Picture of Bipolar Stepper Motor
I had some stepper motors from broken  HP printers ,hard drive and other electronic devices  ,So I thought that it would be a good idea to make them work.
in the beginning I started with uni-polar stepper motor (5,6 wires) with ATMEGA8 MCU and ULN2003 driver  and it simply works  but for Bipolar stepper motor(4-wires),  it was real challenge to me to make it rotate because the polarity should be reveres in each steps  ,so after some web searching I found the solution with  L298 IC  which is 4 Amp. dual H-bridge driver.

Step 1: Materials

Picture of Materials
For H-Bridge Materials: 
1-  PCB (single side printed circuit board).
2-  L293 Dual H-bridge driver.
3-  100 uF capacitor.
4-  0.01 uF ceramic capacitor.
5- 7805 voltage regulator.
6-  N4001 diode (Qty. 8 diode).
7- 1/2 W 1 Ohm resistors (Qty. 2 resistors).
8- Sockets and wires.
9- Heat sink for L293.
10-Bipolar Stepper Motor.

For Controller Circuit :
1-  Atmega16 plus IC holder.
2- 100 uF capacitor.
3- 0.01 uF ceramic capacitor.
4- Socket for ISP.
5- 7805 voltage regulator.

Note that you need only one 7805 regulator but I used two because I made both circuit individually for test purpose.
peterlonz2 years ago
This looks reasonably simple so within reach of those of us who are not experts in electronics.
But I could not ID some of the components in your pic & I could not see the power supply.
Could not see either how speed & direction are controlled
Suggest the addition of a schematic or circuit would help a lot.
Also perhaps the cost & source of the more obscure components.
Good work though please keep it up.
sunshiine3 years ago
Beautiful plans! Congrats! Voted!
Husham Samir (author)  sunshiine3 years ago
Thank you