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Reading Arduino data with Node.js

index.js

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+var SerialPort = require('serialport'); // Serialport require
+var options = {
+    baudRate:9600,
+    parity : 'none',
+    delay : 1000}; // Port options for variable
+var port = new SerialPort('COM6', options); // Port definition with directory and options
+const readLine = SerialPort.parsers.Readline; // Describes reading data line by line
+var portParser = port.pipe(new readLine({delimiter: ';'})); // Delimiter with ';' and pipe variable
+
+port.write('main screen turn on', function(err)
+{
+    if (err) {
+        return console.log('Write Error : ', err.message);
+    }
+    console.log('Data Ready For Read');
+});
+
+port.on('open',function ()
+{
+    console.log('Port Open');
+});
+
+port.on('error', function(err)
+{
+    console.log('Error : ', err.message);
+});
+
+
+port.on('data',function (data)
+{
+    console.log (data.toString());
+});
+
+function readData() // Data read and checked function
+{
+    portParser.on('data', function (data)
+    {
+        if (data.toString()==null)
+        {
+            console.log("Null");
+        }
+        console.log('Data : ', data.toString());
+        console.log(data.toString().split(",")); //  The data is separated from commas and becomes an array
+        if (data.toString().length!==7)
+            //In the example arduino code, there are 7 types of data
+            //So it is being controlled by seven
+        {
+            console.log("Missing Data");
+        }
+    });
+}
+
+// Converting to JSON
+function toJSON (data)
+{
+    var json = JSON.stringify(data);
+    console.log(json); //json
+    console.log(typeof json); //string
+}
+
+readData();