SunFounder Thales Kit, Manual

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SunFounder Thales Kit for Raspberry Pi Pico, Release 1.0
3.4.7 Intruder Alarm
In the previous chapters, we used simple electronic components (such as LED, button). This time we will use the
sensor module - PIR.
Passive infrared sensor (PIR sensor) is a common sensor that can measure infrared (IR) light emitted by objects in its
field of view. Simply put, it will receive infrared radiation emitted from the body, thereby detecting the movement of
people and other animals. More specifically, it tells the main control board that someone has entered your room.
PIR Motion Sensor
Now, let’s use PIR and active buzzer to build an Intruder Alarm.
Wiring
Two types of buzzers are included in the kit. We need to use active buzzer. Turn them around, the sealed back (not the
exposed PCB) is the one we want.
The buzzer needs to use a transistor when working, here we use S8050.
72 Chapter 3. For MicroPython User