Jump to content
43oh

rockets4kids

Members
  • Content Count

    491
  • Joined

  • Last visited

  • Days Won

    11

Everything posted by rockets4kids

  1. Aah, those are much smaller SLAs than I am familiar with. Do you know the type specification?
  2. SLA batteries to power your rats? Those are going to be some darn big rats!
  3. The MSP430 doesn't really have any heritage from the TMS9900. Also worth noting that what killed the TI 99/4A more than anything else was TI's refusal to release any technical details on the machine. While they did relent in the end, the machine was pretty much dead by that point. This is largely why you see far less retro interest in the 99/4A than just about any other machine of the era.
  4. Yup. That's the one. I had the PDF saved but not the source location.
  5. Sampling fraud has been a *huge* issue in recent years for every vendor that provides samples. All of them have been gradually tightening up on their sample policy for at least 2-3 years now.
  6. Go searching for this document: issc11paper_FINAL.pdf
  7. While the programmer can run from RAM you do not need to do it that way and should not do it that way in this case. The easy solution here is to use a custom bootloader that loads code updates from an SD chip instead of serial. I am not aware that such a bootloader exists for the MSP430, but it would not be difficult to write one. Doing so is *far* simpler than any of the other options so far presented.
  8. All of the MSP430 parts are fully self-programmable. All you need to is read blocks from the SD card and write them into the MSP430's flash memory.
  9. The UART on all MSP430s is capable of speeds well beyond MIDI. You (as well as several other responders here) are misunderstanding the raw output of the UART with it's connection to the LaunchPad dev board.
  10. I wasn't referring to C14, I was referring to C20 and C23. C14 absolutely must not be more that 1 nF. IIRC you can generally get away without C14.
  11. The target chip *must* share a ground with the tool you are flashing it with. Unrelated, but you need proper decoupling caps in addition to the pullup on reset if you want anything to work.
  12. *Any* motor or solenoid can generate inductive spikes if it doesn't have a proper snubber network. An R/C servo should have one internally. Hobby King is a good source for inexpensive servos: http://www.hobbyking.com/hobbyking/store/__287__189__Servos_Parts-Micro_Servo_5_10g.html Be sure to order from one of the US warehouses. Many people have had bad experiences ordering from the International warehouse.
  13. My bad. I provided the wrong link. There was a time when you could feed IPA into AT&T's tool, but it now appears that functionality is no longer available.
  14. My understanding is that the whole point of IPA is to eliminate those issues.
  15. That still doesn't seem quite right when spoken by AT&Ts tool: http://www2.research.att.com/~ttsweb/tts/demo.php
  16. It should be a hard G, but three syllables with the accent on the second.
  17. What do you mean by "more sparky?" IMO, if you want to keep things as simple and as cheap as possible, you want to be using R/C servos. I don't know if there is a servo library in Energia, but oPossum5150 has posted code here that will let you drive 8 servos from even the most basic of MSP430 parts. I have never used polymorph, but I have heard good things about it. $1/lb actually sounds absurdly cheap to me -- are you sure that is the correct price?
  18. My understanding is that the name came from the Russian space program, in which case proper pronunciation can be heard in this youtube clip:
  19. You seem to have missed the entire point of this this thread: making embedded/electronics accessible to 10 year olds. OP mentioned conductive paint/glue because it is commonly touted as being an enabling technology for youngsters in electronics. While the concept certainly shows promise for the future what is available today is not viable. Furthermore, the people promoting it exemplify my biggest peeve in the "maker movement" -- selling an expensive item at a ridiculous markup under the guise of helping introduce people to the hobby that is almost certain to make them unhappy and frus
  20. There are, of course, multiple definitions of "free", but there is absolutely no doubt that the Circuit Maker is less free than Eagle.
  21. Joe writes: > The OP asked about use of conductive paint/epoxy, I did not indicate that conductive thread was a viable solution, I indicated I would use conductive before I would use conductive paint. Maybe you would, but I sure wouldn't. It has all the disadvantages of conductive paint (expensive, high resistance) and yet at the same time is more difficult to use thanstandard copper wire. > But doing a bit more research, The Adafruit web site indicates that a 3 ply stranded stainless steel thread has the following specs: > > Measures 0.25mm thick, 3 ply threa
  22. On a few topics... Conductive thread usually has appreciative resistance -- on the order of 10-30 ohms per foot -- and doesn't address the connectivity issue. In fact, connecting it can be a real PITA. It is fine for LEDs where you can factor in the resistance instead of using a dropping resistor, but otherwise I don't see much use for it. Just because your MOS part hasn't failed outright doesn't mean you haven't damaged it or altered its characteristics. Every time you discharge through the gate you are punching a tiny hole in it. A few tiny holes will not make much of a differenc
  23. Ditto on enl's comments. There is a reason the only people touting it are the people selling it.
  24. That is actually a very good deal for the stepper+driver setup. The only thing to be aware of is that you have no absolute position setting (or maintenance) with the steppers. Driving a stepper with a uln2003 is actually quite a bit more complicated than driving a servo. Driving steppers is only easier when you have an intelligent controller, which the uln2003 is not. However, with the appropriate software driver library, all of those complexities are abstracted away. The availability of that driver library is, to a large part, going to determine where you can use them. Unless, of co
×
×
  • Create New...