How to build a circuit for torque control using a DC motor, current sensor and arduino uno

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I have been tasked with designing a circuit that controls the output torque of a DC motor. The requirements are that the motor should operate at one of two torque values (inputted using a toggle switch). This should be done using an arduino uno as well as a DiodeZetex 5 pin current sensor. I am unsure of how to actually fit all of the components together - specifically, I am not sure how to use the current sensor or how to 'set' the current of the motor?

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duelagodu On

I'm assuming you are using a DC motor with permanent magnets. In the datasheet there should be a torque constant km (Nm/A). The torque M can then be calculated "ideally" with the formula M = km * I. The rest should be solvable with ohm's law and maybe some try and error.