Zobrazenie zdroja stránky Thingsboard.io

1. Arduino so senzorom vysiela data

Pozri program na cvičení č. 2: [[MEMS cvičenie 3#Vysielač - Arduino]]

2. Processing prijíma data zo sériovej linky

Pozri program na cvičení s Processingom: [[MEMS cvičenie 3#Prijímač - Processing]]

3. Ak funguje (1) a (2), doplňte prenos do ThingsBoard.IO

Pozri program na cvičení MQTT: [[Protokol MQTT]]


Vzorový príklad

<source lang="cpp">
import processing.serial.*;
import mqtt.*;

int adcValue = 0;        // value received from Serial 
String Unit="[-]";       // Unicode codes may be entered as well
 
Serial myPort;
PFont Segment, Units; 


MQTTClient client;
JSONObject message;
float temperature = 0.0;
int status = 0;

void setup() 
{
  message = new JSONObject(); 
  client = new MQTTClient(this);
  client.connect("mqtt://dOVph0fe2HybffoMHjN3@demo.thingsboard.io");
  
  size(480, 180);         // Size of the window
  Segment = createFont("Segment7", 150);  // Assign fonts and size 
  Units = createFont("Arial", 40);
  textFont(Segment);
  textAlign(RIGHT);        // Text align 
  fill(250,250,0);         // Font color is yellow = red + green

  println(Serial.list());    // List all the available serial ports
  // Then open the port  you're using, my is the first, i.e. '0'
   myPort = new Serial(this, Serial.list()[1], 9600);
 // don't generate a serialEvent() unless you get a newline character:
   myPort.bufferUntil('\n');
}


void draw() 
{
   
  background(0,0,0);   // set the background color black

  textFont(Segment);
  text(adcValue, 400, 150);
  
  textFont(Units);
  text(Unit,465,65);

}

void serialEvent(Serial myPort) 
{
 String inString = myPort.readStringUntil('\n');    // get the ASCII string:
 if (inString != null) 
    {
     inString = trim(inString);     // trim off any whitespace
     adcValue = int(inString);      // convert into an integer
     adcValue =int(map(adcValue, 0, 1023, 0, 1023));  // possible range adjusting
 
     message.setFloat("XXXY-Temp", adcValue);
     println(message.toString());
     client.publish("v1/devices/me/telemetry", message.toString());
    }

}
 
void messageReceived(String topic, byte[] payload) 
{
  println("new message: " + topic + " - " + new String(payload));
}


void clientConnected() 
{
  println("client connected");
}

void connectionLost() 
{
  println("connection lost");
}

</source>