How to light the heartbeat LED?
Addition for the wiki, it took me a while to find out myself.
The heartbeat LED can be controlled from the daughter board. It is connected to pin 8.
Sample Arduino code:
#define HEARTBEAT (8) // inverted!
digitalWrite(HEARTBEAT, LOW); // switch light on
delay(2000) // wait 2 secs
digitalWrite(HEARTBEAT, HIGH); // switch light offRegards,
Jan-Willem Arnold