ESP8266 Community Forum

- Wed Feb 11, 2015 12:45 pm #9487 Hi Arnie,

unfortunately i don't have any decoupling capacitors i also have checked the correct pins and the output voltage of my usb2serial adapter and my multimeter showed 3.34v. This was the first thing i have checked

i simply guess it's defect, so i have to wait for the package from china, which should arrive in about 2 weeks

thank you all for your help! Once i've received the new modules, i will update this thread.

- Wed Feb 11, 2015 4:26 pm #9510 No luck if you flash the firmware supplied with ESPFlasher without touching any settings?

I had some problems which was that i couldn't send any commands. This had to do with the "Implicit CR in every LF" (and vice versa) setting in PuTTY. "termite 3.1" worked out of the box and way better!

Also it's easy do miss the "start screen" if you use your USB->Serial adapter for powering the module and then restart by unplugging and plugging the USB.
It's easy to miss the text and think it's dead - especially (my case) when it won't respond on the commands.

- Thu Feb 12, 2015 2:10 am #9531

i also have checked the correct pins and the output voltage of my usb2serial adapter and my multimeter showed 3.34v. This was the first thing i have checked

Just to be sure I don´t misunderstand you: Is this the Rx/Tx levels you have checked, or just the Vcc output? I have read that some adapters deliver 5V on the Tx/Rx even when strapped to 3.3V. I do not know if this works, but I read somewhere a suggestion to connext Tx and Rx lines together on the adapter (you owill not kill it), then measure that point with a voltmeter. It will show signal Vcc.

- Tue Feb 17, 2015 4:18 pm #10056 Hello,

sorry, i have missed the new posts here

today, a new ESP arrived (reseller has sent me a new one for free) and i've got the same problem.

yes, i have checked the vcc AND the TX output of my converter, both showed 3.3v

BUT:
i finally got a response from my ESP, i could communicate. But it's not very stable. I have to power cycle the ESP for about 10 times until i can talk to the module. And when i'm pressing the reset-button (on my breadboard) or entering AT+RST, there's hardly a chance to communicate again.

When resetting, i don't see the "ready" or any other readable text, only some random data.

Now i have 2 modules, where SOMETIMES i can communicate The same problem on both modules. I do not change any configuration/client/wiring ..

I also have tried to power it with an Arduino Mega 2560, but here's the same problem. I will try to use an external 3.3v tomorrow