Re: [Gumstix-users] Overo and robotics

[blunce <bru...@co...>]

It would be nice to simply have an MCU-less breakout board with "regular"
voltage levels on headers (3.3V or 5V) for those (like me) who already have
an auxiliary processor. As long as I have access to digital serial comms to
my board, I'm not sure I would need the OMAP GPIO. I'll use the Overo as the
application proc. The 3.3V or 5V choice is tough! How about a jumper select?
I mostly see 5V devices. If the omap is 5V tolerant (doubtful) then go with
3.3V.

It would be pretty cool to include a nice DC-DC converter on the expansion
board to feed the usual external circuitry, sensors etc (5V,3.3V at a couple
amps ). Wide voltage input (4-17 like you said is great). A lot of us use
the 7.2V RC batteries.  



Gordon Kruberg wrote:
> 
> 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.
> 
> W. Gordon Kruberg, M.D.
> President and C.E.O.,
> Gumstix, Inc.
> 
> 
> 
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