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This is an exceptionally lightweight,...
It lets you drive two DC motors with your Arduino board, controlling the speed and direction of each one independently. You can also measure the motor current absorption of each motor, among other features.
MotoMama is a motor drivers shield for Arduino, based on L298N H-bridge driver chip. You can use this shield to drive two DC motors or an four-wire two-phase stepper motors with Arduino boards.
This Arduino Compatible Motor Shield (2A) uses L298P chip which allow to drive two 7-12V DC motors with maximum 2A current.