i was allready working successfully with my ESP8266 ESP 01, but now I want to use the ESP WROOM 02 because of the FCC & CE Listing of this device. I use it for a shool final project where I have to connect it to an ATMEGA 328 and I need to be able to communicate by AT Commands. So everything was working quit well with ESP 01 but now, when I move to the WROOM device I'm getting problems. No successful return values!
I made a very simple test project for my arduino board where I can send and receive commands in my RealTerm Terminal on the PC, and the Ardunio is acting as "UART relay station". - It is working well when I switch back to ESP 01.
So I tested the buadrate of 115200 which is mentoid in the help file for AT commands but I always get only multiple 0xFF as return values.
I try to sent AT as my first test but it won't work.
Below a drawing of my wiring - maybe someone is so kind and help me.
Thank you, and best regards from Europe / Austria!
ESP 01 is't our official model,so i am not familiar with this model.About WROOM 02,So i don 't you how control it,you can consult this Doc.
http://www.espressif.com/sites/default/ ... eet_en.pdf
WROOM is littelbit complicated than ESP-nn board, but provide better performance.
Consult "ESP8266 SDK Getting Started Guide" chapter "2.2. ESP-WROOM-02" for correct wireing.
Do you need to pull up and pull down more pins.
For first try I recomend to use 330Ohm serial resistor for RXD and TXD.
According my experince TXD of MCU need to be connect TXD! pin of ESP-WROOM-02.
The ESP-WROOM-02 is delivered with AT firmware.
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