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Hbridge

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I am relatively new to robotics, so here goes a dumb question. Since EzB can drive servos, what is the advantage or reason for using an Hbridge? Does it drive the same kind of servos or does it drive bigger servos?

Thanks.

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#1  

Servos are just one kind of motor. There are many other types... Servos have a built in H-bridge so you don't need an external one.... The h-bridge you are referring to is used to drive basic dc motors (not servos)... Remember a dc motor has only 2 wires and no electronic control board in them. So you will need an h-bridge to control them properly in order to move your robot forward, reverse and for speed control as well... You can't do much with a dc motor if you just hook them up directly to a battery... The motor will just spin at a constant speed and in one direction. You won't be able to control your robot... Use an h-bridge and now you can not only control the motors speed but it's direction as well...

For example Roli uses an h-bridge because the motors that drive his treads are 2 geared DC motors (not servos)....

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#2  

Richard. Thanks for the great explanation.

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