Software Serial

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having trouble getting serial information through arduino using other usb serial interface. according tutorial, should able send i/o through digital pins.
http://arduino.cc/en/reference/softwareserialexample
however, i've been getting odd results. when plug in external power , serial cables, led on pin 13 light up; however, continues light after unplug serial cable, i'm not getting result want. thoughts?

how converting serial signal levels ttl levels used arduino?


Arduino Forum > Forum 2005-2010 (read only) > Software > Interfacing > Software Serial


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