I am wanting to do a project using the serial UART port but want to know if using that port (TX/RX) prevents me from using the USB to download? It wasn't clear to me from the description how to use both. I would not need to use them simultaneously.

I will be using both the Arduino Micro and probably an Arduino Uno, both driving a Ciseco SRF Shield.

Thanks for any help on that.


You cannot use both at once. During uploading via USB Rx pin at least must be disconnected from other device otherwise it is unable to upload. Except uploading the UART pins can be used normally as other pins.

Thanks! So I just need to physically disconnect Rx when uploading. That's easy enough.