Seeed arduino grove base shield v2 seeed studio 103030000 p the arduino grove base shield from seeed studio is switchable between 5v and 3 3v making it compatible with the official and a wide range of unofficial arduinos this board is the hub for a whole system of sensors actuators displays and more starting with simple leds and building to more complicated devices such as accelerometers bluetooth sound light temperature sensors the grove system seems to have one of everything you