Seem to have lost communications to Arduino UNO R3

Projects General Guidance
1

Brand new to Arduino.
I cannot get the "Blinking" or "Hello World" sketches to work.
I have a green power-on light illuminated on the board.
The L, Tx, and Rx LED lights flicker when the sketches are uploaded, but the sketches do not perform.
I get no error messages at all.
The UNO was working yesterday but now it appears that the UNO will not accept any sketch upload. I was attempting to add an lcd display. When I run that sketch all I get is 16 white squares on the first line of the 16x2 display.
I have checked and rechecked BAUD compatibility, and even tried different BAUD rates.
I could not find any topic that helped solve the problem.

2

Disconnect the LCD (and any other components) from the Uno and try blink sketch again.

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3

I disconnected all the wires to the LCD and re-ran the Blink sketch.
No change. Still no blinking.

4

Are you sure the sketch is uploading correctly? Are you seeing an "upload completed" message on the IDE?

5

I get a pop-up window that states "Done uploading".

6

Hmm... don't recognize that. What version of the IDE are you using?

7

IDE version 2.3.2

8

I think it would be called a pop-up statement box.

9

Not familiar with 2.x. This old stick-in-the-mud is still on 1.8.19! Maybe that's normal.

Have you set blink sketch to blink the on-board LED?

If so, maybe try connecting an external LED +resistor to a different pin and see if it will blink that.

You don't have another Arduino connected to the same PC by any chance? Make sure you are selecting the COM port or device that appears/disappears when you plug/unplug the Uno.

10

I do not have another Arduino connected.
I placed an LED and resistor on Pin 13. I get three rapid blinks of the LED two times and then nothing.

11

I switched to Pin 10 and I don't get any blinking.

12

You said you tried the Hello World sketch? Did you see anything in Serial Monitor? (Don't forget to check baud rates)

If that is not working either, I don't have any more suggestions. To me it seems like your Uno is faulty.

Do you have any other Arduino to test?

13

I don't think it is a communications issue as I ran a loop test and could write a message and get a return message.
I just purchased another Arduino UNO and will see what happens with the new one.

Thank you for taking some time to try and assist, I did appreciate it.

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