ESP8266 Community Forum

- Tue Aug 11, 2015 7:03 am #25648 Hi.

I made a Board where I tried to send some AT Commands from MCU UART to ESP-02 Module UART. Attached is the Schematic of my Board.

I am facing problem that ESP-02 not responding the AT Commands. Please advise if I missed to add anything in my Schematic or Command to enable Response of ESP-02. Below commands I tried.

AT+AT\r\n
AT+GMR\r\n
AT+CWMODE=1\r\n
AT+CWLAP\r\n

I tried several Baud rates 9600, 115200, 57600 but still no luck.

Looking forward your suggestion.

Thank you.

Regards.

Attachments

- Tue Aug 11, 2015 11:07 am #25681 Hello,

You are missing a little bit of stuff on your hardware drawing.
Definitely you need pin 3 EN set to HIGH. You also could pull up the RST pin and use a switch to ground it to reset the chip.
You also, since you WILL reflash this thing need a pull-up and a switch to ground on GPIO0.

I just got mine to work but even after I got it talking i still had to reflash it to the latest? (well, 0.9.5) firmware to get it to really talk.

Vlad

- Tue Aug 11, 2015 11:18 am #25683 According to https://github.com/esp8266/esp8266-wiki ... ot-Process, you need to pull down GPIO15, and pull up both GPIO2/GPIO0 for normal EXEC mode. RES also need to be pulled-up.

- Tue Aug 11, 2015 11:19 am #25684 Hi Vlad.

Thanks for responding. Some more ques.

- PIN3 of the Module is TxD. I need to Pull-Up it to HIGH as well to ENABLE?

- Actually right now I don't want to flash the Module. Is'nt it pre-loaded with Firmware?

- Whats the default Baud rate of ESP-02 Module?

Regards.