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Topic: Prolem loading sketch to pro mini (Read 227 times) previous topic - next topic


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Hi guys/girls.

Just got a pro mini and a Ft232rl serial adapter and I cant get my sketch to load.

heres my error code

Arduino: 1.8.1 (Windows 10), Board: "Arduino Pro or Pro Mini, ATmega328 (5V, 16 MHz)"

Sketch uses 1932 bytes (6%) of program storage space. Maximum is 30720 bytes.
Global variables use 91 bytes (4%) of dynamic memory, leaving 1957 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\\.\COM3": The system cannot find the file specified.

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.



"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.
I speak for myself, not Arduino.


Select the COM port of the Ft232rl serial adapter from the Tools > Port menu. If the menu is disabled or the correct port is not listed then the problem may be:
  • You need to install the driver
  • You are using a charging-only USB cable
  • You are using a defective USB cable
  • You are using a USB 3.0 port on your computer


hahaha yeah idk what happened there,

I just downloaded the latest IDE and I've selected pro mini in the tools and selected the 5v 16hz 328.

I have it plugged in and there is power and it appears to be running the blink sketch with the onboard LED.

I've downloaded the driver for Windows 10 and I'm pretty sure the USB is NOT charge only. (I use it to get pics off my goPro)


But what about the Tools > Port menu? After you plug in the Ft232rl serial adapter to your computer do you see a new port appear on the menu?


ok, I think it worked. I think there was an issue with my extra USB bar being plugged in...

Thanks guys, hopefully I wont have issues when I wire it to my project.

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