alt="" title="" /></p>
  503. ]]>
  504.        </description>
  505.    </item>
  506.    <item>
  507.        <title>Walking Excavators</title>
  508.        <link></link>
  509.        <pubDate>Sun, 27 Nov 2022 22:40:45 +0000</pubDate>
  510.        <category>Robotics</category>
  511.        <dc:creator>erco</dc:creator>
  512.        <guid isPermaLink="false">175029@/discussions</guid>
  513.        <description><![CDATA[<p>VERY COOL. But can they do a figure 8? <a href="" rel="nofollow"></a></p>
  515. <p><span data-youtube="youtube-0XSQY7KRmZk?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span></p>
  516. ]]>
  517.        </description>
  518.    </item>
  519.    <item>
  520.        <title>What's the important point for a 3d printer beginner</title>
  521.        <link></link>
  522.        <pubDate>Mon, 07 Nov 2022 11:35:11 +0000</pubDate>
  523.        <category>Robotics</category>
  524.        <dc:creator>Downdy</dc:creator>
  525.        <guid isPermaLink="false">174985@/discussions</guid>
  526.        <description><![CDATA[<p>As a beginner, when you prepare to get a new printer, what's the key point, speed? enclosed? core xy? Marlin or klipper?and screen? price?</p>
  527. ]]>
  528.        </description>
  529.    </item>
  530.    <item>
  531.        <title>Blue Atlas Robotics Autonomous Underwater Robot</title>
  532.        <link></link>
  533.        <pubDate>Mon, 24 Oct 2022 11:54:21 +0000</pubDate>
  534.        <category>Robotics</category>
  535.        <dc:creator>phillip12</dc:creator>
  536.        <guid isPermaLink="false">174936@/discussions</guid>
  537.        <description><![CDATA[<p>Just for your information &gt;&gt;<br />
  538. This underwater robot surveys marine assets like ships and offshore structures autonomously.</p>
  540. <p>It is driven by computer navigation and generates output as video and image and then creates a 3d model of the inspected assets.</p>
  542. <p>Here is the video &gt;&gt; <span data-youtube="youtube-M9Jj-1e1kko?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span></p>
  543. ]]>
  544.        </description>
  545.    </item>
  546.    <item>
  547.        <title>Cyber:bot ultrasound sensor 4-PIN</title>
  548.        <link></link>
  549.        <pubDate>Sun, 04 Sep 2022 16:25:27 +0000</pubDate>
  550.        <category>Robotics</category>
  551.        <dc:creator>dottest37</dc:creator>
  552.        <guid isPermaLink="false">174813@/discussions</guid>
  553.        <description><![CDATA[<p>Hi<br />
  554. I gave a Cyber:bot to my kid as a present and he is following the tutorials.<br />
  555. The recommended utrasonic sensor for the cyber:bot in the tutorials comes with 3 pins, sold by Parallax.<br />
  556. I have about 10 similar sensors, but they are the 4 pin version (generic, for Arduino, the ones sold on Amazon).<br />
  557. I know the ones from Parallax gives you the distance on one the same pin used for the trigger, and it is already calculated and free of noise, but I was wondering if I can use the 4-pin generic ones instead.</p>
  559. <p>The ping function from the cyber:bot library gets only one pin as parameter for input and output,, so I probably cannot use that.</p>
  561. <p>What options do I have here?</p>
  563. <p>Maybe using the ping function and connect the pin to the "trigg" pin on the sensor, and read the echo via a different pin on the cyber:bot?</p>
  565. <p>Using these generic sensors will open a lot of possibilities, since I have a few spare ones.</p>
  567. <p>Thanks a lot.</p>
  568. ]]>
  569.        </description>
  570.    </item>
  571.    <item>
  572.        <title>Robot in UK Parliament</title>
  573.        <link></link>
  574.        <pubDate>Wed, 12 Oct 2022 16:49:27 +0000</pubDate>
  575.        <category>Robotics</category>
  576.        <dc:creator>erco</dc:creator>
  577.        <guid isPermaLink="false">174909@/discussions</guid>
  578.        <description><![CDATA[<p>A canned AI presentation with all the usual hiccups. Still better than many US senator/congressmen!</p>
  580. <p><span data-youtube="youtube-Q4hoElmhemM?autoplay=1"><a rel="nofollow" href=""><img src="" width="640" height="385" border="0" alt="image" /></a></span></p>
  581. ]]>
  582.        </description>
  583.    </item>
  584.    <item>
  585.        <title>Older robot with swept object-avoidance sonar -- need software/code</title>
  586.        <link></link>
  587.        <pubDate>Sat, 08 Oct 2022 22:51:02 +0000</pubDate>
  588.        <category>Robotics</category>
  589.        <dc:creator>JonTitus</dc:creator>
  590.        <guid isPermaLink="false">174901@/discussions</guid>
  591.        <description><![CDATA[<p>I have an early Prop-1 "Activity" bot that has a third servo that sweeps an ultrasonic measurement unit back and forth.  If the robot encounters an object, it backs up, positions itself to avoid the object and moves forward.  I need the original demonstration software (SPIN) and documentation for this robot so I can demonstrate it to a class.</p>
  593. <p>The board is labeled, "Propeller Activity Board" with the number 32910 and "Rev A".  The continuous-rotation servos have add-on rotation sensors and attach to the board with three wires, red, black, and white.  I think this arrangement is obsolete.![]![] <br />
  594. I would greatly appreciate any help, having spent several hours searching without results. <br />
  595. Many thanks. --Jon<br />
  596. (<a href="" rel="nofollow"></a> "")</p>
  597. ]]>
  598.        </description>
  599.    </item>
  600.    <item>
  601.        <title>ELEV-8 V2 and Spektrum DXe</title>
  602.        <link></link>
  603.        <pubDate>Wed, 28 Sep 2022 12:16:58 +0000</pubDate>
  604.        <category>Robotics</category>
  605.        <dc:creator>kakaps</dc:creator>
  606.        <guid isPermaLink="false">174876@/discussions</guid>
  607.        <description><![CDATA[<p>Hello,</p>
  609. <p>I am a student working on building ELEV-8 V2 for a school project and reached step 37 of ESC Synchronisation and Range Check. (document at <a href="" rel="nofollow"></a></p>
  611. <p>I was trying to use the Spektrum DXe transmitter for this and ran motor direction tests with it already, but I couldn't get the motor running after connecting them through flight controllers with purple LED flashing on the flight controller.</p>
  613. <p>Is it possible to use Spektrum DXe for ELEV-8 V2? And If I can, then how should I fix this?</p>
  614. ]]>
  615.        </description>
  616.    </item>
  617.   </channel>
  618. </rss>

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