Line finder is designed for line following robotic. It consists of two parts - an IR emitting LED and an IR sensitive phototransistor. It can output digital signal to a microcontroller so the robot can reliably follow a black line on a white background or vice versa.
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For all Grove users (especially beginners), we provide you guidance PDF documents. Please download and read through Preface - Getting Started and Introduction to Grove before your use of the product.
Ready to use with microcontrollers as digital input. This product also has a compact modular design Plug-and-play grove compatible interface.
Based on the picture above, the grove shield for Arduino is stacked with Seeeduino V4.2. Of course you can use that shield with Arduino too :)