3. PIR Sensor¶
PIR Sensor is a type of electronic building block based on AM412 pyroelectric digital smart sensor. It can be used in sensing and detection of human or animal motion, sensing distance is about 4-5 meters.
Designed in RJ11 connections, easy to plug.
|Type of Connection||Digital Output|
|Size||55.8 x 23.8 mm|
3.5. Quick to Start¶
Materials Required and Diagram¶
Connect the PIR sensor to J1 port and the LED to J2 port in the Nezha expansion board as the picture shows.
3.6. MakeCode Programming¶
Click “Advanced” in the MakeCode drawer to see more choices.
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.
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.
Code as below:¶
The LED lights on while the motion being detected by the PIR sensor or the LED lights off.
3.7. Python Programming¶
Download the package and unzip it: PlanetX_MicroPython
Go to Python editor
We need to add enum.py and pir.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add enum.py and pir.py from the unzipped package of PlanetX_MicroPython.
from microbit import * from enum import * from pir import * while True: pir = PIR(J1) pir_value = pir.PIR_is_decection() if(pir_value == True): display.show(Image.HAPPY) else: display.show(Image.SAD)
A smile face displays on the micro:bit while the motion being detected by the PIR sensor or the micro:bit displays a sad face.