{"id":2059,"date":"2014-04-22T08:54:28","date_gmt":"2014-04-22T07:54:28","guid":{"rendered":"http:\/\/mccltd.net\/blog\/?p=2059"},"modified":"2015-03-06T10:57:56","modified_gmt":"2015-03-06T10:57:56","slug":"fudge-cam-python-code","status":"publish","type":"post","link":"http:\/\/darenmatthews.com\/blog\/?p=2059","title":{"rendered":"Fudge Cam – Python Code"},"content":{"rendered":"

This project achieves many objectives. It gives me a chance to learn how to use Python to control external devices (in this case a very cheap motion detecting sensor) and it also makes my girlfriend happy. Even though she does (rightly as there is a time and a place..!) complain about my “enthusiasm” for getting a pin to connect to a software interrupt. Anyway. Here it is:<\/p>\n

\"fudge\"<\/a>Capturing the antics of Fudgie the Hamster!<\/h5>\n

Detects motion using a PIR Motion Detection GPIO sensing kit to leverage the GPIO pins on the Raspberry Pi, then takes photos using the Raspberry Pi Camera Module and updates Twitter with a random rant from Fudgie himself.<\/p>\n

You will need to install “python-picamera”, which is a pure Python interface to the Raspberry Pi camera module for Python 2.7 (or above) or Python 3.2 (or above). The python-picamera library is available in the Raspbian archives. Install with apt:<\/p>\n

sudo apt-get update\r\nsudo apt-get install python-picamera<\/pre>\n
Alternatively, the Python3 package is installed with sudo apt-get install python3-picamera. An offline version of the documentation is available with<\/p>\n
sudo apt-get install python-picamera-docs.<\/pre>\n
Note:<\/b> Fudge Cam will soon be expanded to record video using Python. This can be displayed on a webpage:<\/p>\n
camera.start_recording('video.h264')\r\nsleep(5)\r\ncamera.stop_recording()<\/pre>\n
Meanwhile here is the current code:<\/p>\n
import RPi.GPIO as GPIO\r\nimport random, time, os\r\nimport tweepy\r\nimport picamera\r\n\r\npir = 17\r\nGPIO.setmode(GPIO.BCM)\r\nGPIO.setup(pir, GPIO.IN)\r\n\r\n### TWITTER SETTINGS ###\r\n# Set access keys via https:\/\/apps.twitter.com\r\napi_key = 'your_api_key_number'\r\napi_secret = 'your_api_secret_number'\r\naccess_token = 'your_access_token_number'\r\ntoken_secret = 'your_token_secret_number'\r\nauth = tweepy.OAuthHandler(api_key, api_secret)\r\nauth.set_access_token(access_token, token_secret)\r\napi = tweepy.API(auth)\r\nmy_twitter = api.me()\r\nprint my_twitter.name, \"is connected! Press CTRL + C to quit.\"\r\n# Three statuses. We'll pick one at random to go with our pic\r\ntweet_text = ['Aargh! I cannot sleep because I am nocturnal!',\r\n'This'll teach her! I wanted Sunflower seeds for dinner!!',\r\n'Let's party! I am drunk on fermented apples!']\r\n\r\n### CAMERA SETTINGS ###\r\ncamera = PiCamera()\r\ncam_res = (1024, 768)\r\ncamera.led = False # Turn off LED so we don't scare Fudge!\r\npics_taken = 0\r\ntime.sleep(1)\r\n\r\n### MAIN FUNCTIONS ###\r\ndef motion_sense(pir):\r\nprint \"Fudge action! Motion detected... Taking picture!\"\r\ntake_picture(cam_res)\r\n\r\ndef take_picture(resolution):\r\n  global pics_taken\r\n    camera.resolution = resolution\r\n    # Capture a sequence of frames\r\n    camera.capture(os.path.join(\r\n      'pics', 'image_' + str(pics_taken) + '.jpg'))\r\n    pics_taken += 1\r\n    print \"Gotcha! Picture taken! Tweeting it now...\"\"\"\r\n    update_twitter()\r\ndef update_twitter():\r\n  api.update_with_media(os.path.join(\r\n    'pics', 'image_' + str(pics_taken -1) + '.jpg'),\r\n    status = random.choice(tweet_text))\r\n  print \"Status updated!\"\r\n  #We don't want to tweet more than once per minute!\r\n  time.sleep(60)\r\n\r\n### MAIN PROGRAM LOOP ###\r\ntry:\r\n  GPIO.add_event_detect(pir, GPIO.RISING, callback=motion_sense)\r\n  while True:\r\n    time.sleep(60)\r\nexcept KeyboardInterrupt:\r\n  print \"\\nQuitting\"\r\nfinally:\r\n  camera.close()\r\n  GPIO.cleanup()<\/pre>\n