zero ohm SMD resistors are available for this very purpose and often used. On Fri, Oct 4, 2013 at 11:12 AM, garyamort <[email protected]> wrote: > I've mulling about an really off the wall idea, and I'm wondering if there > is a standard way to do this. > > I want a "cape" which can be used to connect a BeagleBoneBlack with another > dev board in a manner to maximize flexibility. > > IE P8 pins 1 to 45 will connect to 45 pins on the other board, with the > assumption that > P8-1 and P8-2 will both connect to GROUND on the other board > > 3 to 45 will be used in GPIO mode on both boards and both boards are using > the same voltage levels. > > > However, since they are 2 dev boards, it's always possible that the hobbyist > will want to use the pins differently. For example, he might want to attach > an LCD to the Bone, using pins P8 28-45 in LCD mode. And he doesn't want > those signals being sent to the other dev board. > > Using larger parts, one could use dip switches or jumpers inline with the > connection. But that adds bulky parts to the board. > > What I'm thinking is that I could use a very low value SMD resistor for each > line - with the expectation that if the hobbyist wishes to disconnect a line > they will remove the SMD resistor. It's not as flexible as a jumper - but > it allows for the end user relatively easily disable some links if they need > to. > > Similarly, both boards provide some voltage rails for powering attached > chips. For example, P9-3 and P9-4 provides 3V Those power rails should > not connect from one board to the other in expected usage. However, it's > possible that the end user would prefer to use the 3V rails provided by the > bone for everything. As such, would it be appropriate to place 2 SMD diodes > on that line in opposition, with the expectation that the end user would > remove one of those diodes and replace it with a small resistor if they want > to use it? > > IE: P9-3 ---- 3V SMD Diode---><--- 3V SMD Diode---Other Boards 3v Rail > > The 2 diodes would block each other in "normal" operation, giving the hacker > the flexibility to switch usage if they want. > > > I'm assuming in my ignorance I am missing some more obvious solution/type of > part to use to configure this. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out.
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