Seeed 101020172 Grove - Line Finder v1.1

Seeed-Line-Finder-Seeed-Studio-101020172-p-Seeed-101020172-Grove-Line-Finder-v1-1-is-designed-for-a-line-following-robot-It-has-an-IR-emitting-LED-and-an-IR-sensitive-phototransistor-which-can-output-a-digital-signal-to-a-microcontroller-so-that-the-robot-can-follow-a-black-line-on-a-white-background-or-vice-versa-p-p-The-eye-like-sensors-on-the-board-are-actually-IR-emitting-LED-and-sensitive-phototransistor-When-the-phototransistor-detects-the-reflected-infrared-light-from-the-IR-em

Price: £ 4.74 from Rapid Online Rapid Electronics Ltd.