A and B Buttons¶
KOI has 2 built in programmable buttons called A and B.
Using A and B Buttons¶
Load KOI Extension: https://github.com/KittenBot/pxt-koi¶
Blocks for buttons:
btnA and btnB refer to Button A and B respectively.
When the button is being pressed, it returns a value of 1. When it is not being pressed, it returns a value of 0.
Download the program to Micro:bit.
Pressing button A on the KOI causes Micro:bit to show a smiley face, pressing button B on the KOI causes Micro:bit to show a surprised face.
Extension Version and Updates¶
There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.
1: There is no reaction after pressing the buttons on the KOI.¶
· 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.