Arduino Leonardo error

Using Arduino Programming Questions
1

I got my Arduino Leonardo connected to my computer for the first time and it's coming up with an error...

I ignored the error and used the Arduino compiler to upload the code to the Leonardo

Here is the code:

void setup()
{
  pinMode(2, INPUT);
  digitalWrite(2,HIGH);
  
  Keyboard.begin();
  
  while(digitalRead(2))
  {
  }
  
  Keyboard.println("Arduino Leo Keyboard function test");
  delay(1000);
  Keyboard.println("Test version 1.0.1");
  delay(1000);
  Keyboard.write(48); // character 0
  delay(2500);
  Keyboard.press(KEY_BACKSPACE);
  delay(1000);
  Keyboard.releaseAll();
  
}

void loop()
{
}

When I try to upload, an error message pops up: "Couldn't find a Leonardo on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board's rest button after initiating the upload." (There is a reset button but it doesn't seem to work... :cold_sweat: or I'm not using it right)

When I click "Serial Port Monitor" on "Tools" bar, again an error message pops up: "Serial port 'COM6' not found. Did you select the right one from the Tools > Serial Port Menu?"

Questions:

  1. How do I rest the Arduino Leonardo board?
  2. How do I upload any code to Arduino Leonardo board?
2

Immediately after starting the upload press and release reset on the Leonardo. With luck it should upload correctly then.

3

Still comes up with that same error... :frowning: (I've tried many different USB ports on my laptop...)

4

Same problem in a different thread: Arduino Forum
The solution there fixed this problem for me too.

5

When uploading the programs ,press the reset button immediately. And then ,in this moment ,find Tool > port > COM4(the port you used) before uploading be done. It's work!!

6

why is that happening with Leonardo ? - I've never had such problems with 328-based and Mega arduinos ?

7

I have a similar happening, I have a Leonardo clone (A-Star 32U4 Prime LV microSD).
I was using 1.6.? and with simple read analog test prog. The Serial Monitor would only occasionally work - most of the time it would not even open.
So - foolishly - I upgraded to 1.8.2 which promptly blew up - would not even upload the compiled code.
The averdude looked for COM5, didn't find it, found COM4 started upload and blew on Java unhandled error - several pages of it. At least 1.6.? uploaded OK, just would not do serial monitor most of the time - when it did it found it on com4 - when it was unhappy it just looked at com5 and refused to open.
Not very happy, but is that the price I pay for not buying a real Leonardo ?
I could clutter this post with the java error log, but will only give it if asked.
Regards Mike

8

Have you selected the correct port from the Tools > Port menu?

9