Quantity   Component name
1 × ATSAMD21E18A-MU microcontroller
2 × 1µF 0604 capacitor capacitor
1 × AP2112K-3.3TRG1 low drop-out voltage regulator
2 × 5.1kΩ 0604 resistor
1 × 1kΩ 0604 resistor
1 × 0604 yellow LED