Overview

This is a sample for monitoring the field. By measuring Temperature, humidity, illuminance, the moisture, you can know the state of the field. In addition, regularly shoot the field, and upload images to S3 to the bucket.

Raspberry Pi

Installation

Setup AWS

S3

create 2 bucket

• bucket-images
• bucket-videos

ACCESS KEY

generate a new access key which have this policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "arn:aws:logs:*:*:*"
        },
        {
            "Sid": "Stmt1461402974000",
            "Effect": "Allow",
            "Action": [
                "s3:GetObject",
                "s3:GetObjectAcl",
                "s3:ListBucket",
                "s3:PutObject",
                "s3:PutObjectAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket-images",
                "arn:aws:s3:::bucket-images/*",
                "arn:aws:s3:::bucket-videos",
                "arn:aws:s3:::bucket-videos/*"
            ]
        }
    ]
}       

Lambda

Create a 2 lambda function.

• Runtime
• Python2.7
• source
• metric store function
  • https://github.com/sparkgene/iot\_farm\_monitoring/blob/master/lambda_function.py
• video converter function
  • https://github.com/sparkgene/lambda\_image\_to_video
  • scheduled to execute each hour

AWS IoT

AWS IoT Resource	key	value
Thing	name	pi_farm2
Policy	name	pi-farm2-policy
Rule	name	pi_farm2_rule
Rule	Query	SELECT * FROM 'pi_farm2/metrics'
Rule	Action	lambda (metric store function created at previous step)

Shadow state

{
  "desired": {
    "source_version": 1(set the version of https://github.com/sparkgene/iot\_farm_monitoring/blob/master/version)
  }
}

Policy Document

{
  "Statement": [
    {
      "Action": "iot:*",
      "Resource": "*",
      "Effect": "Allow"
    }
  ],
  "Version": "2012-10-17"
}

Setup Raspberry Pi

update package

sudo su
apt-get update
apt-get install build-essential python-dev git
npm install npm -g

install Adfruit DHT library

cd /opt/
git clone https://github.com/adafruit/Adafruit_Python_DHT.git
cd Adafruit_Python_DHT
python setup.py install

SORACOM Air script

cd /opt/
git clone https://gist.github.com/j3tm0t0/65367f971c3d770557f3 sora
mv /opt/sora/soracomair /etc/init.d/
chmod 755 /etc/init.d/soracomair

setup pi_farm

create directories

mkdir /opt/pi_farm
cd /opt/pi_farm
mkdir certs
mkdir -p data/metrics
mkdir -p data/photos
mkdir node_modules
mkdir release

clone pi_farm

cd /opt/pi_farm/release
git clone https://github.com/sparkgene/iot_farm_monitoring.git 0000

install AWS SDK

cd 0000
ln -s /opt/pi_farm/node_modules ./node_modules
npm install aws-iot-device-sdk

create environment_variables file

cp environment_variables.org environment_variables

set the variables

vi environment_variables

S3_BUCKET=<S3 bucket to upload pictures>
IOT_PRODUCT=pi_farm
IOT_CLIENT_ID=pi2
AWS_ACCESS_KEY=<ACCESS KEY>
AWS_SECRET_KEY=<SECRET KEY>
AWS_REGION=ap-northeast-1
GIT_REPO=https://github.com/sparkgene/iot_farm_monitoring.git

register crontab

crontab ./crontab