Quantity   Component name
1 × SAM D11C Atmel 32 bit ARM M0+ with a whopping 16KB of flash and 4KB of RAM
1 × LM324 Quad Op Amp
20 × LEDs Electronic Components / Misc. Electronic Components
1 × Piezo Disc 12mm
1 × AP2112K-3.3 3.3v LDO
1 × 20mm battery holder
1 × MBR120 Discrete Semiconductors / Diodes and Rectifiers
6 × Capacitors
15 × Resistors
2 × Momentary switches