20. Two Channels Tracking Module(EF05019)¶

20.1. Introduction¶

The two channels Tracking Module has integrated two groups of reflective infrared pair diode, which can be used to make line tracking smart cars.

../_images/05019_01.png

20.2. Products Link¶

ELECFREAKS PlanetX PIR Sensor

20.3. Characteristic¶

Designed in RJ11 connections, easy to plug.

20.4. Specification¶

20.5. Outlook¶

../_images/05019_02.png

20.6. Quick to Start¶

20.6.1. Materials Required and Diagram¶

Connect the Two channels tracking module to J1 port in the Nezha expansion board as the picture shows.

../_images/05019_03.png

20.7. MakeCode Programming¶

20.7.1. Step 1¶

Click “Advanced” in the MakeCode drawer to see more choices.

../_images/05001_04.png

We need to add a package for programming, . Click “Extensions” in the bottom of the drawer and search with “PlanetX” in the dialogue box to download it.

../_images/05001_05.png

Note: If you met a tip indicating that the codebase will be deleted due to incompatibility, you may continue as the tips say or build a new project in the menu.

20.7.2. Step 2¶

20.7.3. Code as below:¶

../_images/05019_06.png

20.7.4. Link¶

Link: https://makecode.microbit.org/_hy3VDtA3xAqE

You may also download it directly below:

20.7.5. Result¶

Different icons display on the micro:bit in accordance with the different status detected by the tracking module.

20.8. Python Programming¶

20.8.1. Step 1¶

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor

../_images/05001_072.png

We need to add enum.py and tracking.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add enum.py and tracking.py from the unzipped package of PlanetX_MicroPython.

../_images/05001_081.png ../_images/05001_091.png ../_images/05019_10.png

20.8.2. Step 2¶

20.8.3. Reference¶

from microbit import *
from enum import *
from tracking import *

tracking = TRACKING(J1)
while True:
    if tracking.get_state() == 11:
        display.show(Image.YES)
    elif tracking.get_state() == 10:
        display.show(Image.SAD)
    elif tracking.get_state() == 00:
        display.show(Image.NO)
    elif tracking.get_state() == 01:
        display.show(Image.HAPPY)

20.8.4. Result¶