Face detection has a wide range of application, we will learn how to do face detection in this tutorial.
Load the KOI Extension: https://github.com/KittenBot/pxt-koi
Blocks for circle tracing:
Download the program to the Micro:bit, the pixel on the Micro:bit
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.
Q1: There is no reaction after pressing the buttons on the Micro:bit.
A1: This is because KOI has a longer boot time than Micro:bit. When the power is turned on, Micro:bit has already ran the code for KOI initialization before KOI is ready.
Solution: Reset your Micro:bit after KOI has been turned on. (The trick is to let KOI power on completely before initialization.)
Q2: Does KOI work with 3V input?
A2: No, KOI only works with 5V.
If you have any question, please feel free to contact us at Discord, we will always be there to help.