Text-to-Speech (KOI v1.9.5)

By using BaiduAI, KOI can realize Text-to-Speech.

Using Text to Speech


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

Loading Extensions

Blocks for Text to Speech:


Sample Program:

Wifi connection is required to use text to speech function.


Program Flow

1: Download the program to the Micro:bit.

2: Press A and KOI will say “Hello” in English.

3: Press B and KOI will say “Good Morning” and “I am happy” in English.

The text to speech function only supports short phrases(2-3 words) and there must be no spaces between the words.

4: Press A and B and KOI will say “123” in Putonghua.

MakeCode does not support Chinese chracters but BaiduAI does, so BaiduAI will treat numbers as Chinese.

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.