Thanks for the feedback, I agree with most of it, see inline. On Tue, Dec 1, 2015 at 2:22 AM, <[email protected]> wrote:
> If I manage to desolve one of those components, is the IOIO board still > functional, when powered (5V) using 5V pin ? > For me, powering the IOIO and servos has been the biggest problem. > The main requirements are: > - IOIO could be powered using the standard 12V power adapter for "fixed" > projects > Yes, this is possible. Up to 15V is supported. Due to a bug you're already aware of the recommendation has been not to exceed 10V, but this bug is believed to have been fixed and the new units are shipping soon from SparkFun and SeeedStudio. > - in "mobile" projects, using either Lipo (7.4V) or LifePo(6.6V) battery > Yes, this is possible. > - it should be possible to SAFELY connect 3-4 servos to 5V connector in > IOIO and run these servos concurrently. May be a place for an appropriate > fuse should be added to limit the current and not damage the IOIO > The "3-4 servos" requirement is arbitrary. The next person is going to require 8 servos, and you see where it goes... The IOIO have a 3A regulator, which seemed to be a good trade-off between utility, cost and board space. Whatever load fits in this budget, great! Whatever doesn't, you can always use an external regulator. It is quite possible that you can use 4 standard size servos within 3A. This would depend on the actual servos, their gear ratio and the load. In either case, I agree that a current overload should not permanently damage the board. This is believed to be addressed by the new revision. One thing to ensure is that your motors do not badly surge the voltage as result of sudden changes in current. In case they do, proper protection is your responsibility (e.g. large capacitors and shottky diodes). > - another nice to have feature (even the physical size of IOIO board must > be increased): in P-pins where PWM is possible, there could be ground and > 5V pins, so that I can solve 3-pin male connector and connect the standard > servo 3-pin female connector. This would make it easier to connect servos. > People have done that with "shields" etc. I don't see as servos being special in any way and the trade-off would be increasing board size and cost, which might have the next person complain about why the board is bigger than necessary while they don't actually use it to drive servos. I tried to keep the IOIO focused on being generic, with the assumption that for application specific requirements, people can always implement shields / mother-boards or spin their own version of the board, while using the same software stack. > > When will the new hardware revision available? > I cannot speak for the manufacturers. They might be waiting to finish existing stocks before selling the new revision, etc. At least from my end, I have gone through sufficient testing of the new revision from both main manufacturers and am pleased with it. I know for certain that both are not going to manufacture more of the old boards, so it is only a question of when the next batch comes out. > Can you consider these modifications, Ytai ? > I believe the new revision would meet most of your requirements as-is, except for the servo-specific features, which I disagree with. Hope you understand my reasoning. > > > > > perjantai 13. marraskuuta 2015 22.36.54 UTC+2 Ytai kirjoitti: >> >> The switcher is the small square IC next to the power connector, which >> has no legs. The inductor is the large-ish cylindrical component next to it. >> A new hardware revision of the IOIO will roll out very soon, which >> addresses this issue. Until then, the advice is to not power the IOIO with >> more than 10V. >> >> On Fri, Nov 13, 2015 at 9:25 AM, <[email protected]> wrote: >> >>> I have exactly the same problem in 2 of my IOIO boards. If it is powered >>> using VIN->not working. If 5-5.5v supply is connected to 5v pin. The power >>> led will be on, but not working, and the processor gets hot. The resistance >>> between GND and 5V is nearly 0 (compared to functioning board 1-2 MOhm). >>> So what is the switcher to be eliminated to rescue the board ? The micro >>> switch near USB connector ? >>> >>> perjantai 13. marraskuuta 2015 9.28.17 UTC+2 Ytai kirjoitti: >>>> >>>> It does sound like a fried switcher, causing a low impedance path >>>> between 5V and ground. This is likely causing your 5V rail to sag, so it >>>> might explain why your Android won't connect. One way to hack around this >>>> problem is to desolder the switcher or the inductor. I would first verify >>>> this guess by measuring resistance between 5V and GND when not powered, and >>>> expect that you'll see a low value in the few ohm or less range. >>>> >>>> On Thu, Nov 12, 2015 at 2:57 PM, Zvonimir Udovičić <[email protected]> >>>> wrote: >>>> >>>>> >>>>> >>>>> Dana četvrtak, 12. studenoga 2015. u 17:50:08 UTC+1, korisnik Tyler >>>>> napisao je: >>>>>> >>>>>> Okay, can you give us more detail? When you power the IOIO, are any >>>>>> of the lights coming on? How are you powering the IOIO, specifically, >>>>>> where >>>>>> are you applying the 5v? Finally, does any part of the IOIO board feel >>>>>> very >>>>>> hot? >>>>>> >>>>>> >>>>>> power lamp lights normally, i am powering ioio with 5V adapter on 5V >>>>> pin, ioio board feels hot and vin pin is not working >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "ioio-users" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To post to this group, send email to [email protected]. >>>>> Visit this group at http://groups.google.com/group/ioio-users. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "ioio-users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/ioio-users. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
