RX-TX Pin Upload Error EVEN WHEN RX-TX Pin Are Open

I have this PCB where I placed my Arduino. The RX and TX pin are connected to another component via PCB traces and female headers. I have not connected the component to the PCB so these pins are "open" (I have checked the PCB traces to make sure they connect directly to just a female headers pins on which I will place the other component). For some reason the upload won't work until I remove the Arduino from the PCB and then upload.

What is happening here? Why isn't the code uploading when the RX and TX pin are "open"/not connected to some component?

Please provide a schematic. Which Arduino?

You need Tx, Rx and RESET to be available. But it sounds like you MAY have something on the Rx or Tx lines!

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.