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Line Dance --- Maker Style

It's time for another robotics Make meetup! In March we will be assembling simple bots using geared stepper motors, a framework platform, a light sensor, printed wheels, an Arduino, a motor shield, and a battery pack.

The workshop will focus on assembly of the electronics to the platform, and the motors, wheels and sensor. We will then program the bots to follow a line taped on the floor.

We are putting together 15 kits. Kit cost is only $25 and includes platform, sensor, 2 motors, 2 wheels, and battery box. (Note: you must supply your own Arduino and Motor Shield) Please RSVP to claim one of the kits. First come first served. (Earlier RSVPs get priority, must be present to win)

We suggest that you bring your Arduino and motor shield all soldered up (if kits) and ready to go. If you solder quickly, there will be time to solder one or the other and still build your bot.

If you don't have a motor shield yet, you can buy one already soldered for $25 locally: http://shop.vetcosurplus.com/catalog/product_info.php?cPath=640&products_id=12794&osCsid=mb2pnoi7hsmhb68190ijcijln3. You can also order a kit on-line here: http://207.58.139.247/products/81.

Items you will need for bot building:

1. #2 Phillips screwdriver.

2. #0 Phillips screwdriver.

3. Solder iron.

4. Wire cutters and strippers.

5. Needle-nose pliers.

6. Laptop with Arduino http://arduino.cc/en/Main/Software installed.

7. Programming (USB) cable appropriate to your particular flavor of Arduino.

 

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  • Mark (.

    Had a lot of fun and, as always, learned a lot. Would love to see a second part to this where we connect the sensor and get the bots dancing!

    March 10, 2013

  • Cindy B.

    I also really enjoyed the meetup, and meeting many of the attendees. I ordered more components and the O'Reilly Arduino Cookbook last night. :-)

    I also like the idea of a PCB meetup!

    Thanks Dan for organizing!
    -Cindy

    March 10, 2013

  • Warren D.

    I posted this in the opposite order it was to be read because of the character limit.

    I really enjoyed this meetup, and I hope this information helps you in planning the next. I am committed to the MAKER movement and I will help out in any way I can.

    Warren Davis

    March 9, 2013

  • Warren D.

    Here's the idea:
    1) 3x5" single sided boards, I think about $5 each.
    2) Circuit development software (I think you mentioned Eagle, free).
    3) Sheet of Press-N-Peel Blue. I have 20 sheets that I will donate.
    4) Laser printer or photocopier.
    5) A laminator (one of the Vetco sales staff has one, just ask nicely...) or an old iron.
    6) Big bottle of ferric chloride, about $15.
    7) A small tray, in which to etch the boards.
    8) Some way to collect all the toxic waste. OK, i don't think it's THAT toxic, but you shouldn't just go flushing it down the drain.
    9) Chemically tin the traces? Vetco hs a tinning solution as well.

    I'm off on a different tangent. Trying to take my homemade PCBs to the next level, using an Epson Artisan 50 printer and this: http://www.fullspectrumengineering.com/pcbinkjet.html, and later maybe this: http://techref.massmind.org/techref/pcb/etch/Artisan50.htm.

    March 9, 2013

  • Warren D.

    Dan,

    As to our next meetup, fabricating circuit boards, I have an idea. I don't have a circuit in mind, but for the fabrication process, I do.

    If you host it with Vetco, they have both copper clad boards and etchant. Just chatting with the folks working and shopping there today brought up some interesting possibilities, yet I remain convinced that the best route for beginners is Press n Peel Blue, available here: http://www.techniks.com/.

    Although I haven't tried it, I understand that best results are achieved using a laminator. I've always used an old iron, and the results are decent, after some number of tries.

    Here's how it works: Print a mirror image of your circuit on a laser printer onto PnP blue, or photocopy it. The important part is the toner (which is why it's called toner transfer). Transfer the toner+stabilizer (which is embedded into the PnP sheet) to the bare copper. Etch it. (Continued..)

    March 9, 2013

  • AlexC

    Fun meet up, thanks, couldent put it down when I got home. I did get it going around in a semi square circle. As far as I can tell these steppers are fairly weak, and the battery pack we are dragging is causing a friction problem because the wheels are so slick. I put rubber bands around my wheels. With that and using the "DOUBLE" step type I got it moving on a smooth surface (core board). however it still can’t reliably do an in position turn (too much friction on the battery pack to move it sideways) so I'll move the battery pack to a position in-between the Adriano and the bot frame and add a small caster wheel on the back. That should put more weight down on the wheels 4 friction, and remove the battery pack drag effect. I also split the power out, (9v powering the arduino (between motors), battery pack powering motors. Note: Adafruit says this motor can do upwards of 80 RPM at 9v but im not getting even remotely near ½ that at ~6v so quite possibly still doing something wrong.

    March 9, 2013

    • Warren D.

      I think geared, PWM controlled DC motors would work better, and if the battery pack was relocated under the chassis, it would place the CG close to the che contact point of the wheels to give maximum traction. The small imbalance could be shifted forward, and that tiny load absorbed by some sort of teflon skid plate, like a table leg glide from a hardware store. Place one forwarrd, perhaps in conjunction with the sensor; and one aft, useful for sudden accelerations.

      March 9, 2013

  • Dan T.

    March 9, 2013

  • Asher M.

    Bummer! Family obligations take me to PDX this weekend. Hope to make it next time!

    March 8, 2013

  • Mark K.

    What do we need to bring for batteries? 2 AA batteries per robot?

    March 8, 2013

  • Warren D.

    I'm a little late to the game, so I expect there will not me enough kits to go around, but I'd love to help out, or just watch!

    March 7, 2013

  • Cindy B.

    Hello. If there are any kits available as of of 3/3, I would like to join the festivities. I'm starting from scratch, so will try to acquire all of the equipment before the meetup. Any recommendations on the best Arduino model, motor shield to purchase?

    Thanks! --Cindy

    March 3, 2013

  • AlexC

    Yes to a kit, happy to pre-pay,.

    March 3, 2013

    • Asher M.

      Me, too. I've got the Arduino and the motor shield; just need the rest.

      March 3, 2013

  • Dan T.

    Maker Alex asked the following question:

    --------------
    Hi, I signed up for the "Line Dance --- Maker Style" a week or two ago,. Count was just 15 with me,. But I see now there are 18 coming and only 15 kits,. So I just wanted to make sure that if I show up ill have a kit. I saw now its first come first serve,. Is that in order of show up on day, or order of sign up on the group?
    --------------

    Our rules for dividing up the kits run as follows:

    1st priority - RSVP and say yes to a kit, then prepay. OK, I know, not fair as I didn't offer a way to prepay this time. Message me if you would like to do so.
    2nd priority - RSVP and say yes to a kit, then show up with cash.
    3rd priority - Show up with cash, and any un-purchased kits are up for grabs.

    So far (as of Sat the 2nd), there are still 4 kits available, so all of you who requested one (or two) are sitting good with reservations.

    -Dan

    March 2, 2013

  • A former member
    A former member

    I would love to call dibs on a kit if there are any left :-)

    February 17, 2013

  • Dan T.

    Jeff, Motor Shields are available both locally and on-line. I have added links in the meetup announcement.

    February 12, 2013

  • Mark K.

    Sound fun!

    February 12, 2013

  • Jeff N.

    What is the Motor Shield, I dont think I have one

    February 12, 2013

  • Jeff N.

    See you there

    February 12, 2013

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