With this board you can drive a stepper motor (unipolar or bipolar) and read two (end-)switches. Instead of a stepper motor it is possible to connect up to 4 relays to this board.

With a row of straps you can select the 6 I/O-lines of the 515/535-mainboard that you are planning to use to drive the stepper motor or relays (4 for the motor and 2 for the end switches).

You can combine up to 4 boards on one 515/535-system. The steppermotorboard can drive motors up to 8 Amps, but that would request a very heavy power supply.

I use this board to rotate my satellite-dish with two relays and one input for a reed-contact.

The steppermotorboard

The steppermotorboard with a heavy stepper motor

Unipolar stepper motor step sequence

Full step sequence and half step-sequence

Bipolar stepper motor

Alternate full step sequence
(provides more torque)

Here are some pictures of a drill-machine for PCB beeing made with the
steppermotorboards. Click on the pictures for more details.

Here a small film while the machine is drilling

And here a bigger one