> For the complete documentation index, see [llms.txt](https://learn.arduinosa.co.za/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.arduinosa.co.za/sensor-kits/37-in-1-sensor-kit/tracking.md).

# Tracking

![](https://451694785-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MPda5vaSVRKTQ6AoAmb%2Fuploads%2Fgit-blob-12c41e04f34ded40b34213ae6d30e61cfb1a1ee7%2Fimage.png?alt=media)

IR light reflection switch, useful for obstacle avoidance or line following on models that move around the floor. An obstacle in front of the sender/receiver diodes will cause the ‘out’ pin to be pulled low (active low). A pot allows adjustment of the circuit’s sensitivity. The detection distance can be up to approximately 1 cm.