Voice Recognition (Firmware v1.9.5 or above)

KOI is able to recognize our commands after training.

Recognizing Voice Commands


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

Loading Extensions

Blocks for voice recognition:


Sample Program


Program Flow

1: Download the program to the Micro:bit.

2: Press A and record the first command. A green color will be shown if the command has been successfully added. Otherwise red will be shown.

3: Press B to continue, you can now repeak step 2 and record the next command.

4: Repeat step 2-3 to record all your commands.

    AI Camera KOI has the capacity for 10 voice samples.

5: Press A and B at the same time to recognize a command. A green color will be shown if KOI successfully recognizes your command, else it will show a red color. The command ID will be shown on Micro:bit.

Voice 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 displays red everytime I try to record my command.

· A: The noise level hasn’t been calibrated, it is essential to run the block before voice recognition.