Example code to blink an LED connected to an imp. It makes use of the imp’s DIGITAL_OUT GPIO pin setting.

digitalout-led.device.nut

// Assign pin9 to a global variable
led <- hardware.pin9;

// Configure LED pin for DIGITAL_OUTPUT, and set initial state to off
led.configure(DIGITAL_OUT, 0);
 
// Assign a global variable to track current state of LED pin
state <- 0;

// Function to blink LED
function blink() {
    // Flip the state variable: 1 -> 0, 0 -> 1
    state = (state == 1) ? 0 : 1;
    
    // Set LED pin to new value
    led.write(state);        
    
    // Schedule the blink function to run again in .5 seconds
    imp.wakeup(0.5, blink);
}

// Initial call to the blink function to begin looping
blink();