How can I control stepping motor with PCI-7344 & UMI-7764? And I want to know the simplest circuit that I can do by myself?

[Seal Lee]

Now I don't want to by commercial stepping motor driver, I want to do it by myself. I want to know the simplest driver circuit to drive and control my stepping motor (+5V 4 phases).

[Kyle_V]

From the 7344's perspective, in open loop stepper mode, the only necessary outputs are the pulse train for steps and a TTL flag for direction. You can also set it for CW/CCW mode, which will output two separate pulse trains: one for clockwise motion, one for counter-clockwise motion.

If you only need to decode the signals into four phases and not amplify them above 5V, then a small IC might work for you (as long as you don't need a lot of current). A reconfigurable FPGA could be programmed to decode the incoming signal and output the four phases pretty easily. However, I honestly believe your best bet is just to buy a recommended amplifier for the motors.

Good Luck

Kyle V
Applications Engineer
National Instruments