I have an Arduino r3 mega328p, selected from Tools > Board "Arduino Uno", selected the only port i have Com1. I made a test with a led, the board works. When i try to upload a new programm it taks a while and i get this error: Arduino: 1.8.16 (Windows 10), Board: "Arduino Uno" Sketch uses 1050 by…

PCI Lookup says it's an HL-340 USB-Serial adapter. A quick google for HL340 driver brings up a lot of hits. Install the driver and you should be good to go.

Arduino Uno can't upload program

Development Tools IDE 1.x

sterretje September 20, 2021, 10:49am 8

The 328P is not the one closest to the USB port.

And COM1 is not the unknown device; Windowsknows what to do with it and hence it's COM1 and not unknown.

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Arduino Uno can't upload program

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