Quantity   Component name
1 × Headless Ghost http://headlessghost.com/
1 × HDMI adapter jack https://www.amazon.de/gp/product/B003BCQP80/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
1 × Raspberry Pi
4 × wires
2 × 4.7kOhm resistors [CAUTION: read details] used to pull up SDA and SCL on microcontrollers with no built-in pull-up resistors