ESP 12 - Strange behaviour

[parmar7725274]

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.

[Espressif_Kelly]

Hi，

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.

Thanks.