ESP8266 Arduino sketch + hardware documentation

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1 year 2 weeks ago #6386 by nu3e
Hi Lars,

Verify that your Wi-Fi credential strings (ssid and pswd) are correct for your home 2.4 GHz network.

As you probably know, address block 169.254.0.0/16 is reserved for IPv4 link-local addresses, which are automatically assigned to interfaces when other means of address assignment fail or are not available.

To determine the cause of your connection failure, I suggest  https://arduino-esp8266.readthedocs.io/en/latest/esp8266wifi/readme.html#diagnostics
  • Without changing the code, try "Enable Debugging in IDE" and see what appears on the Arduino serial monitor.
  • You can enable debugging programmatically by calling Serial.setDebugOutput(true) after Serial.begin(9600).
  • Printing the return value of WiFi.status() or calling WiFi.printDiag(Serial) should be helpful.
When I next update the code, I'll output connection diagnostics.

John

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1 year 2 weeks ago #6388 by Alterna
Above issue solved :-)
ESP8266 is not able to use Wifi channel 13 and 14!
My wifi modem was using channel 13

Best regrads from Lars, Denmark

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1 year 2 weeks ago #6389 by nu3e
Thanks for sharing your solution. I found this article which states channels 12, 13, and 14 don't work properly on the ESP8266:

https://olimex.wordpress.com/2021/12/10/avoid-wifi-channel-12-13-14-when-working-with-esp-devices/

I would never have discovered that, because here in the USA only channels 1-11 are allowed.

John

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