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index.js

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+var path = require('path');
+var app = require('express')();
+var http = require('http').Server(app);
+var io = require('socket.io')(http);
+
+
+
+const cors = require('cors')
+app.use(cors());
+
+io.on('connection', s => {
+      console.error('socket connection');
+
+   io.on('data', function(s) {
+        console.log('Got', s);
+    })
+
+});
+
+
+http.listen(5000, () => console.error('listening on http://localhost:5000/'));
+console.error('socket.io example');

seriaport.ino

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+int analogPin = A3; 
+                    
+int meas = 0;  
+
+void setup() {
+  Serial.begin(9600);           //  setup serial
+}
+
+void loop() 
+  {
+ meas = analogRead(analogPin);  // read the input pin
+ 
+  if (Serial.available())
+    {
+        if (Serial.read() == '1')
+        {
+  Serial.println(meas);          // debug value
+    }
+    } 
+    }
+    

stratos.py

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+import serial
+from datetime import datetime
+from time import sleep
+import socketio
+
+sio = socketio.Client()
+now = datetime.now()
+
+ser = serial.Serial('/dev/ttyACM0', 9600, timeout=1)
+ser.flush()
+
+
+@sio.event
+def connect():
+    print('connection established')
+
+
+flag = 0
+while True:
+    if flag != 1:
+        sio.connect('http://localhost:5000/')
+        flag += 1
+    if ser.in_waiting > 0:
+        data = ser.readline().decode('utf-8').rstrip()
+        print(data)
+        sio.emit('data', data)
+        print(now.strftime("%Y-%m-%d %H:%M"))
+
+
+
+   
+
+       
+      

thermokrasia.ino

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+//TMP36 Pin Variables
+int sensorPin = 0; //the analog pin the TMP36's Vout (sense) pin is connected to
+                        //the resolution is 10 mV / degree centigrade with a
+                        //500 mV offset to allow for negative temperatures
+ 
+/*
+ * setup() - this function runs once when you turn your Arduino on
+ * We initialize the serial connection with the computer
+ */
+void setup()
+{
+  Serial.begin(9600);  //Start the serial connection with the computer
+                       //to view the result open the serial monitor 
+}
+ 
+void loop()                     // run over and over again
+{
+ //getting the voltage reading from the temperature sensor
+ int reading = analogRead(sensorPin);  
+ 
+ // converting that reading to voltage, for 3.3v arduino use 3.3
+ float voltage = reading * 5.0;
+ voltage /= 1024.0; 
+ 
+ // print out the voltage
+ Serial.print(voltage); Serial.println(" volts");
+ 
+ // now print out the temperature
+ float temperatureC = (voltage - 0.5) * 100 ;  //converting from 10 mv per degree wit 500 mV offset
+                                               //to degrees ((voltage - 500mV) times 100)
+ Serial.print(temperatureC); 
+ Serial.println(" degrees C");
+
+ 
+ delay(1000);                                     //waiting a second
+}