Python parallel interface to control a stepper motor.

turn_motor(cycles, state, delay)

Turn motor 1.3 turns anti clockwise, slowly from 0:

$ python motor_position.py --cycle -1.3 --delay 0.5 --reset

+1 : Moving to internal state index 23, 0xd hex 345.00 degrees +0 : Moving to internal state index 22, 0x9 hex 330.00 degrees -1 : Moving to internal state index 21, 0xb hex 315.00 degrees -2 : Moving to internal state index 20, 0xa hex 300.00 degrees -3 : Moving to internal state index 19, 0xe hex 285.00 degrees ... -28 : Moving to internal state index 18, 0x6 hex 270.00 degrees -29 : Moving to internal state index 17, 0x7 hex 255.00 degrees Saved new state index 17 to file: motor_state.ini

Turn motor 45 degrees (eighth a turn) clockwise from its current position:

$ python motor_position.py --rotate 45

Read in current state position as 17 +18 : Moving to internal state index 18, 0x6 hex 270.00 degrees +19 : Moving to internal state index 19, 0xe hex 285.00 degrees +20 : Moving to internal state index 20, 0xa hex 300.00 degrees Saved new state index 20 to file: motor_state.ini

Turn motor to 270 degrees absolute angle, from the current 300 degrees angle.

$ python motor_position.py --angle 270

Read in current state position as 20 +21 : Moving to internal state index 19, 0xe hex 285.00 degrees +20 : Moving to internal state index 18, 0x6 hex 270.00 degrees Saved new state index 18 to file: motor_state.ini

• Assumes that at first, motor is in state 0 and will move to first index (0x07)
• There may be a slight loss in accuracy converting state to offset for calculating cycles
• Assumes that 0 index is 0 degrees. Could have an offset but easier to calibrate device or change order of motor inputs.