Overview
This project introduces how to design a body motion detective security system with raspberry pi. The Experimental principle of this project is that, when the detection of the body motion, Raspberry Pi GPIO output get high level voltage and buzzer sound.
Experimental photo
Experimental Parts
Circuit Graph
Note: Please note that reversing +/- or incorrectly connecting can destroy your raspberry Pi. The buzzer you get may have different solder pin as the following graph, please prevail in kind.
Motion Sensor Schematic
Motion sensor Interface Layout
The two potentiometer can adjust delay time and sensitivity, as the follow picture:
Software
1) Enter the following command to compile the code, and press “enter” to complete compiling code:
sudo wget --no-check-certificate http://osoyoo.com/driver/motionsensor-test.py
You could modify the code throught the following ways.
enter the following command to create a new file named motionsensor-test.py and save this file at direction: /home/pi, and then press enter
sudo nano motionsensor-test.py
the downloaded code are actually as following:
import RPi.GPIO as GPIO
import time
M_pin = 18 #select the pin for motionsensor
B_pin = 26 #select the pin for buzzer
def init():
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(M_pin,GPIO.IN)
GPIO.setup(B_pin,GPIO.OUT)
pass
def buzzer():
while GPIO.input(M_pin):
GPIO.output(B_pin,GPIO.LOW)
time.sleep(0.5)
GPIO.output(B_pin,GPIO.HIGH)
time.sleep(0.5)
def detect():
for i in range(101):
if GPIO.input(M_pin):
print "Someone is closing!"
buzzer()
else:
GPIO.output(B_pin,GPIO.HIGH)
print "Nobody!"
time.sleep(2)
time.sleep(5)
init()
detect()
GPIO.cleanup()
Experiment Result:
Enter the following command to run python program, and press “enter” to run the project. When detection body motion, you will hear buzzer sound, and the monitor shows as the photo:
sudo python ./motionsensor-test.py
