On Tue, 12 May 2015 21:34:51 -0500, you wrote: >I trust that I might save the time of others who want to connect UART4 to >the Pi-2 UART: It is required to connect the ground of both boards.
Generally, two electronic systems talking to each other over wires (not fiber optics, and not ethernet, which uses isolation techniques) will need a common ground. This is especially true of either parallel port driven projects, or serial (I2C, SPI, CAN, RS-232, to name a few styles). MIDI uses isolation techniques. Just as when you measure a voltage, you need to measure with reference to something (typically a ground point), the other circuits that respond to that voltage need the same (and common) reference point. This is true unless there have been fairly special techniques used to bypass that need. Remembering this can save you lots of difficulty, however, when in doubt about connections, ask. Harvey > >-- > >Bill Barnett -- 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/d/optout.
