Quantity   Component name
1 × Real Time Clock Module Any DS1302 based module. I have opted for a module with a removable DIP packaged chip to help with further prototyping.
1 × Arduino Pro Nano or Pro Mini A clone is fine.
1 × 2.2KΩ Resistor Required for the V-USB interface.
2 × 68Ω Resistors Required for the V-USB interface.
2 × 3.6V Zener diodes Must be rated at 0.5W or less. Required for the V-USB interface.
1 × USB A plug and lead Required for the V-USB interface.
2 × Light Dependent Resistors Required for the screen reading interface.
2 × 10KΩ Resistor Required for the screen reading interface.