Actuation of shape memory alloys

Hi,

I am making a robotics project. I am using shape memory alloy wires in place of motors. I need help with the electronics part as I have no idea what I have to do. For example, which microprocessor to use, how to design the circuit, etc.

All I have to do is pass a current through one of the four wires joining two adjacent links, depending upon the direction I want the robot to move in. Like if I want to move it towards right I will actuate the wire on the right.

Any help will be highly appreciated.

Regards,
Mad Scientist