ESP8266 Community Forum

Got the Arduino + ESP8266 working with the sample HelloWebServer code. Since my target is a "plug-and-forget" standalone WiFi sensor, I don't need serial output. So I commented out all code containing Serial*, from the init to all prints.

Compiled, uploaded and ... the ESP8266 doesn't boot unless I do connect something to the hardware serial. If I leave it floating the code hangs to what is the beginning of setup(), since it doesn't log into the AP.

If I add a jumper between RX and TX lines of the 8266, everything boots up and works.
If I connect the serial adapter then I see some boot gibberish and then no output, confirming the latest sketch is running.

Is this normal?

Thanks.

Doesn't sound right to me. Maybe if we could see some of your code it might help.

Maybe the rx like left floating causes it to think it is constantly receiving data and locks up the esp8266 as a result? I've had similar issues on other platforms like that.

I am seeing the same thing.

I am using a ESP-01.