Quantity   Component name
1 × ATTINY84 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
3 × 74HC595D so16
1 × Battery Clip 20 mm MPD (Memory Protection Devices) BK-883-TR
4 × Tactile Switch B3F-10XX or similar
4 × 0.1uF capacitor (changed from 15pF) 0805
5 × 10k resistor 0805
20 × 100R resistor 0805
20 × LEDs 1206 , 2.1 v, 10 mA
1 × ISP header (optional)