ITR20001/T Miniature Reflective Infrared Optical Sensors (Pack of 5)
These sensors are handy when you want to detect if something has passed by the sensor, or a very simple hand-detector. Also sometimes these are used as rotary encoder, if the encoder wheel has black and white stripes, the photo sensor is fast enough to tell you the RPM. Most common usage of these sensors is for line following robots, they're so small and easy to solder, you can pack them together very close.
This sensor is compact, breadboard friendly and easy to solder to. It even has handy markings on the plastic so you know which side is the LED and which side is the phototransistor output. We don't include any 470Ω -1KΩ resistors for the Infrared LED, or a 10KΩ for the output pullup. But you do get a pack of 5!
This works best when detecting a light-colored object approximately 5mm away - 2mm to 10mm worked fairly well but your results may vary with the LED brightness, object shininess, etc.