Quantity   Component name
1 × DC barrel jack This jack allows many spare power supplies to be used to power the stepper https://www.sparkfun.com/products/119
1 × Rotary encoder This was just kicking around my parts bin but here is a similar one https://www.sparkfun.com/products/9117
1 × Pro Trinket (5v) https://www.adafruit.com/products/2000
1 × Easy Driver stepper driver https://www.sparkfun.com/products/12779
1 × 128x64 OLED screen I used this one (https://www.tindie.com/products/miker/096-oled-i2c-display/) , which has only 4 pins - NOTE you will need to alter the Eagle file if you use an Adafruit or Sparkfun one!
1 × 4-pole screw terminal block For stepper motor connection http://www.digikey.com/product-detail/en/0/ED10563-ND