Quantity   Component name
1 × Bearing This is the widely available roller skates bearing
1 × 9V battery 9 V alkaline widely available (bought in pack of 8)
1 × Rocker switch
1 × Geared motor 60 rpm 12 V DC
1 × Battery clip
2 × Rubber sheet This is sandwiched between the Rotisseries to grip the test tubes. Multiple options available on Amazon or similar
4 × O-rings
1 × Adafruit Pro Trinket – 5V This can be purchased either from Amazon or Adafruit or similar
1 × Motor driver controller L298N This is the most commonly available type and can be purchased from Amazon or similar
1 × 12 V DC supply adaptor 12 V supply is provided using an adapter that can be purchased from Amazon or similar
1 × 5.5 mm Jack Connector Socket Can be purchased from Amazon or similar