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By Swagatam
#69862 Hi all,
How to solve fatal exception error in ESP8266 - 01?
Fatal exception (0):
epc1=0x40100003, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x40100003, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
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By philbowles
#69917 1. Show us the code!!!!!!!!!!

2. include any Serial output

3. Wiring diagram is always helpful...

No-one can possibly answer a question like that without additional information!
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By rzajac
#70071 You may try to use:

xtensa-lx106-elf-objdump -x app.out -d

and find 40100003 which will tell you where in your code the exception takes place.

The procedure is explained in ESP2866 book by Neil Kolban