ESP8266 Community Forum

- Wed Feb 17, 2016 11:20 am #41290 I have some trouble with my ESP-07.

I have ESP-01 and ESP-07. When I try to flash the ESP-01, it works perfecly. But when I try to flash ESP-07 using the same USB2Serial hardware, it doesn't.

I have:
Reset floating
CH_PD to 3.3v
Vcc to 3.3v
GND to GND
TXD to RX
RXD to TX
GPIO0 and GPIO15 to GND

I'm using an Arduino board to covnert USB to Serial and a level converter to TX and RX.
My power supply can give 3A.

The message I recieve is:
warning: espcomm_sync failed
error: espcomm_open failed

I do reset the module after turn it on using a wire to GND

What am I missing?

PS: Tried with an FTDI and got the same message.

- Wed Feb 17, 2016 12:56 pm #41293 Got a new message

warning: espcomm_send_command: wrong direction/command: 0x01 0x00, expected 0x01 0x08
warning: espcomm_send_command: wrong direction/command: 0x01 0x00, expected 0x01 0x08
Uploading 219968 bytes from C:\Users\TZKEJS~1\AppData\Local\Temp\build2009487715364150281.tmp/BKServer.cpp.bin to flash at 0x00000000
warning: espcomm_send_command: didn't receive command response
warning: espcomm_send_command(FLASH_DOWNLOAD_BEGIN) failed

- Wed Feb 17, 2016 6:02 pm #41321 Hi, on the ESP8266-01 (ESP01) GPIO 15 isn't broken out & is connected to ground (I think by a resistor). This is required for the correct boot / flash to occure. On the ESP8266-07 (ESP07) GPIO 15 is broken out and you are required to ground it yourself (I'd use 1K ->10K). Once the boot / flash has taken place you can then use the pin as a normal GPIO.

- Thu Feb 18, 2016 9:00 am #41367 I have GPIO15 to GND.

When I try to flash, the blue LED on the ESP-07 blinks at the same moment as RX LED at arduino board.