Let's Make Robots!

Stepper Motor Driver

Driving One Stepper Motor With L293D Using Two Pins

Question: Is it correct, that when I solder the following circuit there are only two pins nessessary
from the microcontroller to the L293D to drive a unipolar stepper motor ?

Answer: Yes. That is correct.

Question: Are the two NPN transistors and the 10kOhm pull-up resistors responsible for the signal inversion?

Answer: Yes. That is correct.


CNC electronics

I'm in the process of building a CNC machine right now and would like a little help from the experience ones.  Right now I have $250 saved up and counting.  I'm trying to figure out what to do about stepper motors, power supply, and motor controller.  I didn't know if it be best to just buy a package that have it all in one and what would you recommend.