when I use Keyboard.h, could I press keycode instead of keyASCII？

[ljq29]

It is generally accepted that when the header file Keyboard.h is used, some control keys can be sent through the Keyboard.press (key) function. But for keys without ASCII values, such as KEYCODE_VOLUME_UP and KEYCODE_VOLUME_DOWN, how should they be sent to the host through arduino?

[anaicagrouver]

0x80 Keyboard Volume Up
0x81 Keyboard Volume Down
0x7F Keyboard Mute
You can also see the list here

[thekunalsaini]

@ljq29 you can use hex codes for this

[ljq29]

@ljq29 you can use hex codes for this

So, from where I can find the table of keycode 2 hex?

[edgar-bonet]

KEYCODE_VOLUME_UP and KEYCODE_VOLUME_DOWN

On the keyboards I tried, these keys use a different endpoint and a different protocol than all the “regular” keys. They can thus not be sent by the Keyboard library. Not without heavy modifications.

[ljq29]

KEYCODE_VOLUME_UP and KEYCODE_VOLUME_DOWN

On the keyboards I tried, these keys use a different endpoint and a different protocol than all the “regular” keys. They can thus not be sent by the Keyboard library. Not without heavy modifications.

What about functional keyboard? Some keyboard do have VOLUME_UP and VOLUME_DOWN key, such as logitech K380.

[edgar-bonet]

@ljq29: Yes, that is what I am talking about. I have a couple of keyboards that, in addition to all the regular keys, have these VOLUME_UP and VOLUME_DOWN keys. My tests show that those keys are sent through a different USB endpoint.

[ljq29]

@ljq29: Yes, that is what I am talking about. I have a couple of keyboards that, in addition to all the regular keys, have these VOLUME_UP and VOLUME_DOWN keys. My tests show that those keys are sent through a different USB endpoint.

So, is this libraries will not support VOLUME_DOWN and VOLUME_UP keys?

[edgar-bonet]

@ljq29: Indeed. This library does not support the VOLUME_DOWN and VOLUME_UP keys.