Displaying Text

English strings can be displayed on the KOI screen.

Displaying Text


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

Loading Extensions

Blocks for displaying text:


We can add a delay to specify the duration shown.

The coordinates refer to the top left corner of the text. See figure below for explaination of coordinates.


Sample Program:



Download the program to Micro:bit.

Pressing button A on the Micro:bit to display “Kittenbot” on the screen. Pressing button B to display “KOI” for 2 seconds.

Sample Code

Displaying Text (Extension0.5.7)

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: Why does the text disappear after a short while?

· A: Since the dislay of the KOI keeps refreshing, the text cannot persist on the screen for a long time. For displaying persisting text, considering connecting an I2C OLED screen.