Name: Cloudera Edge2AI: MiNiFi Java Agent with Raspberry Pi and Thermal Camera and Air Quality Sensor - Part 1
Rating: 3.4 (9141 reviews)
Author: tspannhw

MiNiFi with Thermal Cameras and Air Quality Sensors

Cloudera Edge2AI: MiNiFi Java Agent with Raspberry Pi and Thermal Camera and Air Quality Sensor - Part 1

Use Case / Overview:

We need to track heat signatures, web camera images, gas and other readings from a remote workers office. This is for occupancy analytics and safety monitoring. We can extend this to field and remote sites where levels of temperatures, movements, noxious gases and other real world items may cause risk to our staff.

For tracking room temperature and humidity we have other sensors: https://www.datainmotion.dev/2019/12/iot-series-minifi-agent-on-raspberry-pi.html

https://www.datainmotion.dev/2019/10/using-grovepi-with-raspberry-pi-and.html

https://www.datainmotion.dev/2019/09/powering-edge-ai-for-sensor-reading.html

https://www.datainmotion.dev/2019/12/easy-deep-learning-in-apache-nifi-with.html

We can also track things like GPS, overhead plane traffic, regionalized social media reports, news, government reports, weather, mass transit status, traffic cameras, smoke, stock market, database, files, syslog, logs and anything else we may need to add to improve our machine learning and deep learning models.

We want to send immediate alerts if anything is dangerous to the equipment or living things in the area. We have deployed a pre-built TensorFlow Lite model to our edge device to execute on incoming images. We can deploy our own models automagically via Apache NiFi - MiNiFi Agents and Edge Flow Manager: https://www.datainmotion.dev/2019/08/updating-machine-learning-models-at.html.

Hardware Component List:

Raspberry Pi 4
USB Power Cable
Breakout Garden for Raspberry Pi (I2C + SPI)
SGP30 Air Quality Sensor Breakout
MLX90640 Thermal Camera Breakout – Wide angle (110°)

Software Component List:

Raspian
Python 3.7
OpenJDK 8 Java
Apache NiFi 1.10
MiniFi Agent 0.6.0 Java
Cloudera Edge Flow Manager (CEM)
Apache Kudu
Apache Kafka 2.x
Cloudera Streams Messaging Manager
Cloudera Manager 7.0.3
Apache Hue
Cloudera Schema Registry
Apache NiFi Registry
CDP on AWS with Kafka and NiFi Data Hub

Source Code:

https://github.com/tspannhw/minifi-gasthermal

https://github.com/tspannhw/minifi-breakoutgarden

https://github.com/tspannhw/table-ddl

Example JSON Data:

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px Menlo; color: #ffffff; background-color: #224fbc} span.s1 {font-variant-ligatures: no-common-ligatures}

{"uuid": "sgp30_uuid_qmy_20200104232746", "ipaddress": "192.168.1.221", "runtime": "0", "host": "garden2", "host_name": "garden2", "macaddress": "dc:a6:32:32:98:20", "end": "1578180466.510303", "te": "0.027782917022705078", "systemtime": "01/04/2020 18:27:46", "cpu": 3.9, "diskusage": "111786.0 MB", "memory": 9.7, "equivalentco2ppm": " 405", "totalvocppb": " 16", "id": "20200104232746_9379ae31-d848-4655-964f-92bd1b5e63fe"}

{ "node_id_0" : "511",

"label_0" : "container ship, containership, container vessel",

"result_0" : "0.439216",

"node_id_1" : "650",

"label_1" : "megalith, megalithic structure",

"result_1" : "0.050980",

"node_id_2" : "580",

"label_2" : "grand piano, grand",

"result_2" : "0.050980",

"node_id_3" : "882",

"label_3" : "upright, upright piano",

"result_3" : "0.027451",

"node_id_4" : "518",

"label_4" : "crane",

"result_4" : "0.023529",

"uuid" : "tensorflow_uuid_mbk_20200106194910",

"ipaddress" : "192.168.1.221",

"runtime" : "0",

"host" : "garden2",

"host_name" : "garden2",

"macaddress" : "dc:a6:32:32:98:20",

"end" : "1578340151.1180859",

"te" : "0.18831157684326172",

"systemtime" : "01/06/2020 14:49:11",

"cpu" : 45.8,

"diskusage" : "109621.5 MB",

"memory" : 50.2,

"id" : "20200106194910_098df463-4d9e-4326-9f8c-ad12fe55c7d2" }

Example Thermal Data:

Example Web Cam Data:

Device:

Setup:

We need to make sure the Raspberry Pi is up to date and has some software available such as git, curl and unzip. I can then build the MLX library.

I had to install the sgp30-python using the install.sh from the github, don't use the pip3 install. Initial calibration will take a while, so let that happen.

A demo is installed: /home/pi/Pimoroni/sgp30/examples

MLX Thermal Camera

There is a nice Python utility that will build a GIF animation from the camera. /opt/demo/mlx90640-library/python

Make sure you build all examples.

Install Java for MiNiFi Agent

sudo apt install openjdk-8-jdk openjdk-8-jre

Download MiNiFi from Cloudera or nifi.apache.org and copy zip/tar/gz to your device.

MiNiFi Ingest:

Web Camera Images

Sensor JSON Logs

Thermal Videos

TensorFlow Lite Classification Results

MiNiFi can grab my data from my device whether it's files, logs, images, sensor readings, python app calls, shell scripts, TCP, UDP or whatever. Goodbye cron.

Building a MiNiFi flow and pushing that to make MiNiFi agents running on various devices is a snap. I drag and drop a few components, set some parameters such which file to tail, what directory to list and what scripts to run and bam send it to the cloud.

It is very easy to monitor my progress with EFM event viewer or REST API.

NiFi Processing:

Receive From MiNiFi Agents
Route Images to Image Processing
QueryRecord to limit and route records
Push to Kafka

Additional NiFi Processing in Second AWS Cluster

Consume Kafka
Insert into Kudu Table

We need to add topics to Kafka so we can send our messages for further processing.

Before I can create Kafka topics, send messages or monitor Kafka, I need a Kafka cluster. Using The Enterprise Data Cloud, Cloudera Data Platform lets me easily spin up a Kafka cluster on AWS or Azure (soon Google).

If I don't like fancy web UIs or need to script this, there is a CDP CLI that I can create a cluster using a JSON template.

It is very easy to build NiFi and Kafka Data Hubs and make them available to users/developers in minutes. So we are now ready to rock.

Since we have been producing and consuming thousands of messages in different topics to my cloud hosted Kafka cluster, let's see what's going on by using Cloudera's Streams Messaging Manager (SMM).

Let's see the data now that it has landed in Impala/Kudu tables. So easy to query my tables with Apache Hue.

We can see the data displayed in Slack channels.

I can see my tables have been built in Kudu.

Cloud Storage - Kudu Tables:

CREATE TABLE webcam ( uuid STRING, end STRING, systemtime STRING, runtime STRING, cpu DOUBLE, id STRING, te STRING,

host STRING,

macaddress STRING, diskusage STRING, memory DOUBLE, ipaddress STRING, host_name STRING,

node_id_0 INT, label_0 STRING, result_0 DOUBLE,

node_id_1 INT, label_1 STRING, result_1 DOUBLE,

node_id_2 INT, label_2 STRING, result_2 DOUBLE,

node_id_3 INT, label_3 STRING, result_3 DOUBLE,

node_id_4 INT, label_4 STRING, result_4 DOUBLE,

PRIMARY KEY (uuid, end)

)

PARTITION BY HASH PARTITIONS 4

STORED AS KUDU

TBLPROPERTIES ('kudu.num_tablet_replicas' = '1');

CREATE TABLE gassensors ( uuid STRING, end STRING, systemtime STRING, runtime STRING, cpu DOUBLE, id STRING, te STRING,

host STRING, equivalentco2ppm STRING, totalvocppb STRING,

macaddress STRING, diskusage STRING, memory DOUBLE, ipaddress STRING, host_name STRING,

PRIMARY KEY (uuid, end)

)

PARTITION BY HASH PARTITIONS 4

STORED AS KUDU

TBLPROPERTIES ('kudu.num_tablet_replicas' = '1');

CREATE TABLE bme280sensors ( uuid STRING, end STRING, systemtime STRING, runtime STRING, cpu DOUBLE, id STRING,

te STRING,

host STRING,

macaddress STRING, diskusage STRING, memory DOUBLE, ipaddress STRING,

host_name STRING, bme280_altitude STRING, bme280_tempf STRING, max30105timestamp STRING,

max30105_detected STRING, max30105_delta STRING, max30105_temp STRING, bme280_tempc STRING,

max30105_mean STRING, max30105_value STRING, bme280_altitude_feet STRING, bme280_pressure STRING,

starttime STRING, cputemp DOUBLE, imgnamep STRING, imgname STRING,

PRIMARY KEY (uuid, end)

)

PARTITION BY HASH PARTITIONS 4

STORED AS KUDU

TBLPROPERTIES ('kudu.num_tablet_replicas' = '1');

Python Libraries:

wget https://dl.google.com/coral/python/tflite\_runtime-1.14.0-cp37-cp37m-linux\_armv7l.whl

pip3 install scikit-image

pip3 install getmac

pip3 install psutilpip3 install --upgrade pip

pip3 install --upgrade setuptools

pip3 install tflite_runtime-1.14.0-cp37-cp37m-linux_armv7l.whl

pip3 install easydict -U

pip3 install scikit-learn -U

pip3 install opencv-python -U --user

pip3 install numpy -U

pip3 install mxnet -U

pip3 install gluoncv --upgrade

pip3 install tensorflow

Summary:

We read thermal images, sensors and camera images with a MiNiFi agent that sends this data via MQTT and HTTP(S) Site-to-Site (S2S). We process MQTT, Kafka and S2S data streams with NiFi and easily push the final data into Kudu tables which we can query.

So we easily ingest structured, unstructured and semistructured data with live analytics.

In the second part of this article I will show you how we integrate with CDSW for additional machine learning on our data.

References

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