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title	Goal

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In this tutorial you learn how to :

Create a model or a Digital twin of your equipment sensors.
Create organs that simulate your sensors behavior.
Launch your organs with efficiently

System architecture:

Panel

title	Requirements

For this tutorial, you just need the basic requirements

Panel

title	Create the models / Digital twins

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In this part you’re going to create two sensor models:

Sensor, a model with 4 attributes:
- id : unique intinteger
- name : string
- hydrometry : integer
- temperature : integer
SensorList, a model with 1 attribute:
- sensors : array of sensors

Create your spinal system and digital twin by following these steps:

Create a new spinal-system from the browser-admin template like it’s explained in the in the section "Creating a new Spinal System" in the Getting Started tutorial.
Create a folder called spinal-models to store the different models. Within this folder create a file named models.js.
Complete model.js:

Create the sensor model.
Extend the sensor model with the Model class from spinalCore.
Export the sensor model.
Create the sensor list.
Extend the sensor list with the Model of spinalCore.
Export the sensor list.

Your model file should look like this:

spinal-models/model.js

Code Block

language	js
theme	DJango
title	models.js
linenumbers	true

// SensorModel inherits from Model
class SensorModel extends Model {
  constructor() {
    super();
    // add attributes to the model
    this.add_attr({
      id: 0,
      name: "",
      hydrometry: 0,
      temperature: 0
    });
  }
}
module.exports.SensorModel = SensorModel;

// SensorListModel inherits from Model
class SensorListModel extends Model {
  constructor() {
    super();
    // Array of equipments
    this.add_attr({
      sensors: []
    });
  }
}
module.exports.SensorListModel = SensorListModel;

Panel

title	Instantiate a list of 2 Sensors

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In this part your are going to instantiate a list of 2 sensors digital twin in the hub database and create two "organs" of the system that will simulate the sensor behavior.

Each organ will simulate changes of hydrometry and temperature.

Create a new folder spinal-organ-sensor1 and within it a file named index.js.
in the index.js file:
1. Require spinal-core.
2. Get the connection parameter from the config.js file in the main folder
3. Create a function addItem. This function create, set and add an item to the list given in argument.
4. Create a function simulate. This function simulate the value of the sensor.
5. Create a function onSuccess. This function will be executed if the loading of ‘List’ is successful.
6. Create a function onFaill. This function will be executed if the loading of ‘List’ fail.
7. Load list from spinal-core.
Create a new folder spinal-organ-sensor2
Copy paste the index.js into sensor2 folder and do the appropriate modifications.

Panel

title	Note

If you have and API to retrieve the real data of your sensor use it to send real data to the graph.
You can run every sensor independently by running the corresponding index.js (node index.js)

Your file sensor1/index.js should look like this.

Code Block

language	js
theme	DJango
title	spinal-organ-sensor1/index.js
linenumbers	true

// Requirements and connection
const spinalCore = require('spinal-core-connectorjs');
const models = require('../spinal-models/models.js');

console.log("Configuration Environment not found, using default config");
process.env.SPINALHUB_PORT = 7777;
process.env.SPINALHUB_IP = "127.0.0.1";
process.env.SPINAL_USER_ID = 168;
process.env.SPINAL_PASSWORD = "JHGgcz45JKilmzknzelf65ddDadggftIO98P";

const conn = spinalCore.connect(`http://${process.env.SPINAL_USER_ID}:${process.env.SPINAL_PASSWORD}@${process.env.SPINALHUB_IP}:${process.env.SPINALHUB_PORT}/`);

// Gives random values to the hydrometry and temperature of a sensor
function simulate(sensor) {
  const hydro = Math.floor(Math.random() * 100);
  const degrees = Math.floor(Math.random() * 30);
  sensor.hydrometry.set(hydro);
  sensor.temperature.set(degrees);
  // Repeats every second
  setTimeout(() => {
    console.log(sensor.name.get() + ": data has changed");
    simulate(sensor);
  }, 1000);
};

// Finds a Sensor in the SensorList, if it doesn't exist, creates it
function getSensorById(list, id) {
  let item;

  for (let i = 0; i < list.sensors.length; i++) {
    if (list.sensors[i].id.get() === id) {
      item = list.sensors[i];
      break;
    }
  }
  if (typeof item === "undefined") {
    item = new models.SensorModel();
    item.id.set(id);
    item.name.set("sensor" + id);
    list.sensors.push(item);
  }
  return item;
}

// This function will be called if the list is successfully loaded
function onSuccess(list) {
  simulate(getSensorById(list, 0));
};

// This function will be called if the list cannot be loaded
function onFailure() {
  const list = new models.SensorListModel();
  const item = getSensorById(list, 0);

  spinalCore.store(conn, list, "List", () => {
    simulate(item);
  });
};

spinalCore.load(conn, "List", onSuccess, onFailure);

Run sensor1 Run spinal-organ-sensor1/index.js and go to the admin UI and put 'List' into the inspector and you should see the hydrometry and temperature of sensor0 change every second.

Your file sensor2/index.js should look like this.

Code Block

language	js
theme	DJango
title	Sensor2spinal-organ-sensor2/index.js
linenumbers	true

// Requirements and connection
const spinalCore = require('spinal-core-connectorjs');
const models = require('../spinal-models/models.js');

console.log("Configuration Environment not found, using default config");
process.env.SPINALHUB_PORT = 7777;
process.env.SPINALHUB_IP = "127.0.0.1";
process.env.SPINAL_USER_ID = 168;
process.env.SPINAL_PASSWORD = "JHGgcz45JKilmzknzelf65ddDadggftIO98P";

const conn = spinalCore.connect(`http://${process.env.SPINAL_USER_ID}:${process.env.SPINAL_PASSWORD}@${process.env.SPINALHUB_IP}:${process.env.SPINALHUB_PORT}/`);

// Gives random values to the hydrometry and temperature of a sensor
function simulate(sensor) {
  const hydro = Math.floor(Math.random() * 100);
  const degrees = Math.floor(Math.random() * 30);
  sensor.hydrometry.set(hydro);
  sensor.temperature.set(degrees);
  // Repeats every second
  setTimeout(() => {
    console.log(sensor.name.get() + ": data has changed");
    simulate(sensor);
  }, 1000);
};

// Finds a Sensor in the SensorList, if it doesn't exist, creates it
function getSensorById(list, id) {
  let item;

  for (let i = 0; i < list.sensors.length; i++) {
    if (list.sensors[i].id.get() === id) {
      item = list.sensors[i];
      break;
    }
  }
  if (typeof item === "undefined") {
    item = new models.SensorModel();
    item.id.set(id);
    item.name.set("sensor" + id);
    list.sensors.push(item);
  }
  return item;
}

// This function will be called if the list is successfully loaded
function onSuccess(list) {
  simulate(getSensorById(list, 1));
};

// This function will be called if the list cannot be loaded
function onFailure() {
  const list = new models.SensorListModel();
  const item = getSensorById(list, 1);

  spinalCore.store(conn, list, "List", () => {
    simulate(item);
  });
};

spinalCore.load(conn, "List", onSuccess, onFailure);

Panel

title	Launch efficiently your organs

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	4
	4

You might have noticed that running every organ independently is painful.

If you wonder why it’s so painful it’s because you are not supposed to do that :p.

In this part you will learn how to run you organs efficiently.

Take a look at .app.json.
add dependency to your organs.
1. name: The name they will be identified by pm2
2. script: The name of the script to be executed to launch the organ
3. cwd: The location of the script (relative to the root of the project)
run the commande pm2 restart launch.config.json.

Your .app.json should look like this:

Code Block

language	js
theme	DJango
linenumbers	true

{
  "apps": [
    {
      "name": "spinal-core-hub",
      "script": "spinalhub.js",
      "cwd": "./nerve-center/"
    },
    {
      "name": "sensor1",
      "script": "index.js",
      "cwd": "./spinal-organ-sensor1/"
    },
    {
      "name": "sensor2",
      "script": "index.js",
      "cwd": "./spinal-organ-sensor2/"
    }
  ]
}

pm2 will now show you sensor 1 and 2 along with spinal-core-hub.

Conclusion

In this tutorial you learned:

how to create complex models
how to organize your data coming from multiple organs
how to launch you your organs efficiently

This tutorial will be continued in Basic Automate Tutorial.

...

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Versions Compared

Old Version 50

New Version 51

Key

Table of contents

Quick navigation

System architecture:

Conclusion