The HC-SR505 Mini PIR Motion Sensor is based on infrared technology and it can automatic control by itself with high sensitivity and high reliability. Because of the minimum size and low-power operation mode, it widely used in various of automatic electronic equipment, especially battery-powered automatic products.
It works similar to the larger hc-sr501 which is commonly used in many projects
Very simple to use, the code below shows a simple sketch. As you can see it simply a case of reading the output and if it goes high then the PIR has detected something
Layout
Code
[codesyntax lang=”python”]
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
PIR_PIN = 21
GPIO.setup(PIR_PIN, GPIO.IN)
def MOTION(PIR_PIN):
print “Motion Detected!”
print “PIR Module Test (CTRL+C to exit)”
time.sleep(2)
print “Ready”
try:
GPIO.add_event_detect(PIR_PIN, GPIO.RISING, callback=MOTION)
while 1:
time.sleep(100)
except KeyboardInterrupt:
print ” Quit”
GPIO.cleanup()
[/codesyntax]
Output
Link
A low cost module this one, you can pick these up for about $2 a piece
HC-SR505 Mini Infrared PIR Motion Sensor Precise Infrared Detector Module
