Fatal Exception Error on ESP8266 + Arduino When I was trying to blink an LED using ESP8266, I had an issue with it. After successfully uploaded the code (https://diyhacking.com/esp8266-tutorial/), the blue LED stayed on &amp; when I opened the serial monitor using Arduino IDE 1.6.12, I only saw "Fatal Exception" error (showed in the picture). I couldn't see how the code works and the worst thing was I couldn't even try the AT command.

The connections:

Arduino &lt;--->   ESP8266 (ESP-07)

Tx  &lt;---&gt;   Tx
Rx  &lt;---&gt;   Rx
GND &lt;---&gt;   GPIO0
GND &lt;---&gt;   GND
3.3v&lt;---&gt;   CH_PD
3.3v&lt;---&gt;   VCC
            GPIO2 -&gt; LED 


I have been trying to troubleshoot this issue but haven't got the solution yet. I am afraid there is an issue with the firmware or the worst situation, I spoiled my ESP8266.
Looking at your serial monitor window it shows "Geuino Uno". I think you forgot to change the target of the compiler to "Generic ESP8266" like shown in the how-to and you probably uploaded bad code to your module.