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solipso

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Everything posted by solipso

  1. Even Pete Scargill got bitten by this. See http://tech.scargill.net/i2c-the-easy-way/
  2. I do not use TI parts any more, but others who do so would maybe appreciate: - more eloquent errata, with code snippets. Each erratum should have at least one full page of clear and comprehensive description, dependencies and workarounds. - a poster for each micro: with pinout, basic characteristics, all peripherals, their registers, HAL library function names and parameters. It is extremely helpful to have a quick reference on one big A0 or A1 page.
  3. As an independent designer I stopped to use TI parts unless inevitable because of their sampling rules. They had gladly sent me whatever I needed for my development, then they stopped. Then I stopped to design using their parts and consequently my customers stopped to buy TI components for their production runs. It is that simple. I also teach microcontroller courses on a local Secondary school of EE. We used to use MSP430/Tiva launchpads as a teaching platforms. After the insane $21 shipping was introduced, the 16bit course was cancelled (It would had been anyway) and the ARM course migrated
  4. pine: It is strange; you got me pretty curious about the failure of your V1.4 launchpad. I would like to try to investigate what happened to your board if you agree to send it to me for an autopsy. You can contact me via my email it (a) boos.cz to negotiate details.
  5. Bought similar on eBay. Useless for me as it can not hold my heftier phone (185 grams) securely.
  6. The bug is still definitely in Energia 17 as the commit is later than the Energia 17's release date.
  7. You are right, the shipping is prohibitive for me. Nevertheless, thank you for the offer.
  8. Me too, 8oz please.
  9. Shipping to the Czech Republic is also $21. The difference between $7 to Germany and $21 to neighbouring CZ is insane. I can buy 7 pcs of STM32F103 devboards delivered from China for that $21, shipping included.
  10. This is the exact board we choose as our learning platform. It's a small world!
  11. Well, of course it had to be thought out, but as for the unreliability of sourcing - we ordered a boatload of MSP430 and TM4C launchpads from the TI e-store during years and invested into building courses around these boards . We had to re-think the term "reliability of sourcing" as soon as the prohibitive shipping of $21 came into account: Launchpads are made exclusively by TI. On the other side, STM32 boards are being made by many producers in China. As for the development/production costs, it is not the subject of these classes. For instance we use the free Keil MDK as our IDE. I doubt th
  12. It really seems nice, I just ordered one. Thank you for the tip.
  13. Yes, I am aware of those new Nucleo32 boards that ST launched this summer, but the course had to be prepared 6 months earlier. Nevertheless, the price of the Nucleo32 from distribution is more than twice as much as that of the ST-link + F103R8 board combo. Our intent was to encourage the attendees of this course to hack their own projects using up to date ARMs instead of some legacy platform, so competitive price was a high priority when selecting the exact learning set. M0 is fine for a lot of projects, but it is not as much ARM-ish as M3 . It would also take a bit more effort to adopt the c
  14. In fact, I ordered those boards, ST-Link clones, solderless breadboards, 5V/3V3 breadboard regulators and battery boxes from the Aliexpress, but I think those same can be bought on the eBay too. At first I considered using Nucleo boards too, but the compactness of breadboard friendly DIL form factor convinced me. Also replacing just the faulty target board gets a bit cheaper than buying a whole new Nucleo. Moreover I hope that my students will probably tend to use those cheap boards in their own hobby projects. The time will tell; the course just started and so far it goes quite well.
  15. I switched from TI's educational boards to STM's for my this semester's course because of the prohibitive shipping costs. Now my students are to buy a fully featured breadboard friendly M3 board for $5 and a ST-Link clone for another $3 shipped. I also discontinued the MSP430 course because there is no sensible reason to learn and use obsolete 16bit micros (not mentioning 8bits) any more. (Well, the FRAM is nice, but not a game changer at all.) The course-ware took me two weeks of work to migrate, but after all the STM32 is de-facto jelly bean industry standard, at least here in the CZ, so i
  16. solipso

    BMP180

    You will destroy your BMP180 sensor when loading it with more than about 1.3 bar - the membrane will break. The common road/trek bike tire has more than 4 bar when properly inflated. Some road racing cycle tires use even more than 9 bars. No need to tweak the code, your project will fail because of the sensor breakdown.
  17. I do not use Energia, but i doubt that digitalRead function is interrupt based. Just try to whack up a real ISR for both pins incrementing or decrementing your variable depending on previous state variables of respective pins.
  18. Hello, Forget relay, just whack an 1k resistor between the G of the Q4 and C of the Q2 and put a 10V zener across that 10k resistor and the Vgs of the Q4 is OK. Use a N-FET instead of the Q1 & D5 and you are ready to go. In fact, I would replace the Q4 with an N-FET too, just as a good practice. If MOSFETS cost half a penny each, why we still use BJTs? You can fly to the Jupiter just using the base currents of all those misused BJTs. Cheers, -=solipso=-
  19. solipso

    goodbye TI!

    I spent some good time with TI kits too, learned lots of things and liked the way they promoted their tech to the hacker scene. Of course those shipping prices now are a bit on the higher side and certainly will be a show-stopper for lots of hackers and students here. Nevertheless, there are other platforms, like the STM32, which are more affordable as kits and unlike Stellaris/Tiva, they are cheap and easy to source as parts, so it is possible to design a serious market product with them.
  20. Nice! But staring at the free space on the board, I would consider adding footprints for a couple of different M430s, for instance M430F2274 (which I like a lot) and M430G2955. That would make your nice design a lot more versatile. Regards, Tomas
  21. I bought lots of those and similar so far and not even one problem. Sometimes the item gets lost during shipment, but I received refund everytime.
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