Basic tutorial of how to setup a SW-420 Vibration sensor with the Raspberry Pi.
PARTS:
RPI 3 – https://amzn.to/2VA9pQY
4 Amp Power Adapter – https://amzn.to/2CTptWu
16GB micro SD – https://amzn.to/2SFMwd3
120 pcs jumper cable: https://ebay.to/2VAb9cY
Vibration Sensors: https://amzn.to/2AzL0lC
SCHEMATIC:

CODE:
#!/usr/bin/python
import RPi.GPIO as GPIO
import time
#GPIO SETUP
channel = 17
GPIO.setmode(GPIO.BCM)
GPIO.setup(channel, GPIO.IN)
def callback(channel):
if GPIO.input(channel):
print "Movement Detected!"
else:
print "Movement Detected!"
GPIO.add_event_detect(channel, GPIO.BOTH, bouncetime=300) # let us know when the pin goes HIGH or LOW
GPIO.add_event_callback(channel, callback) # assign function to GPIO PIN, Run function on change
# infinite loop
while True:
time.sleep(1)