ESP8266 Community Forum

- Thu Oct 01, 2015 2:36 pm #30288 I don't have any pin name GPIO15
my module looks like this : http://www.ebay.com/itm/ESP8266-Serial-WIFI-Wireless-Transceiver-Module-Send-Receive-LWIP-AP-STA-A-/201205524305?hash=item2ed8c8a751

So in conclusion, the connections should be like this :

In flashing mode :

RXD --> TXD
GPIO0 --> GND
GPIO2 --> VCC
GND --> GND
VCC --> VCC (+3.3V)
RST --> VCC
CH_PD --> VCC
TXD --> RXD

While in normal operation mode :

RXD --> TXD
GPIO0 --> VCC
GPIO2 --> VCC
GND --> GND
VCC --> VCC (+3.3V)
RST --> VCC
CH_PD --> VCC
TXD --> RXD

Am I right ?

- Thu Oct 01, 2015 2:57 pm #30290 OK, I tried again with the connections I described in the last post and I also record it :

http://s1.postimg.org/gz1h1lvcv/Capture1.png

You can see that after flashing the module is working awesome (reply OK to AT and Version details to AT+GMR) but after one power cycle everything ruins and the module is not responding....

- Thu Oct 01, 2015 4:17 pm #30295 deleted - bad info!

Last edited by EspFan on Thu Oct 01, 2015 8:40 pm, edited 1 time in total.

- Thu Oct 01, 2015 4:24 pm #30296 I'm quoting from the "2A-ESP8266__IOT_SDK_User_Manual__EN_v1.4" document

page 6/25:

"Also set the jumper on the motherboard as MTDO:0, GPIO0:0, GPIO2:1; this causes the chip to
enter the download mode."

and on page 7/25 :

"Set the jumper on the motherboard as MTDO:0, GPIO0:1, GPIO2:1 for operation mode."