INDEX

L298
Stepper motor driving with ULN2003
Stepper motor diriving with L293D
Another  motor driving circuit
 

For high current ratings up to 2A we use L298. The specialty of L298 is that it have odd number of pins(15) while every IC has even number of pins,second is that we have to use free wheeling diodes.
http://www.iitk.ac.in/eclub/Circuit/l298.htm
http://www.dprg.org/projects/1998-04a/
http://members.tripod.com/RoBoJRR/Motor%20III.htm
http://www.ece.cmu.edu/~ece578/lecture-notes/Motor-drivelecture/sld009.htm

Here there might be problems with inserting the IC in the breadboard and some pins may not be inserted properly. So first test that using continuity test between the pins of the IC and breadboard. The identification of the pins is the next. In the datasheet you can see that pin with short lead is
pin1. So remember this while connecting. The main problems occurring are IC is not inserted properly, absence of free wheeling diodes, pins are identified incorrectly.

Apply motor voltage to Vs and logic voltage +5v to Vss. Make enable to +5v and ground current sense pins. The remaining tests are same for L293D since we are using DC motor. For high current rating above 2A use LMD18200T H-bridge.