Face Recognition (KOI v1.9.5)

Face Recognition is the technology of recognizing individuals from an image. This function can be realized on KOI.

Face Recognition


Load KOI Extension: https://github.com/KittenBot/pxt-koi

Loading Extensions

Blocks for Face Recognition:


Sample Program:

Wifi connection is required for Face Recognition.

Face Recognition is a free feature, therefore you must choose a unique name for your class.
For example, common names like testing, test1, class01 are already made by others.
A maximum of 20 images can be stored in each class.


Program Flow

1: Download the program to Micro:bit.

2: Press A to store a face to the class.

3: After a shortwhile, KOI will display the gender and the age of the face detected.

You can change the name and reupload the program to store another face.

6: Press B to recognize a face

7: KOI will display the name of this face and its confidence. If a new face is detected, KOI will display “stranger”.

Confidence level can range from 0 to 100.

Face Recognition Demo Video


Extension Version and Updates

There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.

Makecode Extension Update


1: There is no reaction after pressing the buttons on the Micro:bit.

· A: 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.)

2: Does KOI work with 3V input?

· A: No, KOI only works with 5V.

3: KOI shows “Pic not has face” after taking a picture.

· A: This is normal because the focus may be off, try taking the picture again.

3: KOI shows “Get timeout” after taking a picture.

· A: This is because network conditions may not be good enough, or sometimes the server may be too busy.