Arduino UNO R4 Wi-Fi password connection issues

The Arduino UNO R4 Wi-Fi is a great addition to the Arduino family. A fun little board to play with.

The Arduino UNO R4 Wi-Fi could not connect to my router. It turns out that the issue was related to the Wi-Fi password I was using. After spending quite a lot of time trying to find the cause of this issue. My Wi-Fi password was 63 characters long and included some special characters.

The symptoms were that when the sample program SimpleWebServerWifi was running, the Arduino was trying to connect to my router without success endlessly. Also, no trace of the attempts were to be found into the router logs.

The issue was with the special characters. I found out that commas (,) cannot be used within the Wi-Fi password. I don’t know if any other special characters cause similar issues, but dollar signs ($) and semicolons (;) works.

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