KOI - Face Recognition (KOI v1.9.5)

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

Face Recognition


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

Loading Extensions

Blocks for Voice 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 the 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.

4: Press B to recognize a face
5: 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.


Sample Code

1. Face Recognition(Firmware1.12.0_Extension0.5.7)


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



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.

Q3: KOI shows “Pic not has face” after taking a picture.

A3: This is normal because the focus may be off, try taking the picture again.

Q4: KOI shows “Get timeout” after taking a picture.

A4: This is because network conditions may not be good enough, or sometimes the server may be too busy.


If you have any question, please feel free to contact us at Discord, we will always be there to help.


KittenBot Team



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