Quantity   Component name
1 × Arduino UNO R3
1 × Display OLED 1.3'' I2C SSH1106, 128x64 px
1 × IC PCF8574 Expander I/O
4 × LED-button
1 × Buzzer
4 × 10kOhm resistor Pull-down for buttons
4 × 390Ohm resistor Current-limiter for LED
1 × 100kOhm resistor
1 × power supply 5V optional
1 × Breadboard Electronic Components / Misc. Electronic Components
30 × Jumper Electronic Components / Misc. Electronic Components