Project Help !! TFT, Hall Effect Sensor, and stepper duration.

hello guys,

i'm working project need little on it.  i'm looking suggestions , brainstorming. think have idea how work, need more info. there more 1 way achieve this, i'm in limbo land @ point not being able decide way go.  or maybe i'm wrong , can't achieve i'm going after.

current project stepper run @ 66 rpm 1 minute.  other  things involved in project 7inch tft press "start test buttons" , "reset button".  button presses on tft will  cw start, ccw start, , reset.  there hall effect sensor display rpm make sure shaft running @ 66rpm. stepper needs throttle 66 rpm.  been looking @ accelstepper library.  have used accelstepper in past on other projects using steppers.  never used in type of application.   

the hardware being used in project nema 34, 13.5nm stepper, ma860h microstep driver, 350 watt power supply stepper , , sainsmart hall effect sensor non latching speed readout on tft. arduino due.

currently have done research on

http://gammon.com.au/interrupts

http://forum.arduino.cc/index.php?topic=223286.msg1618246#msg1618246 = demonstration code

several things @ same time.

i know hall effect sensors used in conjunction isr, don't know how going effect stepper output or speed.  have ui elements designed in function called once in beginning , far am.  please feedback great.

thank you,

ryan 

quote

there hall effect sensor display rpm make sure shaft running @ 66rpm.

that's unusual way use stepper.   normally, you'd have home-sensor (or 2 limit-sensors) find starting position , trust motor take step every time it's supposed to.     (you can count steps home make sure haven't lost steps.)   normally, you'd find home @ power-on/reset.  or if it's kind of cycling operation, @ beginning of each cycle.

or, there may applications don't care particular starting position , don't need home sensor.

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