Remote logging with Arduino and Node.js

URL

In this tutorial, the author will show you how to save sensor data remotely with Arduino and Node.js. We will accomplish this with Arduino, Ethernet Shield and computer/server.
The basic idea is to set up UDP stream from arduino to remote computer where we have Node.js udp server writing data into a file.

Arduino setup

Put the Ethernet shield on the Arduino and plug in the Ethernet cable from your network.
Connect arduino to your computer with usb cable and plug in additional 9V power adapter to make sure that shield will have enough power.
You are all set and should be looking at the same thing as seen on the photo.
(Photo is obviously missing a sensor of some-kind connected to arduino.)

For more detail about Arduino sketch, Node.js UDP server setting and etc, visit the author’s blog “FRANKIE.NET”

Code

#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>

byte arduinoMac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress arduinoIP(192, 168, 1, 177); // desired IP for Arduino
unsigned int arduinoPort = 8888;      // port of Arduino

IPAddress receiverIP(192, 168, 1, 135); // IP of udp packets receiver
unsigned int receiverPort = 6000;      // port to listen on my PC

EthernetUDP Udp;

int sensorPin = A0; //define sensor pin
int sensorValue;

void setup() {
  Ethernet.begin(arduinoMac,arduinoIP);
  Udp.begin(arduinoPort);
}

void loop() {
  sensorValue = analogRead(sensorPin);//read sensor value from 0 to 1023 
  byte valueInBytes[2] = {lowByte(sensorValue), highByte(sensorValue)}; //convert it to byte array
  
  Udp.beginPacket(receiverIP, receiverPort); //start udp packet
  Udp.write(valueInBytes, 2); //write sensor data to udp packet
  Udp.endPacket(); // end packet

  delay(1000);
}