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Erco's Figure Eight Challenge - Page 13 — Parallax Forums

Erco's Figure Eight Challenge



  • ercoerco Posts: 20,248
    It's very a free form "challenge". :)

    The original intent was to demonstrate dead-reckoning accuracy by doing a programmed (autonomous) 360 left circle and a 360 right circle (or vice versa). But in truth, it's always harder than it sounds, and we always like to see new robots, so we mostly dispensed with the rules.

    Creative interpretation/cheating is king, though. Some of my favorites that spring to mind:

    1) Ttailspin's bot was struggling, so he duct-taped (?) it to the top of a Parallax S2 robot that carried it around a picture-perfect, wheel-encoder-accuracy figure 8.
    2) Martin_H did the "Oval Challenge" (different thread, same spirit). He made an oval cardboard wall, which his wall-following robot faithfully orbited. Pure genius.
    3) Martin_H also made his robot arm draw a Figure 8. Probably in Forth...

    Duane Degn has a lot of neat bots, hexapods & mecanum wheels using IK and a great deal of razzle-dazzle.

    All these guys expose me for the true hillbilly hack that I am!
  • Hope to get something together in the next week, naturally I have reached my data limit this month. Can a small video be posted here, or does it have to go through utube? What format is best?
  • @Erco, I'm glad two of my cheats made your list.

    @MikeDYur, any video service is acceptable. Some people use YouTube, others Vimeo, use whatever works.
  • Thank,s Martin
  • ercoerco Posts: 20,248
    I think the RC guys want in on F8C!

  • TtailspinTtailspin Posts: 1,326
    edited 2015-10-27 13:18
    That is too cool, but if we let the RC guys in, where will that lead?, I mean, will these guys want in too?...
    It's all good, After all, a figure 8 is a figure 8.

  • ercoerco Posts: 20,248
    Rubbin' is robotin'!
  • This is a microcontroller forum.
  • ercoerco Posts: 20,248
    MikeDYur wrote: »
    This is a microcontroller forum.

    And "Robotics", of course. But let's face it, a lot of what people call "robots" are just radio controlled, like bomb disposal robots, pyramid exploring camera robots, and of course drones. The lines are permanently blurred, and that toothpaste is not going back in the tube.

  • A true robot would be able to make it home, if it lost radio control.
  • ercoerco Posts: 20,248
    Agreed, just like Wall-E did.
  • I can't recall, did Wall-E ever do a figure eight on screen?
    Somebody will have to sit down, watch the movie again, and report back...

  • That robot brought a tear to my eye, and in the first part of the movie, I don't get that emotional over a human actor.
  • Ok, using the strictest interpretation of the rules of this challenge,
    Wall-E and EVE do indeed complete a figure 8... Good to know... gonna store that away with all the other important things i know.

  • Ok here's my simple attempt. Not sure how to get a still pic of the video with play button.
  • The video is marked private. You need to make it public so we can see it.
  • Ok hope that did it.
  • ercoerco Posts: 20,248
    Beautiful job and robot, Mike! 4WD, right? Love those steered and driven front wheels! That bot has tons of potential. Keep it up!
  • Sweet looking robot that turns surprisingly tight.

    Is it front or rear wheel drive?
  • Thanks guy's, it's four wheel servo drive, wanting to upgrade to high torque ball bearing servos. Will give me more speed to.
  • For some reason this smartphone wouldn't let me paste this in the last post.
  • ercoerco Posts: 20,248
    edited 2015-10-29 22:07
    Maybe Red Bull will want to sponsor the F8C! We should add blacklights, lasers and rock & roll to our videos.

  • I agree with Erco, that independent suspension looks like it has lots of potential. Slap a GPS on that baby and send it cross country.
  • ercoerco Posts: 20,248
    Bitchin', did you build that yourself?

    RoboMagellan is calling, Mike!
  • Mike here;
    Yes I did, no budget for nothing fancy, but I had aluminum!
  • This has been my phones background since I found it.
    720 x 1280 - 1019K
  • Mars Spirit and Opportunity got me interested in doing something like this, but it was the successful landing of the Mars Curiosity Rover MSL that got me started in earnest. The original design was to have two Propeller's, but it started out with a BS2 controlling a P.S.C.U..
    Most all of the sensors and other boards are already included in the robots firmware, but are in the process of being socketed to proto boards.
    Aa drill press and hand tools we're all I used, to get to the fun I'm having now with it.
    Below is a list of my pin assignment's, some of which can be changed like stereo, P.S.C.U.rx, GPSrx.

    Propeller Robot QuickStart Header Pin Function Description.

    Pin 00 SD_Dout, SD Memory card, Sensirion SHT-11 (SDA)
    Pin 01 SD_Clk, SD Memory card, Sensirion SHT-11 (SCL)
    Pin 02 SD_Din, SD Memory card
    Pin 03 SD_CS, SD Memory card Pin 04 1 XBee Rx, XBee DOUT Pin 05 1 XBee Tx, XBee DIN Pin 06 1 GPS Tx
    Pin 07 1 GPS Rx
    Pin 08 3 WS2812 RGB LED
    Pin 09 3 TLS230 Light to Frequency
    Pin 10 3 Audio out, right channel
    Pin 11 3 Audio out, left channel
    Pin 12 2 #29124 Altimeter-Barometer, SDA Pin 13 2 #29124 Altimeter-Barometer, SCL
    Pin 14 1 P.S.C.U., TX
    Pin 15 1 P.S.C.U., RX
    Pin 16 2 PING))) Sensor, Forward
    Pin 17 2 PING))) Sensor, Aftward
    Pin 18 2 PIR Sensor, Port
    Pin 19 2 PIR Sensor, Starboard
    Pin 20 1 MX2125 Accelerometer, X
    Pin 21 1 MX2125 Accelerometer, Y
    Pin 22 2 Piezo Speaker
    Pin 23 3 Lighting or Utility
    Pin 24 3 Lighting or Utility
    Pin 25 2 LCD Debug, Diagnostic
    Pin 26 3 Emic 2 Text-to-Speech Module, SIN
    Pin 27 3 Emic 2 Text-to-Speech Module, SOUT
    Pin 28 SDA Propeller EEPROM I2C Data
    Pin 29 USB_PWR_ENn FTDI Enable USB Power, Active Low,
    Pin 30 SCL Propeller EEPROM I2C Clk
    Pin 31 XI Crystal Input
    Pin 32 TX Propeller TX
    Pin 33 RTSn FTDI RTS Flow Control, Active Low
    Pin 34 RX Propeller RX
    Pin 35 CTSn FTDI CTS Flow Control, Active Low
    Pin 36 Resn Propeller Reset, Active Low
    Pin 37 +3.3 V (Vdd) 3.3 volt power rail, 1 amp max
    Pin 38 GND (Vss) Ground reference
    Pin 39 Vin Unregulated Voltage Input to QuickStart board
    640 x 480 - 168K
  • Some other pics,
    912 x 684 - 124K
    912 x 684 - 128K
    912 x 684 - 89K
  • MikeDYur wrote: »
    Some other pics,

    Nice! I look forward to hearing more about this project.
  • It puts the design of my current 4x4 to shame. Sorry, but I will have to copy some of your ideas.
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