Seeed grove motion sensor control and actuator modules seeed studio 101020073 the grove electromagnet from seeed studio will hold up to 1kg when energised with only 400ma at 5v dc because this current is beyond the capability of most microcontrollers there is an on board logic mosfet that can be switched on by a low current logic signal seeed provide technical documentation example projects and software libraries on their product pages if you require this information please visit this pr