Cheapest Way to Connect Arduino to Internet

Cheapest way to connect Arduino to internet

Shields here costly! and this bothers me a lot. It's impossible to build your own automation system without shields.
I found some articles on internet but for my bad luck non of them worked on my routers. All articles were talking about a specific router. I spent a year to figure it out and finally everything worked great. In this tutorial I will show you how to connect your Arduino to any Router without any shields through Serial Port. "Not USB"

What you need!

Arduino
Router
3 wires that's it

But before I start Just a moment of peace for the Holocaust that I made in my lab before I figure it out.

Cisco e900, TP-Link, UBNT, Motorolla RIP :')

You can connect your Arduino to 3G/4G portable router too like this one

Lets start..

Step 1: DD-WRT Router Firmwere

It's an open source firmware, open this link and search on your router model to download your firmware. after that just follow these steps:

Connect your Router to your PC over Ethernet DON'T use WiFi connections.
Upload your firmware and just wait until your router restart normally.
Open any browser and type the default IP address 192.168.1.1
Make sure there is internet on your router.

DO NOT attempt to reset or power cycle the router while it is still in the process of upgrading!
Wait a couple of minutes after upgrade is complete.

Note: If you can't have internet on you router after entering your setting, In this case your router have Dirty NVRAM

Your old firmware files still there, make 30-30-30 Hard reset.

The following procedure will clear out the NVRAM and set dd-wrt back to default values:

With the unit powered on, press and hold the reset button on back of unit for 30 seconds.
Without releasing the reset button, unplug the unit and hold reset for another 30 seconds
Plug the unit back in STILL holding the reset button a final 30 seconds

Step 2: Wire Connections

Most Routers have Serial ports, Open your Router and search on these ports, usually 4/5 pins, If you couldn't find them "They are separate" just google it :)

Arduino Router

TX RX

RX TX

GND GND

NOTE: You can't upload any code to your Arduino if you connect TX-RX to your router, make them removable.

Step 3: First Test "Connections"

To be sure your wires is correct Follow these steps:

Upload this code to your Arduino "empty code"
```
void setup(){ }
void loop(){ }
```

Open your Serial Monitor from Arduino IDE and choose the higher Baud Rate 115200

If you could see weird charterers your connections work great, But we still not have the same baud Rate.

Step 4: Second Test Baud Rate

Both devices "Arduino, Router" Must have the same Baud speed.

open any browser Then enter this IP address "192.168.1.1"
Navigate to Administrations then Commands, Put This code below inside the white box

echo "hello world" > /div/tts/0 115200

Open your Serial Monitor again from Arduino IDE and choose the same Baud Rate.

echo it's a command like printIn in C language, tss the serial port and 115200 the baud rate.

NOTE: some routers have two serial ports, If that doesn't work change it from "0" to "1"

If you want show bandwidth/clients/QOS just reset your router all the data will be shown in Serial Monitor.

Check attached file if you want add LCD 16X2 to your router.

Step 5: Coding

There is two type of communications:

Router to Arduino
Arduino to Router

For the first type:

just upload this code to your Arduino, That's will turn ON your PIN13 LED.

void setup () {
  pinMode(13,OUTPUT);
  Serial.begin(115200);
}
void loop () {
  int val;
        val=Serial.read();
      if(val=='1') {digitalWrite(13,HIGH); } 
   }
  }
 }

From your Router Run This command.

echo "1" > /div/tts/0 115200

That's it, you can Turn ON your LED at PIN13, add other code line to turn it OFF by using"0" this time.

For the second type:

Each time your Arduino start communicate with your Router, Your router will ask about username and password, so this is the base of your code:

// DD-WRT user-ID,password,serial-speed settings
#define USER_ID "root"
#define PASSWD "XXXX"
#define SERIAL_SPEED 115200
//Server IP and TCP-Port Listening settings
#define SERVER "192.168.X.XXX"
#define PORT "5555"

Be sure your router not blocked your port "5555"

Simple like that! There is allot of apps at Android store for SSH commands, to control
your Arduino over internet, anyway in the next tutorial I will show you how you can build your own webpage or VB.net program, If you have any question, feel free to ask.

My Last project 4KM wireless for my Arduino :)

Introduction: Cheapest Way to Connect Arduino to Internet