Why can my Arduino Uno Wi-Fi R2 connect to my iPhone (with personal hotspot enabled), but not to my Wi-Fi router?

Sketch used:

/*
  Web client

 This sketch connects to a website (http://www.google.com)
 using the WiFi module.

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

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

 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 31 May 2012
 by Tom Igoe
 */


#include <SPI.h>
#include <WiFiNINA.h>

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // 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;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
char server[] = "www.google.com";    // name address for Google (using DNS)

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiClient client;

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 < WIFI_FIRMWARE_LATEST_VERSION) {
    Serial.println("Please upgrade the firmware");
  }

  // attempt to connect to WiFi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(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:
    delay(10000);
  }
  Serial.println("Connected to WiFi");
  printWifiStatus();

  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected to server");
    // Make a HTTP request:
    client.println("GET /search?q=arduino HTTP/1.1");
    client.println("Host: www.google.com");
    client.println("Connection: close");
    client.println();
  }
}

void loop() {
  // if there are incoming bytes available
  // from the server, read them and print them:
  while (client.available()) {
    char c = client.read();
    Serial.write(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting from server.");
    client.stop();

    // do nothing forevermore:
    while (true);
  }
}


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

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

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

iPhone model: SE 2nd generation.
Router model: NVG443B.

Router status summary:

Status - Summary

Auto Refresh 106

WAN Summary

WAN Link: Up
WAN Connection: Connected
Link Type: ADSL2+ Bonded
Connection Type: PPP
Username: [redacted]
Link Speed: 13952 / 1206kbps
WAN IPv4 Address: 50.44.10.217
WAN Subnet Mask: 255.255.255.255
WAN Default Gateway: 192.183.84.1
WAN MAC Address: a0:68:7e:09:71:01
DNS Server 1: 74.40.74.40/ dns1.anycast.frontiernet.net
DNS Server 2: 74.40.74.41/ dns2.anycast.frontiernet.net

Wireless Summary

Total Control Wireless: Disabled
2.4 GHz:
Radio: Enabled
Primary SSID: Enabled
Network Name: Sydes_2.4_GHz
Encryption: WPA2
Guest SSID: Disabled
Network Name: Guest0912
Encryption: WPA2
5 GHz:
Radio: Enabled
Primary SSID: Enabled
Network Name: Sydes_5_GHz
Encryption: WPA2
Guest SSID: Disabled
Network Name: Guest0912_5G
Encryption: WPA2

Private LAN Summary

IP Address: 192.168.254.254
Subnet Mask: 255.255.255.0
DHCP: Enabled
IPv6 Status: Disabled

Public LAN Summary

Public LAN: Disabled

Firewall Summary

Level: Off
Packet Filtering: Enabled
Port Forwarding: Disabled
DMZ: Disabled
UPnP: Enabled
NAT: Enabled
Service Blocking: Disabled
Website Blocking: Disabled
ALG Passthrough: Enabled

Gateway Summary

Model: NVG443B
Firmware: 9.3.0h3d36
Serial Number: [redacted]
Time: 16:22:28 PM
Time Zone: Central
Uptime: 00:07:23:25:32

Hi @robert_sydes. What do you SECRET_SSID set to in your "Secrets" tab?

And how long is the password?

(Coming back to this after taking a break for a few days) I realized that I had left the caps lock on when inputing the SSID; also, the Arduino's Wi-Fi module doesn't seem to have 5GHz capabilities. Problem solved.

LOL :slight_smile:

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