Pi4J + Amazon S3 REST API + Amazon Athena [P019]






https://www.youtube.com/watch?v=G-Ot7oh4_jk


GitHub : https://github.com/rdiot/rdiot-p019.git


* Parts

- Raspberry Pi2

Temperature and humidity DHT11 sensor module (KY-015) [S008]



* Contents

- Connect 

S - Signal GPIO3

middle - VCC

- - GND


1. Getting sensor value by Pi4J (Java I/O library for the Raspberry Pi) and then upload to amazon s3.

 : Run the java application

$ java -Dpi4j.linking=dynamic -jar pi4j_s3rest-0.0.1-SNAPSHOT.jar


2. Check the upload status in the amazon console. (s3)




3. Setup Amazon Athena .

- add database : pisensor

- add table : temperature


- DDL (add table)

CREATE EXTERNAL TABLE IF NOT EXISTS piSensor.temperature (

  `name` string,

  `value` float 

)

ROW FORMAT SERDE 'org.openx.data.jsonserde.JsonSerDe'

WITH SERDEPROPERTIES (

  'serialization.format' = '1'

) LOCATION 's3://rdkim-test/'

TBLPROPERTIES ('has_encrypted_data'='false');


4. SQL Query in the Amazon Athena

example : SELECT * FROM "pisensor"."temperature" limit 10;



- Pi4J Java Maven

<dependency>

    <groupId>com.pi4j</groupId>

    <artifactId>pi4j-core</artifactId>

   <version>1.1</version>

</dependency>


- project maven pom.xml 

 : https://github.com/rdiot/rdiot-p019/blob/master/pom.xml


- source : main : https://github.com/rdiot/rdiot-p019/blob/master/pi4j_s3rest/App.java

- source : pi4j : https://github.com/rdiot/rdiot-p019/blob/master/pi4j/dht11.java

- source : s3 rest api header aws sig4 : https://github.com/rdiot/rdiot-p019/blob/master/s3rest/auth/AWS4SignerForAuthorizationHeader.java


- Key Code

     dht11 dht = new dht11();

   

        for (int i=0; i<10; i++) {

            try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

            

            objectContent = dht.getTemperature();

            

            if(objectContent != null) {

        System.out.println(objectContent);

        putS3Object(bucketName, regionName, awsAccessKey, awsSecretKey);

            break;

            }            

         }     



- Reference

 : Pi4J Project : http://pi4j.com

 : Pi4J GitHub : https://github.com/Pi4J/pi4j

 : get dht11 : https://stackoverflow.com/questions/28486159/read-temperature-from-dht11-using-pi4j

 : Amazon S3 Rest API : https://docs.aws.amazon.com/AmazonS3/latest/API/Welcome.html


Posted by RD IoT RDIoT

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