Created April 17, 2016 © GPL3+

2 way wifi comunication

this project can allow people to chat between two computers in realtime using wifi

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2 way wifi comunication

Things used in this project

Hardware components

Arduino MKR1000
Arduino MKR1000
you can use any 2 board that uses the WINC1500 wifi module and is arduino ide compatible
Adafruit Feather M0 WiFi - ATSAMD21 + ATWINC1500
this board is optional if you don't have access to the other two boards but you will have to slightly change the code to accommodate this board
Arduino Wifi Shield 101
Arduino Wifi Shield 101
you can use any board that uses the WINC1500 wifi module and is arduino ide compatible

Software apps and online services

Arduino IDE
Arduino IDE


Read more



there is no schematic just plugin your board into your computer(s)


wifichatserver made by

to operate this code you need to insert your ssid and its network password where it asks for it in the code then upload to your board and open your serial monitor. there you will get a message that reads "connecting to ssid:(right here should be your ssid) ." wait until you get a message that contains the tcp port, the boards ip address, and other things. But if the connecting to ssid message continues to repeat several times, your ssid or password is probably incorrect. also this code only works with the arduno mkr1000 or with the arduino 101 shield
 Chat  Server

 A simple server that distributes any incoming messages to all
 connected clients.  To use telnet to  your device's IP address and type.
 You can see the client's input in the serial monitor as well.

 This example is written for a network using WPA encryption. For
 WEP or WPA, change the Wifi.begin() call accordingly.

 * WiFi shield attached

 created 18 Dec 2009
 by David A. Mellis
 modified 31 May 2012
 by Tom Igoe


#include <SPI.h>
#include <WiFi101.h>

char ssid[] = "yourNetwork"; //  your network SSID (name)
char pass[] = "secretPassword";    // your network password (use for WPA, or use as key for WEP)

int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(23);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {
  //Initialize serial and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);

  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:

  // start the server:
  // you're connected now, so print out the status:

void loop() {
  // wait for a new client:
  WiFiClient client = server.available();

  // when the client sends the first byte, say hello:
  if (client) {
    if (!alreadyConnected) {
      // clead out the input buffer:
      Serial.println("We have a new client");
      client.println("Hello, client!");
      alreadyConnected = true;

    if (client.available() > 0) {
      // read the bytes incoming from the client:
      char thisChar =;
      // echo the bytes back to the client:
      // echo the bytes to the server as well:

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.println(" dBm");




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