ESP8266 Community Forum

- Wed Jan 02, 2019 2:03 pm #79825 Good afternoon,

I'm having problems with a lot of ESP07 that I bought and would like some help.
I made a dedicated PCB with my circuit where I put the ESP07 and upload the skech with the Arduino IDE. Well, I bought some ESP07, I can upload the sketch on them, but ESP does nothing, It does not show anything on the serial monitor. Nor does the blink code work.

I have other ESP07 parts that I bought in China and they work normally.
Can anyone give me a hint of what it can be?
I already researched a lot on the net and found nothing.

The module with the Ai mark is what works.

Thank you.

- Wed Jan 02, 2019 5:04 pm #79830 One possible cause of this type of behaviour is that you have a batch of modules with a different type of flash memory connection which need a different flash mode.

Normally QIO is used but some modules need DIO or DOUT for a flash to program the memory correctly.

However, this is just a guess. You need to give us more details like the schematic, the powering scheme, and the code you are trying to use.

- Thu Jan 03, 2019 5:12 pm #79848

One possible cause of this type of behaviour is that you have a batch of modules with a different type of flash memory connection which need a different flash mode.

Normally QIO is used but some modules need DIO or DOUT for a flash to program the memory correctly.

However, this is just a guess. You need to give us more details like the schematic, the powering scheme, and the code you are trying to use.

Hi btidey,
Thank you for your help. Your guess was right, I changed to DOUT and worked.
Thanks again.