WMCommonsRaspberryPi4.jpg This feature is only available on the Raspberry Pi version of Scratch 3.0. No other version has it.
When Button () is ()
when button (0 v) is [pressed v] :: extension hat
Category Raspberry Pi Simple Electronics
Type Hat
Introduced in 3.0

The when button () is () block is a Raspberry Pi Simple Electronics block and a hat block. In the first option, numbers 0 through 27 can be inputted, with each number representing a GPIO pin. The second options are "pressed" and "released". The block activates when the specified LED is pressed or released, depending on the input.