> 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/touch.md).

# Touch

![](https://451694785-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MPda5vaSVRKTQ6AoAmb%2Fuploads%2Fgit-blob-e533487df6f8230716ae31f5b23f1fe7d55f03e6%2Fimage.png?alt=media)

Touch sensitive switch. Touching the sensor pin produces an output at the ‘DO’ pin. The output is not a clean signal but includes 50 Hz mains induced signals (‘mains hum’). The output signal is ‘active high’ and the circuit sensitivity can be adjusted with a pot. An analog output signal from the sensor is available at pin ‘AO’.