> 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/two-color-5mm.md).

# Two-Color 5mm

![](https://451694785-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MPda5vaSVRKTQ6AoAmb%2Fuploads%2Fgit-blob-bab5dffba8af77f48ebe96d423c7858ad0076f8c%2Fimage.png?alt=media)

The 5mm LED has a common cathode connected to the ‘-‘ pin on the PCB. The centre pin connects to the red anode and the ‘S’ pin connects to the green anode. No series resistor is included in the circuit. A suitable value for low voltage operation would be 220 ohms.