This might not be your problem, but it's important that both boards share a
common ground. The picture shown on the link you've given is missing a
wire. The two blue wires shown at the end of the breadboard are meant to
be connecting the two ground rails but don't as there is no wire bridging
the gap in the middle of the breadboard. You can bridge that gap or just
use a longer wire that goes from ground rail to ground rail (or arduino gnd
to beagle gnd directly). Many protocols (like rs-422, rs-485, ethernet,
usb, etc.) use a differential signal to allow communication even if grounds
are floating relative to each other but ordinary uarts and spi are
completely unreliable without tying ground potential together.
On Sat, Sep 6, 2014 at 8:09 PM, m34tc...@gmail.com wrote:
I am trying to enable serial communication between an arduino and
beaglebone black, for a home automation system.
I got it working once(the beaglebone printed data it was receiving) but
hasn't worked since. I followed this
http://www.instructables.com/id/How-to-make-a-BeagleBone-and-an-Arduino-communicat/
guide. My only thought is maybe somehow the Serial4 pins became damaged? If
so, how could I test the Beaglebones RX. Using another serial port is an
option, although I don't know how to use them.
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