Example code to sample a button connected to an imp. It makes use of the imp’s DIGITAL_IN GPIO pin setting.

digitalin-led.device.nut

// Alias the GPIO pin as 'button'
button <- hardware.pin1;
 
function buttonPress() {
    local state = button.read();
    if (state == 1) {
        // The button is released
        server.log("Release");
    } else {
        // The button is pressed
        server.log("Press");
    }
}
 
// Configure the button to call buttonPress() when the pin's state changes
button.configure(DIGITAL_IN_PULLUP, buttonPress);