Arduino UNO r4 WIFI wont connect to any routers

Hardware UNO R4 UNO R4 WiFi
1

I have been trying to get two uno r4 boards to talk with each other but i cant even get one of them to connect to any routers, i have tried my home wifi and mobile hotspot neither of which have worked, the code just continues printing a "." when it hasnt connected yet.

#include <WiFi.h>
#include <WiFiServer.h>

char* ssid = "iphone";
char* password = "abcdefgh";

WiFiServer server(80);

void setup() {
  Serial.begin(9600);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("Connected to Wi-Fi");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}

void loop() {
  WiFiClient client = server.available();
  if (client) {
    Serial.println("Client connected");
    while (client.connected()) {
      if (client.available()) {
        String data = client.readStringUntil('\n');
        Serial.print("Received data: ");
        Serial.println(data);
      }
    }
    client.stop();
    Serial.println("Client disconnected");
  }
}
2

Check if your Wifi is set to only work on 5 Ghz channels. If so, also enable the 2.4 Ghz channels and then try to connect.

R4 is not capable of 5Ghz wifi.

1 Like
3

Hey, I'm pretty sure that when mobile hotspot is in maximize efficiency mode it will be in 2.4 Ghz but just incase ill check my home internet and retry. Thanks

4

So the router is in 2.4 Ghz mode and I'm still encountering the same issue, do you have any other possible problems.

5

You might be able to make progress if you print the actual status returned so you can fix that specific part.

6

You must use the WiFiS3 library instead of WiFi.

https://docs.arduino.cc/tutorials/uno-r4-wifi/wifi-examples/

And check that WiFiServer is compatible with the ESP32-S3.

Regards

7

Man your a legend, thanks so much, I didnt realise that there was an S3 variant of the wifi library. Everything works now.

1 Like
8

I just googled "Uno R4 wifi library", no big deal either. :wink: