Quantity   Component name
2 × BPW34 Opto and Fiber Optic Semiconductors and ICs / Photodiodes
1 × Capacitor 100uF or more
1 × LED ... RED or GREEN, smd, TH ... your choice
1 × MMBT2222ALT1G Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs