Quantity   Component name
1 × Banana Pi Started with Raspi B+ but Banana Pi has better performance. Raspi2 should do just fine.
3 × Momentary SPST NO Green Round Cap Push Button Switch From Amazon
1 × Headphones (Phillips)
1 × Rotary Encoder
1 × Recycled Amazon cardboard box Clearly the enclosure needs some work
1 × MPL3155 (optional) Temperature and air pressure sensor