GPIO

Access to the GPIO on the mainboard (Raspberry PI) is handled via the GPIO class.

if __name__ == '__main__':
    from kervi.application import Application
    APP = Application()

    #Get access to main board GPIO
    #To work you must import it after you have create the application
    from kervi.hal import GPIO

    GPIO["gpio21"].define_as_input()

    #Link to dashboard it will show as a read only switch.
    #If the the GPIO 21 pin is set high, the switch will change to on.
    GPIO["gpio121"].link_to_dashboard()

    GPIO["gpio20"].define_as_output()
    #Link to dashboard it will show as a switch
    #Press the button on screen to turn the GPIO pin 20 high
    GPIO["gpio20"].link_to_dashboard()

    APP.run()

You can also set the value in code

if __name__ == '__main__':
    from kervi.application import Application
    APP = Application()

    #Get access to main board GPIO
    from kervi.hal import GPIO

    GPIO["gpio21"].define_as_output()

    from kervi.action import action
    import time

    #This action is called when the system has loaded
    @action
    def app_main()
        GPIO["gpio21"].value = True
        time.sleep(2)
        GPIO["gpio21"].value = False

    APP.run()

Read more about all the possibilities with gpio here.