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Overview

This project is to build a simple motion detection gadget that can describe the motion as it is detected by the camera

Setup

OS on RaspberryPi

cat /etc/os-release

Raspian on raspberry pi

PRETTY_NAME = "Raspian GNU/Linux 10 (buster)

VERSION="10(buster)"

ID =raspian

ID_LIKE=debian

Update RaspberryPi

sudo apt-get update
sudo apt full-upgrade

Projects

The whole solution includes the following: configurations on RaspberryPi and DoorBell.sln that includes following projects:

  1. DoorBell.AzureFunction
  2. DoorBell.DataContracts
  3. DoorBell.Storage
  4. DoorBell.Web

1. Configuration on RaspberryPi

  1. On RaspberryPi, motion library is used to capture and record motion. The updated motion.conf file is included in the repo
  2. A custom python (uploadFile.py) file is added to RaspberryPi. This file connects with the IotHub. Once the motion library saves the motion as .mp4 file, it executes the uploadFile.py. This file extracts frames from the .mp4 file, uploads the frames and the original mp4 file to a blob storage using the IoTHub's file upload mechanism and then sends a message to the IotHub that a new event happened including the details.

2. DoorBell.AzureFunction

The azure function gets triggered everytime the IotHub receives a message. The function does the following:

  1. For each frame (jpg) file stored (by the RaspberryPi), calls Azure Computer Vision sdk to get different vision features (including the captions) for that image.
  2. Store the details received from the Azure Computer Vision service along with the message in the Cosmos DB.

3. DoorBell.DataContracts

This is data contracts library that is used across the projects.

4. DoorBell.Storage

This is a web api that wraps around the CosmosDB to save and fetch device messages along with the processed information received from the Azure Computer Vision service.

5. DoorBell.Web

This is a webApp that shows the events, captions (description) received from Azure Computer Vision services along with the original video (mp4) file recorded by the RaspberryPi

Project setup on RaspberryPi

use pip3 to use python 3

use --user option when installing python libraries in the user's python install directory

From the project repo run pip3 install to install all the required packages

pip3 install -r requirements.txt --user

Setup azure credentials for keyvault.

login to shell.azure.com/bash

az ad sp create-for-rbac --name http://my-application --skip-assignment
export AZURE_CLIENT_ID="generated app id"
export AZURE_CLIENT_SECRET="random password"
export AZURE_TENANT_ID="tenant id"

Authorize the service principal to perform key operations in your Key Vault:

az keyvault set-policy --name my-key-vault --spn $AZURE_CLIENT_ID --secret-permissions get set list

References

  1. RaspberryPi docs: https://www.raspberrypi.org/documentation/raspbian/
  2. Motion library on RaspberryPi (version 4.1.1):https://motion-project.github.io/4.1.1/motion_guide.html
  3. Azure IotHub Python samples: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-python-python-file-upload
  4. CosmosDb Samples: https://docs.microsoft.com/en-us/azure/cosmos-db/sql-api-dotnet-v3sdk-samples
  5. Azure Functions: https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-iot

Note:

Sorry, the code repo is still kept private :)

Architecture Design and Data Flow

The screenshot below has the high level architecture design and how the data flows thru the system Alt text

The output

Here is a screenshot from the DoorBell.Web app of the results: Events List:

Alt text

Event Description with original video:

Alt text