Adafruit-IR-Break-Beam-Sensor-5mm-LEDs-Adafruit-2168-P-The-Adafruit-IR-Break-Beam-Sensor-is-a-two-part-sensor-consisting-of-an-infra-red-emitter-&-a-separate-infra-red-receiver-which-react-when-an-object-interrupts-the-beam-between-them-They-are-faster-&-more-targeted-than-PIR-sensors-&-less-expensive-than-sonar-sensors-These-are-the-5mm-version-with-a-range-of-up-to-500mm-You-can-power-them-from-3-3-to-5V-DC-but-you-will-get-a-more-powerful-IR-beam-at-5V-The-receiver-is-open-co