Introduction: Build a Camera Alert Application With RaspberryPi 3 and IOS/Android Pushbullet App
In this tutorial, I am gonna show you how to build a simple application that detects motion and sends notification to the your smart phone using raspberry pi and camera module. If there are something or someone moving in the camera setup field, you will get notified to your phone or web browsers. The notification comes with text, still image, and video. that you can view it right on iOS or android.The application is pretty simple. It utilises the free software and services such as picamera, ffmpeg, and pushbullet. I will walk you through the architect, flow chart, and explain the main python functions. At the end of this video, you can build your own application or customize the already built one as you wish.
Step 1: Understand Spec
This section explains the specification of application including app structure, and general flow chart. You will have a clear vision about what application does.
There are 3 actors play together to build up the application. (1) RaspberryPi&Camera module as the data source that continuously scan for motion and recording video at the same time, (2) PushBullet as the message-broker to send messages(text, still image, and videos) back and forth between RaspberryPi and Mobile/Web, and (3) mobile/web acts as “notifyee” who receives the still image and video of motion. The communication is two ways though. It means you can send a command from mobile or web to Raspberry Pi for particular action such as “@snap” (for instantly take a photo) or “@check” (to get current system information of Pi).
General Flow Chart
When the script launch, it takes 2 seconds to warm up the camera to make sure everything works properly. Then jump right into motion scanning. If moving happens, The Pi will capture a still image and send notification to phone immediately. At the same time, Pi keeps recording the moment for a few more seconds. After that a mount of time, if moving is still there, Pi re-capture a new image and send a new notification. Until no motion anymore, the recorded videos will be pushed to mobile to confirm the motion end. The system goes into motion scanning state. The programe loops again and again as this flow.
Step 2: Setup Pushbullet
First, you need to register a pushbullet account get the key for notification. Goto https://www.pushbullet.com, you can either register with google email or facebook. In my case, I use gmail. After successful signup, Let login and goto Settings–> Account to create a API access token. We need this token for Raspberry Pi to push notification. Just note them down some where.
Second, on mobile, the bushbullet application is ready for both iOS and Android. So, install it. Make sure you login with the pushbullet account that you just registered.
Step 3: Download Software
I recommend you download and install the ready-to-work image in Resources section to save your ton of time for setup necessary software and libraries. Otherwise, you can setup from the brand-new Jessie. That’s fine.
This application builds on top of standard Raspbian Jessie released on 2017-04-10 that downloads from official website of raspberry pi. You also need ffmpeg for video convert from h264 to mp4 to view directly on your phone or web browser, and pushbullet python library for notification. One note for ffmpeg that it is not ready for install via “apt-get” command on Jessie, you have to compile it from source code. The compilation time takes about 3 hours. The source code of application is mostly written in Python. Now let download the ready-to-work image, this file size is huge, it’s about 2.7GB. So now should be the coffee time.
Step 4: Flash Image to Pi
Oh right, you have downloaded the image successfully, now let unzip and flash it to your SD card. I used the sandisk micro sd card 8GB. I’m using MAC. In case you don’t know how to flash image to SD card, check this tip. If you’re on windows, you can flash with WIN32DISKIMAGER. The flash takes about 20 minutes, coffee again. (make sure you don’t drink too much)
Step 5: Enter the Pushbullet Access Token
Now is show time, let take a look how it works. Insert the SD card, power Pi up. The application source code is placed right on the Desktop. You only job now is enter the pushbullet key as following:
$> cd ~/Desktop/PiCameraNotifier/
$> vi main.py
Save the main.py and reboot the pi. Enjoy the result!
Step 6: Play Around
Take a look at pushBullet application on your phone, you should see a message that tells The application is up running. The first message should be “PiCameraNotifier app starts!”. Right swipe that message to bring you to chat screen of PushBullet. Later on, all images, videos, and texts from RaspberryPi will be sent to this chat screen. Now let try moving something in front of camera to see the magic happens. Use QuickView on iOS to view motion video. Here is my example.
Step 7: Understand Under the Hood
To understand detail how the code work, Please check the full tutorial.
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