KOI is able to find and track rectangles in a scene.
Load the KOI Extension: https://github.com/KittenBot/pxt-koi
Blocks for rectangle tracing:
Threshold affects the detection rate, testing and fine tuning the value is needed for achieving the best results.
A higher threshold value decreases interference and noise, but detection difficulty increases at the same time, please trial and fine tune for different scenarios.
Download the program to Micro:bit, then press A on the Micro:bit.
The coordinates and dimenions of the rectangle are shown on the KOI.
The information becomes more easily readable if we add an OLED screen.
Connecting an OLED
Connect an OLED panel to the I2C port of your Robotbit/Armourbit.
Load the extension for OLED: https://github.com/KittenBot/pxt-oled
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: How do I improve detection rate?
· Adjust the threshold value.
· Keep a clean background.
· Make sure the rectangle has a sharp outline.