adafruit trinket 5v 8 MHz vs Arduino UNO for controling A4988 stepper driver

[revel]

I've prototyped a circuit and am now ready to solder the project. Can I swap out the Arduino for a trinket with a ATtiny85 onboard? Adafruit Trinket - Mini Microcontroller - 5V Logic : ID 1501 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits

it would run slower? If so, how to I compensate for that?

it seems to have accepted the code I've adapted for it along with the AccelStepper library.

I'd like to keep my $30 arduino, and send this project of with a more appropriate controller!

Thanks!

-Rev

[revel]

FWIW here is the code

// Bounce.pde
// -*- mode: C++ -*-
//
// Make a single stepper bounce from one limit to another
//
// Copyright (C) 2012 Mike McCauley
// $Id: Random.pde,v 1.1 2011/01/05 01:51:01 mikem Exp mikem $

#include <AccelStepper.h>

// Define a stepper and the pins it will use
AccelStepper stepper(1, 1,2); // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5

void setup()
{  
   pinMode(3,OUTPUT); // Enable
  pinMode(1,OUTPUT); // Step
  pinMode(2,OUTPUT); // Dir
  digitalWrite(4,LOW); // Set Enable low
  
  // full length rod, no microstepping
  stepper.setMaxSpeed(2300);
  stepper.setAcceleration(3700);
  stepper.moveTo(900);
}

void loop()
{
    // If at the end of travel go to the other end
    if (stepper.distanceToGo() == 0)
      stepper.moveTo(-stepper.currentPosition());

    stepper.run();
}

[MarkT]

I could guess that the top step rate will be 50% of a 16MHz Arduino, but I haven't read the
code to AccelStepper recently so might be wrong. If you are using microstepping you could
reduce the amount of microstepping to compensate for a slow maximum step rate, or use
a different stepper library or write your own code that is faster than AccelStepper.

[revel]

Here is a way to make the 5v trinket work at 16 MHz: 16MHz vs 8MHz Clock | Introducing Trinket | Adafruit Learning System

however, my code still doesn't run the same. I can solve the problem by changing some gearing, but, anyone know why that is?