HiLetgo 20pcs 5MM Photo Transistor Phototransistor PT334-6C Photo Transistor Phototransistor Round F5 3V

GeeBat 10pcs Mini Laser Dot Diode Module Head Red 650nm 6mm 5V 5mW Diode Lasers

Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Arduino (Pack of 20pcs) EK8443

20Pcs AMBIENT LIGHT SENSOR Ambient Light Sensors IR-BLOCKING Silicon Phototransistor

DTOL 10 X Mini Laser Dot Diode Module Head WL Red 650nm 6mm 5V 5mW Pack of 10

Phototransistors Phototransistor (10 pieces)

DROK Four Wires Light Detection Photosensitive Sensor Module Photodiode With Directional Property

GeeBat 120pcs 150V 5mm Photoresistor Kit, Photo resistor 5506 5516 5528 5537 5539 5549, GL5506 GL5516 GL5528 GL5537 GM5539 GL5549 LDR Photo Resistors Light Sensitive Light-dependen Optoresistor

Elegoo 17 Values 1% Resistor Kit Assortment, 0 Ohm-1M Ohm (Pack of 525) RoHS Compliant

ELEGOO 3pcs MB-102 Breadboard 830 Point Solderless Prototype PCB Board Kit for Arduino Proto Shield Distribution Connecting Blocks

UA741 General-Purpose Operational Amplifier DIP8 1 Piece