Project 3: PIR Motion Sensor

Description

The PIR motion sensor has many application scenarios in daily life, such as automatic induction lamp of stairs, automatic induction faucet of washbasin, etc.

It is also a digital sensor like buttons, which has two state values 0 or 1. And it will be sensed when people are moving.

Control Pin

PIR motion sensor	14
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Project 3.1 Read the PIR Motion Sensor

We will print out the value of the PIR motion sensor through the serial monitor.

Test Code

from machine import Pin
import time

PIR = Pin(14, Pin.IN)
while True:
    value = PIR.value()
    print(value, end = " ")
    if value == 1:
        print("Some body is in this area!")
    else:
        print("No one!")
    time.sleep(0.1)

Test Result

When you stand still in front of the sensor, the reading value is 0, move a little, it will change to 1.

Project 3.2 PIR Motion Sensor

If someone moves in front of the sensor, the LED will light up.

Test Code

from machine import Pin
import time

PIR = Pin(14, Pin.IN)
led = Pin(12, Pin.OUT)

while True:
    value = PIR.value()
    print(value)
    if value == 1:
        led.value(1)# turn on led
    else:
        led.value(0)
    time.sleep(0.1)

Test Result

Move your hand in front of the sensor, the LED will turn on. After a few seconds of immobility, the LED will turn off.