controlling stepper motor without pc

[kerimtemel]

i want to control x-y table without pc and draw a circle. it is my final projekt. please help me .........

[CNCgr]

You can use a microcontroller (e.g. a PIC).

If you want linear motion only you can use a step-dir IC and make a timer circuit with a 555 to provide step pulses. This way you can control direction and feedrate (with a potentiometer). You can't do a circle this way though...

Nikolas

[pminmo]

How versed are you in electonics? What are the x-y table inputs? You could precalculate all the information, or you could use a simple microcontroller such as an AVR or PIC.

Phil

[bkukowski]

www.parallax.com you can make a pbasic program and use continuous rotation servos to drive the axis (just an idea) It does require a windows pc with a serial port to program but after that it can run by itself. A starter kit is $80. not sure if their servos have the torque though...

[CNCgr]

A starter kit is $80.

A PIC + parts for a programmer would be 20$. I have a Basic Stamp but I wouldn't buy it again...