MOSFETs instead of relays?

[Trumpkin]

In the "Build Your Own Butler Robot" tutorial couldn't you use Power MOSFETs instead of relays? It seems like MOSFETs would be a lot smaller and cheaper than relays.

[MaltiK]

MOSFETS capable of driving the motors he used were, as he mentioned, beyond his budget.

Also I dont know if you can connect MOSFETS directly to the output of the phidgets like what he did with the relays, I am not sure but I think you need a middleman, an MCU.

[Trumpkin]

Wouldn't this H-bridge work? http://www.societyofrobots.com/schematics_h-bridgedes.shtml

[MaltiK]

I always found it wierd that due to the small size of MOSFETs, it would be really hard for me atleast, to accept the fact that they can power motors with as high a current stall as 25amps...