Quantity   Component name
1 × 8042 Microcontroller
1 × 2764 EPROM
1 × LED (optional) LED
1 × 1 kΩ resistor (optional) Resistor
1 × 6 or 12 MHz crystal Crystal
1 × 1N4148 Si diode or similar Diode
1 × TM1637 4 digit display module Serial interface LED display module
2 × Push button SP NO switch SPST normally open
2 × 22 kΩ resistor Resistor
1 × 1 μF capacitor Capacitor
2 × 0.1 μF capacitor Capacitor
2 × 22 pF capacitor Capacitor