Passive Infrared Sensor

Description

A PIR Sensor can detect motion, it is also called motion sensor. It detect moveing people or animals. PIR stands for passive infrared. Here we use the SR602.

It has 3 connectors:

• - connected to GND
• + connected to 3.3V
• Out - digital output is 1 if motion is detected

This one is the HC-SR501 sensor and it should be connected to 5V, GND and a digital Pin.

How to connect it electrically

How to control it in MicroPython

Reading the value and printing it to the console

 1 #Example usage for ESP32
 2 from machine import Pin
 3 from time import sleep
 4 # digital input on pin 26
 5 pir = Pin(26, Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor
 6 
 7 while True:
 8   pirVal = pir.value()
 9   print(pirVal)
10   sleep(1)