node accelerometer python

A proof of concept to demostrate any measure captured from a accelerometer attached to a raspberry pi 3 and transport this information throw mqtt protocol to a hub server thats centralize this information using a mqtt message broker like mosca and message router like node-red to parse and manage.

The Node-RED flow Designer

The Dashboard UI with node-red-contrib-graph node-red module

The Raspberry pi 3 and accelerometer connected

Architecture

Hardware:

• Raspberry pi 3: The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation.
• Microstack™ Baseboard For Raspberry Pi®: Microstack™ Baseboard brings the exciting range of Microstack™ modules to Raspberry Pi®.
• Microstack™ Accelerometer: Find out which way is up! Detect taps, flicks, swishes and shakes, make a 3D motion controller or discover how much force has been applied.

Infraestructure Techonologies on server

• Raspbian: Last raspbian for raspberry pi. Raspbian is the Foundation’s official supported operating system.
• NodeJS: Event-driven I/O server-side JavaScript environment based on V8. Includes API documentation, change-log, examples and announcements.
• mosca: MQTT broker as a module http://mosca.io.
• Node-Red: A visual tool for wiring the Internet of Things.

Infraestructure Techonologies on device

• python3-microstacknode: Python modules for interacting with Microstack node components (accelerometer, GPS, etc).
• paho-mqtt: a python client for the MQTT protocol is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol.
• scipy: Fundamental library for scientific computing.
• pandas: pandas is an open source, BSD-licensed library providing high-performance, easy-to-use data structures and data analysis tools for the Python programming language.
• numpy: NumPy is the fundamental package for scientific computing with Python. It contains among other things.
• matplotlib: matplotlib is a python 2D plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms.

Frontend Techonologies on server

• node-red-contrib-graphs: A Node-RED graphing package.
• node-red-contrib-ui: UI nodes for node-red.

Installation:

Install mqtt python 3 module and microstack shield python 3 modules on raspberry-pi 3:

  sudo apt-get install python3-microstacknode
  sudo apt-get install python3-pip
  sudo pip3 install paho-mqtt
  sudo pip3 install pandas
  sudo pip3 install matplotlib
  
  # install scipy. Before install dependencies for scipy compilation, uncomment in /etc/apt/sources.list the devel repositories
  sudo apt-get update
  sudo apt-get build-dep python3-scipy

Install mosca mqtt message broker on the server:

  npm install mosca bunyan -g
  mosca -v | bunyan

Execute npm to install node-red message router and the UI modules on the server, the package.json has all dependencies:

  npm install

Start node-red

  node node_modules/node-red/red.js

Access Node-Red Web designer

  http://localhost:1880

Copy and import this flow from node-red import clipboard

[{"id":"3111afea.fdc34","type":"mqtt-broker","z":"66a7a68a.89d808","broker":"127.0.0.1","port":"1883","clientid":"","usetls":false,"verifyservercert":true,"compatmode":true,"keepalive":"60","cleansession":true,"willTopic":"","willQos":"0","willRetain":null,"willPayload":"","birthTopic":"","birthQos":"0","birthRetain":null,"birthPayload":""},{"id":"9186d7c4.d09e18","type":"mqtt in","z":"66a7a68a.89d808","name":"Accelerometer Mqtt","topic":"sensor/accelerometer","broker":"3111afea.fdc34","x":128.5,"y":214,"wires":[["ff33dc25.99f42","45db47ad.89b3f8","d6479b56.8174a8","b5f5e26e.76afc"]]},{"id":"b5f5e26e.76afc","type":"debug","z":"66a7a68a.89d808","name":"","active":true,"console":"false","complete":"payload","x":384.5,"y":73,"wires":[]},{"id":"ff33dc25.99f42","type":"function","z":"66a7a68a.89d808","name":"Acceleration","func":"var measure = JSON.parse(msg.payload);\n\nmsg.payload = {'A': measure.A,\n               'tstamp': measure.tstamp};\n\nreturn msg;","outputs":1,"noerr":0,"x":377,"y":171,"wires":[["a05b625c.5decb"]]},{"id":"a05b625c.5decb","type":"iot-datasource","z":"66a7a68a.89d808","name":"Acceleration","tstampField":"tstamp","dataField":"A","disableDiscover":false,"x":573,"y":171,"wires":[[]]},{"id":"45db47ad.89b3f8","type":"function","z":"66a7a68a.89d808","name":"Velocity","func":"var measure = JSON.parse(msg.payload);\n\nmsg.payload = {'V': measure.V,\n               'tstamp': measure.tstamp};\n\nreturn msg;","outputs":1,"noerr":0,"x":369,"y":253,"wires":[["e0a9f0d5.f4a37"]]},{"id":"d6479b56.8174a8","type":"function","z":"66a7a68a.89d808","name":"Position","func":"var measure = JSON.parse(msg.payload);\n\nmsg.payload = {'D': measure.D,\n               'tstamp': measure.tstamp};\n\nreturn msg;","outputs":1,"noerr":0,"x":369,"y":337,"wires":[["81319b06.9cc8e8"]]},{"id":"e0a9f0d5.f4a37","type":"iot-datasource","z":"66a7a68a.89d808","name":"Velocity","tstampField":"tstamp","dataField":"V","disableDiscover":false,"x":562,"y":253,"wires":[[]]},{"id":"81319b06.9cc8e8","type":"iot-datasource","z":"66a7a68a.89d808","name":"Position","tstampField":"tstamp","dataField":"D","disableDiscover":false,"x":563,"y":337,"wires":[[]]}]

Access Node-Red Web Dashboard

  http://localhost:1880/dash

Licenses

The source code is released under Apache 2.0.