2. Case 21: Color Recognition with TPBot

2.1. Purpose

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• Using Smart AI Lens to recognize the color and display it on the head lights of TPBot.

2.2. Materials required

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• 1 x TPBot

• 1 x AI Lens

2.3. Hardware Connections

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Connect the AI Lens to the IIC port on TPBot.

2.4. Software

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MicroSoft MakeCode

2.5. MakeCode Programming

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

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

• We need to add a package for programming the AI Lens kit. Click “Extensions” in the bottom of the drawer and seach with https://github.com/elecfreaks/pxt-PlanetX-AI in the dialogue box to download it.

Sample Code

• Initialize the AI lens kit in the On start brick and switch its function to color recognition, then show an icon.

• In forever brick, get an image from the AI lens and adjust TPBot’s headlights’ color by the color recognized in the lens.

• Complete Code:

Reference

• Link: https://makecode.microbit.org/_aAsAR1Tfj8kk

• You may also download it directly below:

2.6. Python Programming

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Add TPBot extension: https://www.elecfreaks.com/learn-cn/microbitKit/TPbot_tianpeng/TPbot-python.html

Add AI Lens extension: https://www.elecfreaks.com/learn-cn/microbitplanetX/ai/Plant-X-EF05035-python.html

Code

from microbit import *
from AILens import *
from TPBot import *

tp = TPBOT()
ai = AILENS()
# Set the function of AI Lens in color recognition
ai.switch_function(Color)
tp.set_motors_speed(40,40)
while True:
    #  Get an image
    ai.get_image()
    if (ai.get_color_type() == "Blue"):
        tp.set_car_light(0, 0, 255)
        tp.set_car_light(0, 0, 255)
    if (ai.get_color_type() == "Red"):
        tp.set_car_light(255, 0, 0)
        tp.set_car_light(255, 0, 0)
    if (ai.get_color_type() == "Green"):
        tp.set_car_light(0, 255, 0)
        tp.set_car_light(0, 255, 0)
    if (ai.get_color_type() == "Yellow"):
        tp.set_car_light(255, 255, 0)
        tp.set_car_light(255, 255, 0)     

Result

The TPBot drives forward, If the blue card is recognized, the TPBot lights on in blue; If the red card is recognized, the TPBot lights on in red; If the green card is recognized, the TPBot lights on in green; If the yellow card is recognized, the TPBot lights on in yellow.

2.7. Exploration

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2.8. FAQ

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Q: TPBot doesn’t work with the sample code.
A: It is probably due to the lack of battery power, please try adding the speed of the TPBot or replacing with new batteries.
Q: The AI Lens is not working, and it does not go to the function page with the sample code.
A: Please try replacing with new batteries.

2.9. Relevant File

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