ESP 12 - Strange behaviour

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Joined: Wed Jun 03, 2015 1:20 pm

ESP 12 - Strange behaviour

Postby parmar7725274 » Sat Dec 05, 2015 1:13 pm

Hi All,

I have ESP 12q module when I apply power without connecting Tx, Rx pin to USB-SERIAL connector it won't start but If I connect tx, rx pin to USB-SERIAL connector and apply power it starts and works normally. I'm using 3.3v external power source rather than USB power source from laptop. I have wired it according to attached diagram. I have two ESP 12q modules and both giving same problem.

Any one have idea whats is wrong ?

Thanks & Regards,
Prakash P.
esp 12q.png

Posts: 140
Joined: Mon Oct 27, 2014 10:40 am

Re: ESP 12 - Strange behaviour

Postby Espressif_Kelly » Wed May 18, 2016 10:58 am


So sorry for missing your post.

Have you resolved your problem?

Whether uart interface has been connected to USB-SERIAL connector or not, it won't affect the working of ESP-12 module.

UART interface is only for uart communication or debug.

BTW, how you define that if the ESP-12 module works normally.


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