What is IR Sensor - IR Reveiver and Transmitter, Pinout, Specifications
IIVVERR 10Pcs CHT-1738 3 Long Pins Flat Infrared Remote Control Receiver IR LED Diode (10Pcs CHT-1738 3 P-ER-NO-S largos infrarrojos planos de control remoto receptor IR LED diodo - - Amazon.com
Super-bright 5mm IR LED [940nm] : ID 387 : $0.75 : Adafruit Industries, Unique & fun DIY electronics and kits
How to Connect an IR Photodiode Sensor in a Circuit | Homemade Circuit Projects