Hi Mark,
Thanks for your suggestions. I'm going to make another attempt at this. I'm trying a new Arduino board. I wanted to attempt a low speed rotation and need to check if I'm calculating things correctly. If I understand things correctly; the delayMicroseconds value determines the motor rotation speed. If I use a delay of 5000 microseconds in the code that would be 5000 microseconds High and 5000 Microseconds LOW and the Period would be 10000 Microseconds. That would make the shaft rotation frequency 1/Period = 1/10000 us =1/.01 sec =100 cycles/sec. Do I have that right? I'm not sure how that works out with steps or microsteps. I'm going to set the driver at 400 steps/rev.
Thanks Kirk