2.9 Lucky CatΒΆ

In this project, we use pir and servo to make a lucky cat. The PIR Module is used to detect the visitors and servo is used to imitate the beckoning motion of the lucky cat.

Wiring

lucky_cat0

  • The orange wire (signal) of the servo is connected to GP15, the red wire (power) is connected to VBUS, and the brown wire (ground) is connected to GND.

  • The middle pin of the PIR module is connected to the GP3.

Code

Note

  • You can refer to the image below to write code by dragging and dropping.

  • Import 2.9_lucky_cat.png from the path of kepler-kit-main\piper. For detailed tutorials, please refer to Import the Code.

lucky_cat

  • After connecting Pico W, click the Start button and the code starts to run.

  • When the PIR module detects a customer arrival, the servo oscillates back and forth five times and then stops.

How it Works?

lucky_cat1

Set the rotation speed of pin15 (servo) to 15%.

lucky_cat2

If GP14 is low, set the variable [prestate] to 0. When the variable [prestate] is 0 and GP14 is high (human detected), set the variable [prestate] to 1.

The purpose of this is to make the main code work only when the GP14 changes from low to high, and to respond only once if the PIR module keeps detecting people.

lucky_cat3

Make the servo cycle 5 times from 0 to 180 degrees rotation.

  • [repeat () times do]: Loop through the code inside the do block a finite number of times.