> For the complete documentation index, see [llms.txt](https://sharinghub-eng.kittenbot.hk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sharinghub-eng.kittenbot.hk/educational-kit-sets/health-care-educational-ai-kit/health-care-educational-ai-kit-instructions-koi-2/contactless-door-bell.md).

# Contactless Door Bell

Touching public facilities is something that should be avoided during a pandemic. This model simulates a contactless door bell.

![](https://kittenbothk-eng.readthedocs.io/en/latest/_images/bell.png)

### Building Instructions

[Building Instructions Resource Pack Download](https://bit.ly/AIHealthCareSetBuildingGuide)

### Sample Wiring

![](https://kittenbothk-eng.readthedocs.io/en/latest/_images/bellcon.png)

### Sample Program

{% embed url="<https://makecode.microbit.org/_UVdMzChD5Jqw>" %}

[Contactless Door Bell](https://makecode.microbit.org/_UVdMzChD5Jqw)

### Model Instructions

1. Switch on the power and wait 10 seconds for the KOI to power on completely.
2. The model presses on the door bell when a face has been detected.