Recording and Playback
With the built-in microphone and speaker, simple recording and playback is possible.
KOI can record a 3 second audio clip and saves the file as a wav format.
Install an SD Card
The pictures are stored onto an SD card, without an SD card, these operations would fail.
Recording and playback
Load KOI Extension: https://github.com/KittenBot/pxt-koi
Blocks for recording and playback:
Download the program to Micro:bit.
Press button A on the Micro:bit, KOI will record what you say.
Press button B on the Micro:bit, KOI will playback the audio file.
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.
3: Can I change the recording duration?
· A: No, because recording duration is limited by the amount of RAM that KOI has.
4: Can I play mp3 files on the KOI?
· A: No, KOI can only play wav files, and file size cannot exceed 512KB.
5: Can I create my own wav files to play on KOI?
· A： Yes but make sure the duration is less than 3.75 seconds with a bitrate of less than 512kbps. The file size has to be within 512KB.