They use a SPST-NO relay, and we need a SPDT relay. Fortunately, the fix is simple, just remove the relay and replace it with the one indicated above. I've chosen to tombstone (install it vertically ...
# GrovePi Example for using the Grove SPDT Relay(30A) (http://www.seeedstudio.com/wiki/Grove_-_SPDT_Relay(30A)) # The GrovePi connects the Raspberry Pi and Grove ...