Scan Networks
This example scans for 802.11b/g network with one of the boards that support this library. Your Arduino Software (IDE) serial monitor will print out information about the board and the networks it can see. It will not connect to a network.
Hardware Required
Circuit
The WiFi module is integrated on your board and you don't need any special circuitry to get this tutorial to work.
Arduino MKR WiFi 1010
Arduino MKR VIDOR 4000
Arduino UNO WiFi Rev.2
Please note: these three boards use dedicated pins to communicate and select the WiFi module, therefore you have no restriction in the usage of the available digital pins connected to the header pins.
Code
Open your Arduino Software (IDE) serial monitor to view the networks the WiFi module can see. The shield may not see as many networks as your computer.
/*
This example prints the board's MAC address, and
scans for available Wifi networks using the NINA module.
Every ten seconds, it scans again. It doesn't actually
connect to any network, so no encryption scheme is specified.
Circuit:
* Board with NINA module (Arduino MKR WiFi 1010, MKR VIDOR 4000 and UNO WiFi Rev.2)
created 13 July 2010
by dlf (Metodo2 srl)
modified 21 Junn 2012
by Tom Igoe and Jaymes Dec
*/
#include <SPI.h>
#include <WiFiNINA.h>
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < "1.0.0") {
Serial.println("Please upgrade the firmware");
}
// print your MAC address:
byte mac[6];
WiFi.macAddress(mac);
Serial.print("MAC: ");
printMacAddress(mac);
}
void loop() {
// scan for existing networks:
Serial.println("Scanning available networks...");
listNetworks();
delay(10000);
}
void listNetworks() {
// scan for nearby networks:
Serial.println("** Scan Networks **");
int numSsid = WiFi.scanNetworks();
if (numSsid == -1) {
Serial.println("Couldn't get a wifi connection");
while (true);
}
// print the list of networks seen:
Serial.print("number of available networks:");
Serial.println(numSsid);
// print the network number and name for each network found:
for (int thisNet = 0; thisNet < numSsid; thisNet++) {
Serial.print(thisNet);
Serial.print(") ");
Serial.print(WiFi.SSID(thisNet));
Serial.print("\tSignal: ");
Serial.print(WiFi.RSSI(thisNet));
Serial.print(" dBm");
Serial.print("\tEncryption: ");
printEncryptionType(WiFi.encryptionType(thisNet));
}
}
void printEncryptionType(int thisType) {
// read the encryption type and print out the name:
switch (thisType) {
case ENC_TYPE_WEP:
Serial.println("WEP");
break;
case ENC_TYPE_TKIP:
Serial.println("WPA");
break;
case ENC_TYPE_CCMP:
Serial.println("WPA2");
break;
case ENC_TYPE_NONE:
Serial.println("None");
break;
case ENC_TYPE_AUTO:
Serial.println("Auto");
break;
case ENC_TYPE_UNKNOWN:
default:
Serial.println("Unknown");
break;
}
}
void printMacAddress(byte mac[]) {
for (int i = 5; i >= 0; i--) {
if (mac[i] < 16) {
Serial.print("0");
}
Serial.print(mac[i], HEX);
if (i > 0) {
Serial.print(":");
}
}
Serial.println();
}
This example prints the board's MAC address, and
scans for available Wifi networks using the NINA module.
Every ten seconds, it scans again. It doesn't actually
connect to any network, so no encryption scheme is specified.
Circuit:
* Board with NINA module (Arduino MKR WiFi 1010, MKR VIDOR 4000 and UNO WiFi Rev.2)
created 13 July 2010
by dlf (Metodo2 srl)
modified 21 Junn 2012
by Tom Igoe and Jaymes Dec
*/
#include <SPI.h>
#include <WiFiNINA.h>
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < "1.0.0") {
Serial.println("Please upgrade the firmware");
}
// print your MAC address:
byte mac[6];
WiFi.macAddress(mac);
Serial.print("MAC: ");
printMacAddress(mac);
}
void loop() {
// scan for existing networks:
Serial.println("Scanning available networks...");
listNetworks();
delay(10000);
}
void listNetworks() {
// scan for nearby networks:
Serial.println("** Scan Networks **");
int numSsid = WiFi.scanNetworks();
if (numSsid == -1) {
Serial.println("Couldn't get a wifi connection");
while (true);
}
// print the list of networks seen:
Serial.print("number of available networks:");
Serial.println(numSsid);
// print the network number and name for each network found:
for (int thisNet = 0; thisNet < numSsid; thisNet++) {
Serial.print(thisNet);
Serial.print(") ");
Serial.print(WiFi.SSID(thisNet));
Serial.print("\tSignal: ");
Serial.print(WiFi.RSSI(thisNet));
Serial.print(" dBm");
Serial.print("\tEncryption: ");
printEncryptionType(WiFi.encryptionType(thisNet));
}
}
void printEncryptionType(int thisType) {
// read the encryption type and print out the name:
switch (thisType) {
case ENC_TYPE_WEP:
Serial.println("WEP");
break;
case ENC_TYPE_TKIP:
Serial.println("WPA");
break;
case ENC_TYPE_CCMP:
Serial.println("WPA2");
break;
case ENC_TYPE_NONE:
Serial.println("None");
break;
case ENC_TYPE_AUTO:
Serial.println("Auto");
break;
case ENC_TYPE_UNKNOWN:
default:
Serial.println("Unknown");
break;
}
}
void printMacAddress(byte mac[]) {
for (int i = 5; i >= 0; i--) {
if (mac[i] < 16) {
Serial.print("0");
}
Serial.print(mac[i], HEX);
if (i > 0) {
Serial.print(":");
}
}
Serial.println();
}
See Also:
- WiFi NINA library – Your reference for the WiFi NINA Library.
- Arduino MKR WiFi 1010 – Product details for the Arduino MKR WiFi 1010 board.
- Arduino MKR VIDOR 4000 – Product details for the Arduino MKR VIDOR 4000 board.
- Arduino UNO WiFi Rev.2 – Product details for the Arduino UNO WiFi Rev.2 board.
- AP_SimpleWebServer : A simple web server to manage a LED with AP feature
- ConnectNoEncryption : Demonstrates how to connect to an open network
- ConnectWithWEP : Demonstrates how to connect to a network that is encrypted with WEP
- ConnectWithWPA : Demonstrates how to connect to a network that is encrypted with WPA2 Personal
- ScanNetworksAdwanced : Displays all WiFi networks, also the encrypted ones, in range
- SimpleWebServerWiFi : A simple web server to manage a LED
- WiFiChatServer : Set up a simple chat server
- WiFiPing : Demonstrates how to ping a website or IP address
- WiFiSSLClient : Connect to a website using SSL
- UdpNTPClient : Query a Network Time Protocol (NTP) server using UDP
- WiFiUdpSendReceiveString : Send and receive a UDP string
- WiFiWebClient : Connect to a remote webserver
- WiFiWebClientRepeating : Make repeated HTTP calls to a webserver
- WiFiWebServer : Serve a webpage from the WiFi module
Last revision 2018/07/12 by SM
