Face detection has a wide range of application, we will learn how to do face detection in this tutorial.
Load KOI Extension: https://github.com/KittenBot/pxt-koi
Blocks for face detection:
Download the program to the Micro:bit, the pixel on the Micro:bit 把程式下載到Microbit上，可以看到Microbit的點陣隨著人臉的移動而移動。
We can use the map function to map a value to a new range.
Extension Version and Updates
There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.
2: Does KOI work with 3V input?
· A: No, KOI only works with 5V.