Line Tracing
Last updated
Last updated
ine Tracing is usually used in line tracing robots, we will learn how to obtain the coordinates of the line (x1,y1) & (x2,y2 )in this tutorial.
Search "KOI" in the search bar.
Or copy and paste the following link to the search bar.
https://github.com/KittenBot/pxt-koi
Blocks for Line Tracing:
Line Tracing and Blob Tracing both require calibration before using.
During calibration, a small green square will appear on the screen. Aim the square at the color you intend to track. The calibration will be done automatically.
It is recommended to have a distinct difference between the color you intend to track and the background.
Download the program to the Micro:bit.
Put a thin object in front of the camera and press A to calibrate color.
After calibration, the coordinates of the line will be shown on the screen.
The information becomes more easily readable if we add an OLED screen.
Connect an OLED panel to the I2C port of your Robotbit/Armourbit.
The program works the same way as the normal program, but now the coordinates are displayed on the oled.
1. Line Tracing (Extension0.5.7)
2. Line Tracing /w OLED (Extension0.5.7)
There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.
· 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.)
· A: No, KOI only works with 5V.
· A: Keep a clean background and use a color that is significantly different from the background.
