Grove 電磁石

Works well - the board provides the necessary transistor, protection diode and resistors so no additional components are required. Note that you don't need a GrovePi kit or anything to make this work, just connect it to a 5V supply, ground and logic input as indicated. Works fine with a 3.3V logic signal (e.g. from a Raspberry Pi).

A nice module, but only strong when directly contacting ferrous material. I tried putting a 0.2mm ABS cover over it and it effectively couldn't hold more than a paperclip.

Fast delivery and works great

Works great, heats a little. I test it with a 0,5kg cylinder. I can pull it, but not lift it.