Simple stepper motor drive.

This is a basic interface to command step/direction motor drivers.

Hardware connections.

The default pinout is:

    AXIS_0_PIN_STEP             11
    AXIS_0_PIN_DIR              12
    AXIS_0_PIN_ENABLE           13

    AXIS_1_PIN_STEP             7
    AXIS_1_PIN_DIR              8
    AXIS_1_PIN_ENABLE           9

Protocol.

The default serial speed is 57600 baud.

The control message format is:

\n[AXIS][SPEED]\n

Where AXIS is one of A, B (uppercase) and speed is the desired steps per second for that axis. Negative speeds toggle direction.

For example:

\nA12345\n

If the driver does not get an update from the host after 100 milliseconds that axis is stopped as a security measure.

Compiling

We are using PlatformIO but it works fine under the Arduino IDE too.