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:¶
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¶
Extension Version and Updates¶
There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.
FAQ¶
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.