USBHID Keyboard Issues

[rtbroker]

Hey,
I am very new to Arduino and programming microcontrollers in general. I was hoping to get insight into a problem I recently had with the USB HID library. I loaded up the example provided which was:

#include "PluggableUSBHID.h"
#include "USBKeyboard.h"

USBKeyboard Keyboard;

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000);
  Keyboard.printf("Hello world\n\r");
}

This worked just fine, but I only wanted it to write out the string once so I modified it so it was this.

#include "PluggableUSBHID.h"
#include "USBKeyboard.h"

USBKeyboard Keyboard;

void setup() {
  Keyboard.printf("Hello world\n\r");
}

void loop() {
  // put your main code here, to run repeatedly:

}

The setup meant it should only run once, but the string wasn't written at all. Also, if I changed it so that I had a variable in the loop that only allowed the prinf() statement to run once, it also did not write it out.

I have tried a variety of different ways around, and none seemed to have worked. Could anyone help me with running the Keyboard.printf() only once?

Thanks in advance.

[bidrohini]

Hello, where is the "hello world" message supposed to be printed?

[bidrohini]

Looks like you need to call the function

keyboard.begin()

which I cannot see in your program.

Keyboard.print() - Arduino Reference

[rtbroker]

The Keyboard.begin() doesn't exist in the library I'm using. I'm forced to use the PluggableUSB Library because I'm using a raspi pico.

[sterretje]

If you search the forum for #include "PluggableUSBHID.h, you might find something that explains the behaviour.

I'm not familiar with the Pico but there are some issues reported when using it as a keyboard.