{"id":18,"date":"2012-10-22T06:16:05","date_gmt":"2012-10-22T06:16:05","guid":{"rendered":"http:\/\/www.millamilla.com\/?p=18"},"modified":"2012-10-22T06:16:05","modified_gmt":"2012-10-22T06:16:05","slug":"using-raspberry-pi-with-pir-motion-sensor","status":"publish","type":"post","link":"https:\/\/www.millamilla.com:443\/?p=18","title":{"rendered":"Using Raspberry Pi with PIR ( motion ) Sensor"},"content":{"rendered":"

I have been using the Arduino for a few years now and recently curiosity got the better of me with the excitement around the Raspberry Pi. I purchased my first Raspberry Pi and since my interest is more in line with interacting with the physical than just having a small computer, I needed a second project. Of course, the first project was to blink an LED!<\/p>\n

For my second project, I decided to expand on the first. I still use output to blink an LED, but now I also use input to decide when to blink the LED. The way this project works is by sensing motion using a PIR, Passive Infra-Red, sensor.<\/p>\n

Using the Adafruit Raspberry Pi Cobbler, here’s how I connected the Raspberry Pi GPIO pins to the breadboard and wired up the PIR sensor and LED<\/p>\n

\"\"<\/a><\/p>\n

Download<\/a>\u00a0the\u00a0Fritzing<\/a>\u00a0diagram. This requires the\u00a0Adafruit<\/a>Fritzing library.<\/p>\n

<\/h4>\n

Here’s the code<\/a>!<\/h4>\n
\r\nimport RPi.GPIO as GPIO\r\nimport time\r\n\r\nPIR = 23\r\nLED = 24\r\n\r\npirState = False                        # we start, assuming no motion detected\r\npirVal = False                          # we start, assuming no motion detected\r\n\r\nGPIO.setmode(GPIO.BCM)\r\nGPIO.setup(PIR, GPIO.IN)\r\nGPIO.setup(LED, GPIO.OUT)\r\n\r\nwhile True:\r\n    pirVal = GPIO.input(PIR)            # read input value\r\n    if (pirVal == True):                # check if the input is HIGH\r\n        GPIO.output(LED, True)          # turn LED ON\r\n        if (pirState == False):\r\n            # we have _just_ turned on\r\n            pirState = True\r\n    else:\r\n        GPIO.output(LED, False)         # turn LED OFF\r\n        if (pirState == True):\r\n            # we have _just_ turned off\r\n            time.sleep(2)\r\n            pirState = False;\r\n<\/pre>\n
Parts List \/ BOM (Bill of Materials) – Excluding Raspberry PI<\/h4>\n\n\n\n\n\n\n\n\n\n\n
Part<\/th>\nSource<\/th>\nImage<\/th>\nApprox Price<\/th>\n<\/tr>\n
1\/2 Size breadboard<\/td>\nAdafruit<\/a><\/td>\n\"\"<\/td>\n$5.00<\/td>\n<\/tr>\n
Pi Cobbler Breakout Kit for Raspberry Pi<\/td>\nAdafruit<\/a><\/td>\n\"\"<\/td>\n$7.95<\/td>\n<\/tr>\n
PIR (motion) sensor<\/td>\nAdafruit<\/a><\/td>\n\"\"<\/td>\n$10.00<\/td>\n<\/tr>\n
220 ohm resistor<\/td>\nRadioShack<\/a><\/td>\n\"\"<\/td>\n$1.19<\/td>\n<\/tr>\n
Green LED<\/td>\nRadioShack<\/a><\/td>\n\"\"<\/td>\n$1.69<\/td>\n<\/tr>\n
Breadboarding Wire<\/td>\nAdafruit<\/a><\/td>\n\"\"<\/td>\n$6.00<\/td>\n<\/tr>\n
<\/td>\n<\/td>\nTotal<\/td>\n$31.83*<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
* = Prices are the best information from the time this tutorial was written. Prices do not include
\nshipping.<\/p>\n","protected":false},"excerpt":{"rendered":"
I have been using the Arduino for a few years now and recently curiosity got the better of me with the excitement around the Raspberry Pi. I purchased my first Raspberry Pi and since my interest is more in line with interacting with the physical than just having a small computer, I needed a second […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-18","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=\/wp\/v2\/posts\/18","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=18"}],"version-history":[{"count":41,"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=\/wp\/v2\/posts\/18\/revisions"}],"predecessor-version":[{"id":64,"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=\/wp\/v2\/posts\/18\/revisions\/64"}],"wp:attachment":[{"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.millamilla.com:443\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}