From: Sergey L. <luk...@gm...> - 2009-10-08 14:08:13
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Hi Gordon, Are you still working on the Overo-compatible robot expansion board? It has been almost a year since you posted this message. Is the project abandoned? It would be nice to see such board. Kind regards, Sergey As we work on the design for an Overo-compatible robot expansion > board, it would be very helpful to know more detail. > > As we currently contemplate the board, currently unnamed, it does not > have an additional processor on it (but we could do so). > We suspect that we need all of the PWM, A/D, UART, SPI, GPIO, in > addition to the audio lines and USB-OTG of the Summit board. > > The biggest question is about power levels. We suspect that 1.8V > logic on the PWM is not adequate and are looking at 5V. > A/D would be standard TPS65950 input for ADC2-7 (2.5V) > SPI,UART,I2C make sense at 3.3V... > > Question for all PWM users-- would 3.3V be OK? Or would 5V logic be > better? Or keep them different? > > What about V_in range of (approximately) 4V - 17V? > > Thanks for any and all feedback. > > Gordon > > > > > > Hi, > > > > I am currently using Gumstix Connex and Robostix in my robots, and I > > am very interested in using the new Overo motherboard, because it > > provides more power, floating point capabilities A/D inputs and PWM > > outputs. > > > > The summit expansion board can be used in a robot, but it is not very > > well suited to the task. It is like using a breakout board for a > > Gumstix. One has to use additional circuits, on other cards, to > > satisfy basic needs, like driving a servo, or reading an analog > > sensor. The Robostix expansion is there for that, and an equivalent > > for the Overo would be welcomed. > > > > I understand that expansion boards are being developed and are not yet > > announced, so an expansion board designed for hobby robotics might be > > on Gumstix's roadmap, in which case this mail can be ignored. But if > > it isn't, then I hope that this mail may help Gumstix consider such a > > board. > > > > What I would like changed compared to the Robostix: > > > > - the ability to stack it on top of a custom board is currently > > limited by the layout of the Robostix's I/O and power pins. Those pins > > are almost regularly 0.1" spaced, so that an headerless Robostix can > > almost be plugged on a breadboard or prototype board. The "almost" is > > what I would like changed. Between the GPIO banks and the A/D banks, > > there is a space that is not a multiple of 0.1". Similar things can be > > seen on the other side. It would be nice to have a board with 3-ranked > > 0.1" spaced headers on one side (for GPIO, A/D, PWM...), and 2-ranked, > > 0.1" spaced headers on the other side (for Serial, power, ISP...). An > > headerless version of the board (with headers soldered towards the > > bottom of the board) could then easily be stacked on top of a > > breadboard, and custom boards could easily be designed to expand the > > capabilities of such a board (add H-bridges for motors, power > > regulators for 12V to 5V conversion, etc...). > > > > - the ATmega128 on the Robostix is powerful, but maybe it could be > > replaced by an XMEGA. They provides high speed UART, more A/D lines > > and PWM lines and can run at 32 MHz. > > > > - the I2C link between the Gumstix and the Robostix is sometimes a > > little too slow. It would be nice if it could run to 1MHz, or maybe > > replaced by an high-speed UART or SPI (it depends and the OMAP > > capabilities on this matter obviously, and I don't know them very > > well). > > > > > > I wrote this mail because I think that expressing one's needs is one > > good way to help Gumstix know what we need. > > > > I am looking forward to seeing Gumstix's future products: thank you > > guys, they are very often awesome. > > > > Thanks for reading. > > > > -- > > > > Thierry Genovese > > > > ------------------------------------------------------------------------- > > This SF.Net email is sponsored by the Moblin Your Move Developer's > > challenge > > Build the coolest Linux based applications with Moblin SDK & win > > great prizes > > Grand prize is a trip for two to an Open Source event anywhere in > > the world > > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > > _______________________________________________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > W. Gordon Kruberg, M.D. > President and C.E.O., > Gumstix, Inc. > > > > > -- > View this message in context: > http://www.nabble.com/Overo-and-robotics-tp20636287p25802988.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > > |