Hallo!
I'm playing around with the latest arduino object for pd, and it seems that there is a disconnect between the numbering for port I/O data-direction, and setting the value of a pin. I'm using the arduino-test.pd patch, as well as the [pd DIGITAL-OUTPUT] behavior pulled from the arduino help patch.
I don't really understand this - you mean you can set input/output mode for pin 13 with toggle 6 (and please try it in the help-patch) ?
p.s. also, clicking the "pulse all outputs" box in arduino-test.pd crashes PD after a few seconds - I suspect due to a comport problem..
Do you have the latest firmware and have you tried the PWN-OUT of the help patch?
LG Georg