Eagle EYE

In this project, the PIR sensor detects the motion and updates the time and duration of motion to the user. This software is a command-line interface.

Hardware Used

• Raspberry Pi 4 Computer
• PIR sensor
• LED
• Push-button
• Resistor (330 ohms)

Software Tools Used

• Putty
• VNC viewer
• Thony IDE

Hardware Description

PIR sensor is powered from an external 9V battery and the RPi is powered from the laptop. PIR output is connected to the GPIO 24 of the RPi and the Pushbutton is connected to the GPIO 23 of the RPi in the PULL UP DOWN configuration and an LED is connected in parallel to the output of the Sensor through the resistor.

Wiring Diagram

Software Description

RPi is connected remotely using SSH from the laptop to know the IP address and conned to the RPi using VNC viewer. In RPi the python file is executed from the Terminal.

Python Script

import RPi.GPIO as io
from datetime import datetime as dt
from time import sleep as s
import time
io.setmode(io.BCM)
io.setup(23, io.IN, pull_up_down = io.PUD_UP)
io.setup(24, io.IN)
start = 0.01
end = 2
lap = 0
print("-"*50)
print("### press the start button to start monitoring ###")
print("-"*50)
i=0
while(True):
    while(io.input(23) == 0):
        s(0.01)
        lap = lap + 0.01
        if(lap == 0.01):
            print("### Observation Started ###")
            break            
        if(lap > end):break
    if(lap > start and lap < end):
        if(io.input(24)):
            date = dt.now()
            start_time = time.time()
            while(io.input(24)):continue
            end_time = time.time() - start_time
            if(end_time > 0.5):
                print("{0}. ## Object Detected ## Date : {1}; Duration : {2}".format(i+1,date,end_time))
                i+=1
    if(lap>end):
        print("### Observation Stopped ###")
        break

Usage

When the Python file is executed the software waits for the user to press the push button. when the push button is pressed for at least 100ms the software starts reading the data from the sensor. The software prints the details (like Date, Time, Duration) of the detected motion into the terminal. When the pushbutton is pressed for a long time (at least for 2 seconds), the execution stops. If you want to run the Software again you need to execute the python file again.

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