What is the data sheet voltage drop across that h-bridge? If it is 1-2v then the motor might be ok. A diode in series on the power supply could provide another .7v drop.
The datasheet I posted doesn't seem to list that information; the closest thing to an answer I could find was:
Output voltage range, VO: –3 V to VCC2 + 3 V
Where VCC2 is 4.5-36 V - so at the lowest input voltage of 4.5 VDC, the output could go as low a -3V and as high as +7.5V; I'm not sure whether that means a "yes" or a "no", actually (leaning towards yes, gut feeling).
:-?
If you had a space 293 laying around, it would be worth trying, but I'd hate to be wrong and recommend buying an entire Arduino shield that wouldn't work.
Though as Danrosey points out, he's only playing around, so if the shield interests him and he thinks he could use it for something else in the future (which I'm sure he could!), maybe he should go for it!
