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Arduino UNO Serial Port Problems [message #3229] Wed, 13 July 2016 19:28
kc2nda is currently offline  kc2nda
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Registered: December 2004
Location: New Paltz
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If you want to use a serial device with the Arduino UNO, you have to make sure that you know that the serial lines RX/TX pins 0/1 respectively are tied to the USB. This means if you want to use a serial device on these pins, you must remove the RX pin in order to upload the sketch to the Arduino. If the pin is not removed, there will be an error message on uploading the sketch.

Once the sketch has been compiled and uploaded, you can put the RX pin back on. You cannot debug and use the serial port at the same time unless your device doesn't care that you are sending debug data to it.

If you want a good board to be able to debug and use a serial device at the same time use a Leonardo.
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