22.4. Case 23: Face-tracking with TPBot¶
Build a face-tracking TPBot with the Smart AI Lens.
Connect the AI Lens to the IIC port on TPBot.
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-AIin the dialogue box to download it.
Initialize the AI lens kit in the On start brick and switch its function to face recognition.
In forever brick, get an image from the AI lens and adjust TPBot’ direction by the face recognized in the lens.
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
# Add your Python code here. E.g. from microbit import * from AILens import * from TPBot import * tp = TPBOT() ai = AILENS() # Set the function of AI Lens in face recognition ai.switch_function(Face) while True: # Get an image ai.get_image() buff = ai.get_face_data() # "buff"means the X coordinates data of the face detected in AI lens i = buff if ( i < 80): tp.set_motors_speed(-30,0) elif ( i > 144): tp.set_motors_speed(0,-30) else: tp.set_motors_speed(0,0)
The TPBot changes its heading direction in accordance with the face the AI Lens detects.
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.