Jump to content

abc

Members
  • Content Count

    93
  • Joined

  • Last visited

  1. abc

    Embedded for a 10 year old?

    Bought this: http://www.ebay.com/itm/181409484752?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT 10pcs 6mm 2 phase 4 wire micro-stepping motor Canon with a small plastic gear for $2.58 Figured, at this price, we might use them for something. What are they good for? Could one make a robot (a tiny "creature") out of these, with a little Polymorph or 3D printing? It does not specify the torque, I expect it to be tiny. BTW, I've read more about Polymorph and am in love with it. I'd buy servos if I saw them at this price. Still looking. Suggestions would be greatly appreciated.
  2. abc

    Embedded for a 10 year old?

    I mean, generates more voltage spikes? I've heard that a 5V servo can create a 100V spike, is that true? I understand that's why servos require a couple of diods and maybe a capacitor, to get rid of the spike? I meant $1/oz for Polymorph, not $1/lb of course. I've also read somewhere that one can use hot glue for the same purpose, has anyone tried that?
  3. abc

    Embedded for a 10 year old?

    Someone had told me that servos are more sparky than steppers and thus require more circuitry, is that true? I don't mind it over the long run, but it's nice to start with something simple. Someone had recommended me Polymorph plastic (very strong and durable plastic that becomes soft and pliable at 60 c). I am fascinated with this stuff, but it's $1/lb, and that probably means smaller robots. (Though I've also read that a cheaper alternative is glue from some hot glue sticks - but I wonder if they are as safe, etc.) Is there a place on this forum or elsewhere for discussing the mechanics of robotics?
  4. abc

    A buffer?

    I've been reading up on using some sort of a $.50 hex buffer in order to shield the board from power fluctuations, short circuits and other newbie mistakes. Seems like a great idea! In fact, I wonder why it's not routinely done, at the entry level at least; but I must be missing something. What are the disadvantages to using this approach? And what buffer, if anything, would you guys recommend? (Same application, for the use by a 10 year old, to work with some motors, LEDs and what not). Putting things more generally, what other measures can be taken to protect from newbie mistakes? My first thought was a fuse, but I was told a fuse takes time to burn and is therefore unreliable. How about, putting peripherals on separate circuits, controlled by transistors, so that only transistors connect to the board? That can be done with outputs; what about with inputs? Ideally, I would like some sort of protection that does not silently swallow circuitry mistakes, but provides feedback (by visibly burning, if it must), for educational value.
  5. abc

    Embedded for a 10 year old?

    Thank you all so much for the wealth of info! Do we need an anti-static wrist band? I am thinking probably not, with hardwood floors and humid climate. Am I right?
  6. abc

    Embedded for a 10 year old?

    This is getting more and more OT, but.. what do people think of electric ink and electric glue? Seems like a good idea, but its popularity seems pretty low, why?
  7. abc

    Embedded for a 10 year old?

    The steppers I linked to are $12 for a 5-pack. As for simplicity, I am a bit confused, because I've just read this:
  8. abc

    Embedded for a 10 year old?

    Thank you. I've canceled my order and went with the one you recommended. Since you all are so nice... this motor: http://www.ebay.com/...=item3394d5ad89 - is there some sort of a standard part that can be put on the axis? How do I attach things to the axis?
  9. abc

    Embedded for a 10 year old?

    Thank you for the feeback, abecedarian. I wonder what the price difference might be, from the top of your head (if I was to buy those things separately), and whether the book makes up for it. I won't have much free time, so a good simple book might be a life saver. Then again, the O'Reilly book can be rented for $6 on Kindle: http://www.amazon.com/Make-Embedded-Projects-Hardware-Discovery-ebook/dp/B00DBIEYIC/ref=tmm_kin_rent_0?_encoding=UTF8&selectObb=rent&sr=8-1&qid=1411173810
  10. abc

    Embedded for a 10 year old?

    I am afraid we'll have to start with Arduino after all, simply because all starter kits that I could find come with an Arduino board anyway.. unless someone knows of a kit that does not? This may be OT (or not, since all these peripherals and documentation can be reused with Energia, right?), but I'd really appreciate an advice of which kit to buy. I've narrowed down my search to two kits. http://www.amazon.com/16Hertz-UNO-Ultimate-Starter-Breadboard/dp/B00KGF0ZD6/ref=lh_ni_t?ie=UTF8&psc=1&smid=A3B2Y7HLMJUU6V and http://www.amazon.com/Arduino-Ultimate-Starter-Includes-Instruction/dp/B00BT0NDB8/ref=pd_sim_e_5?ie=UTF8&refRID=0QF2WX90ZADRBE1E9AFV The first one has more parts, the second one comes with a 72-page instruction book and comes fast. Unless the missing parts are very expensive on their own, I want to go with something simple, something my son could learn independently. Or.. any better choices? (Remember, we are building a creature). If I can stick with Energia without overcomplicating things, I will. Perhaps TI would be better off making hardware kits and manuals for them to go with Energia, with a separate brand name, just like Arduino does.
  11. abc

    Embedded for a 10 year old?

    will a self-powered USB hub help? Or even bus-powered, for that matter. Short-circuit happens.
  12. abc

    Embedded for a 10 year old?

    One more question: how do I protect my computer's USB port from power surges and such? I've burned one port already!
  13. abc

    Embedded for a 10 year old?

    Might have found a solution. We went to the thrift shop and boght 1) a Barbie doll (her knees and elbows only bend in one direction ==> may move them with just one stepper motor per extemity? They would hopefully bend on their way forward and stay firm on the way back, thus propelling the robot. Especially is I add some teflon to the toes and rubber to the heals? 2) A $5 Furby. How hard is it to hack a Furby and take away its eyes, legs, beak, etc and put them into the robot? Edit: found plenty of materials on hacking a Furby: http://www.instructables.com/id/Hack-Your-Furby-into-Zombie-Furby/ We are building a creature - that's the only limitation, other than the budget. Edit: we also saw a gooseneck lamp - can it be turned into a real neck, perhaps movable by solenoids?
  14. abc

    Embedded for a 10 year old?

    Is this a good purchase? http://www.ebay.com/itm/5-Pcs-DC-5V-Stepper-Step-Motor-Driver-Test-Module-Board-ULN2003-For-Arduino-/221540363657?pt=LH_DefaultDomain_0&hash=item3394d5ad89 I don't understand why a stepper motor requires a separate "shield" or some other sort of a board. I was hoping a stepper motor just takes raw input? What input does it take, and what does the board do? Could have researched myself, but am under a major time crunch, have to come up with some sort of an idea by tonight.
  15. abc

    Embedded for a 10 year old?

    Raspberry PI sounds like a great option, but got to stick to the budget. And the budget is tiny. On the last Mini Maker fair, I saw a Raspberry PI-looking computer that they said was purchased in Oregon for $10, case included. Any idea what that was? Also, I've heard there was some sort of a giveaway very recently, or something that was described as "Raspberry PI on steroids"? Is that still around? Thank you everyone and I hope this thread is not too OT!
×