Is there an LED on MangOH Green which can be controlled from userspace?
Either via /sys/class/leds, or from a command line tool?
We plan to release tutorials on this in the next day or so.
there is a user controllable LED on mangOH Green Rev 8.
In the mangOH green DV4 schematic on page 9, you can see that there is a GPIO on GPIO expander #1 labeled “connect_to_AV_LED”. This LED doesn’t serve any specific purpose in the system and thus it can be used as a general purpose LED. In order to configure the GPIO and control the LED, you will want to bind your application to the gpioExpanderService. If you don’t know how to do this, then I would suggest you wait a day or two until the tutorials that Ashish mentioned are posted.